QM48S40033-NS00-G - Power-One - Datasheet.Directory

NOV 13, 2006 revised to MAR 28, 2007 Page 1 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

The QmaXTM Series of high current single output DC-DC

converters from Power-One sets new standards for thermal

performance and power density in the quarter brick package.

The 40A QM48S converters of the QmaXTM Series provide

thermal performance in high temperature environments that

is comparable to or exceeds the industry’s leading 40A half

bricks. This is accomplished through the use of patent pend-

ing circuit, packaging and processing techniques to achieve

ultra-high efficiency, excellent thermal management and a

very low body profile.

The QM48S40 converters have a power density of up to

130 W/in3, more than twice that of competitors’ 40A half

bricks. Over 2 square inches of board space can be saved

for every slot in which a 40A half brick is replaced with a

QM48S40 converter from Power-One.

Low body profile and the preclusion of heat sinks minimize

impedance to system airflow, thus enhancing cooling for

downstream devices. The use of 100% automation for as-

sembly, coupled with Power-One’s advanced electric and

thermal design, results in a product with extremely high reli-

ability.

Operating from a 36-75 V input, the QmaXTM Series con-

verters provide any standard output voltage from 3.3 V down

to 1.0 V. Outputs can be trimmed from –20% to +10% of the

nominal output voltage (±10% for output voltages 1.2 V and

1.0 V), thus providing outstanding design flexibility.

Applications

• Telecommunications

• Data communications

• Wireless

• Servers

QM48S40 Converter

Features

• RoHS lead-free solder and lead-solder-exempted

products are available

• Delivers up to 40 A (132 W)

• Industry-standard SM quarter-brick pinout

• Higher current capability at 70 ºC than most competi-

tors’ 40 A half-bricks

• On-board input differential LC-filter

• Outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V

• High efficiency – no heat sink required

• Start-up into pre-biased output

• No minimum load required

• Low profile: 0.28” [7.1 mm]

• Low weight: 1.06 oz [30 g] typical

• Meets Basic Insulation requirements of EN60950

• Withstands 100 V input transient for 100 ms

• Fixed-frequency operation

• Fully protected

• Remote output sense

• Output voltage trim range: +10%/20% with Industry-

standard trim equations (except 1.2 V and 1.0 V out-

puts with trim range ±10%)

• High reliability: MTBF of 2.6 million hours, calculated

per Telcordia TR-332, Method I Case 1

• Positive or negative logic ON/OFF option

• UL 60950 recognition in US and Canada and DEMKO

certification per IEC/EN 60950

• Meets conducted emissions requirements of FCC

Class B and EN 55022 Class B with external filter

• All materials meet UL94, V-0 flammability rating

NOV 13, 2006 revised to MAR 28, 2007 Page 2 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Output

Electrical Specifications (common to all versions)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, All output voltages, unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

ABSOLUTE MAXIMUM RATINGS

Input Voltage Continuous 0 80 Vdc

Operating Ambient Temperature -40 85 °C

Storage Temperature -55 125 °C

INPUT CHARACTERISTICS

Operating Input Voltage Range 36 48 75 Vdc

Input Under Voltage Lockout Non-latching

Turn-on Threshold 33 34 35 Vdc

Turn-off Threshold 31 32 33 Vdc

Input Voltage Transient 100 ms 100 Vdc

ISOLATION CHARACTERISTICS

I/O Isolation 2000 Vdc

Isolation Capacitance 1.4 nF

Isolation Resistance 10 M

FEATURE CHARACTERISTICS

Switching Frequency 415 kHz

Output Voltage Trim Range1 Industr

-std. e

uations

(

3.3 -1.5 V

)

-20 +10 %

Use trim e

uation on Pa

e 4

(

1.2 -1.0 V

)

-10 +10 %

Remote Sense Compensation1 Percent of VOUT(NOM) +10 %

Output Over-Voltage Protection Non-latching 117 128 140 %

Auto-Restart Period Applies to all protection features 100 ms

Turn-On Time 4 ms

ON/OFF Control (Positive Logic)

Converter Off -20 0.8 Vdc

Converter On 2.4 20 Vdc

ON/OFF Control (Negative Logic)

Converter Off 2.4 20 Vdc

Converter On -20 0.8 Vdc

Additional Notes:

1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources

should not exceed 10% of VOUT(NOM), in order to insure specified operation of over-voltage protection circuitry.

NOV 13, 2006 revised to MAR 28, 2007 Page 3 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Output

Operation

Input and Output Impedance

These power converters have been designed to be stable

with no external capacitors when used in low inductance in-

put and output circuits.

However, in many applications, the inductance associated

with the distribution from the power source to the input of the

converter can affect the stability of the converter. The addi-

tion of a 33 µF electrolytic capacitor with an ESR < 1 Ω

across the input helps ensure stability of the converter. In

many applications, the user has to use decoupling capaci-

tance at the load. The power converter will exhibit stable op-

eration with external load capacitance up to 40,000 µF on

3.3 – 1.0 V outputs.

ON/OFF (Pin 2)

The ON/OFF pin is used to turn the power converter on or

off remotely via a system signal. There are two remote con-

trol options available, positive logic and negative logic and

both are referenced to Vin(-). Typical connections are shown

in Fig. A.

Rload

Vin

CONTROL

INPUT

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

(Top View)

Converter

QmaX

TM Series

Fig. A: Circuit configuration for ON/OFF function.

The positive logic version turns on when the ON/OFF pin is

at a logic high and turns off when at a logic low. The con-

verter is on when the ON/OFF pin is left open.

The negative logic version turns on when the pin is at a logic

low and turns off when the pin is at a logic high. The

ON/OFF pin can be hard wired directly to Vin(-) to enable

automatic power up of the converter without the need of an

external control signal.

ON/OFF pin is internally pulled-up to 5 V through a resistor.

A mechanical switch, open collector transistor, or FET can

be used to drive the input of the ON/OFF pin. The device

must be capable of sinking up to 0.2 mA at a low level volt-

age of ≤ 0.8 V. An external voltage source (±20 V maximum)

may be connected directly to the ON/OFF input, in which

case it must be capable of sourcing or sinking up to 1 mA

depending on the signal polarity. See the Start-up Informa-

tion section for system timing waveforms associated with

use of the ON/OFF pin.

Remote Sense (Pins 5 and 7)

The remote sense feature of the converter compensates for

voltage drops occurring between the output pins of the con-

verter and the load. The SENSE(-) (Pin 5) and SENSE(+)

(Pin 7) pins should be connected at the load or at the point

where regulation is required (see Fig. B).

100

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

(Top View)

Converter

QmaX

Series

Fig. B: Remote sense circuit configuration.

If remote sensing is not required, the SENSE(-) pin must be

connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin

must be connected to the Vout(+) pin (Pin 8) to ensure the

converter will regulate at the specified output voltage. If

these connections are not made, the converter will deliver an

output voltage that is slightly higher than the specified value.

Because the sense leads carry minimal current, large traces

on the end-user board are not required. However, sense

traces should be located close to a ground plane to minimize

system noise and insure optimum performance. When wiring

discretely, twisted pair wires should be used to connect the

sense lines to the load to reduce susceptibility to noise.

The converter’s output over-voltage protection (OVP) senses

the voltage across Vout(+) and Vout(-), and not across the

sense lines, so the resistance (and resulting voltage drop)

between the output pins of the converter and the load should

be minimized to prevent unwanted triggering of the OVP.

When utilizing the remote sense feature, care must be taken

not to exceed the maximum allowable output power capabil-

ity of the converter, equal to the product of the nominal out-

put voltage and the allowable output current for the given

conditions.

NOV 13, 2006 revised to MAR 28, 2007 Page 4 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

When using remote sense, the output voltage at the con-

verter can be increased by as much as 10% above the

nominal rating in order to maintain the required voltage

across the load. Therefore, the designer must, if necessary,

decrease the maximum current (originally obtained from the

derating curves) by the same percentage to ensure the con-

verter’s actual output power remains at or below the maxi-

mum allowable output power.

Output Voltage Adjust /TRIM (Pin 6)

The output voltage can be adjusted up 10% or down 20% for

Vout  1.5 V, and ±10% for Vout = 1.2 V and 1.0 V relative

to the rated output voltage by the addition of an externally

connected resistor. For 3.3 V output voltage, trim up to 10%

is guaranteed only at Vin  40 V, and it is marginal (8% to

10%) at Vin = 36 V.

The TRIM pin should be left open if trimming is not being

used. To minimize noise pickup, a 0.1 µF capacitor is con-

nected internally between the TRIM and SENSE(-) pins.

To increase the output voltage, refer to Fig. C. A trim resis-

tor, RT-INCR, should be connected between the TRIM (Pin 6)

and SENSE(+) (Pin 7), with a value of:

10.22

1.225Δ

626Δ)V5.11(100

RNOMO

INCRT −

−+

=−

− [kΩ] (3.3 -1.5V)

7.2

84.6

RINCRT −=− [kΩ] (1.2 V)

120

RINCRT −=− [kΩ] (1.0 V)

where,

=−INCRTRRequired value of trim-up resistor kΩ]

=−NOMOVNominal value of output voltage [V]

100X

)V(V

NOM- O

NOM-OREQ-O −

= [%]

=−REQOVDesired (trimmed) output voltage [V].

When trimming up, care must be taken not to exceed the

converter‘s maximum allowable output power. See previous

section for a complete discussion of this requirement.

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

T-INCR

(Top View)

Converter

Series

QmaX

Fig. C: Configuration for increasing output voltage.

To decrease the output voltage (Fig. D), a trim resistor,

RT-DECR, should be connected between the TRIM (Pin 6) and

SENSE(-) (Pin 5), with a value of:

10.22

|Δ|

511

RDECRT −=− [kΩ] (3.3 - 1.5 V)

|Δ|

700

RDECRT −=− [kΩ] (1.2 V)

|Δ|

700

RDECRT −=− [kΩ] (1.0 V)

where,

−DECRTRRequired value of trim-down resistor [kΩ]

and

is as defined above.

Note: The above equations for calculation of trim resistor

values match those typically used in conventional industry-

standard quarter bricks (except for 1.2 V and 1.0 V outputs).

Converters with output voltages 1.2 V and 1.0 V are avail-

able with alternative trim feature to provide the customers

with the flexibility of second sourcing.

For 1.2 V and 1.0 V only, “T” version converter with the last

character in the part number “T” uses the following trim

equations:

485

RINCRT =− [kΩ] (1.2V)

323

RINCRT −=− [kΩ] (1.0V)

10.22

|Δ|

511

RDECRT −=− [kΩ] (For 1.2V and 1.0V)

For 1.2V only, “U” version converter with the last character in

the part number “U” uses the following trim equations:

100

RINCRT =− [kΩ]

|Δ|

100

RDECRT −=− [kΩ]

NOV 13, 2006 revised to MAR 28, 2007 Page 5 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

T-DECR

(Top View)

Converter

Series

QmaX

QmaXQmaX

Fig. D: Configuration for decreasing output voltage.

Trimming/sensing beyond 110% of the rated output voltage

is not an acceptable design practice, as this condition could

cause unwanted triggering of the output over-voltage protec-

tion (OVP) circuit. The designer should ensure that the dif-

ference between the voltages across the converter’s output

pins and its sense pins does not exceed 10% of VOUT(NOM),

or:

X NOM-O SENSESENSEOUTOUT 10%V)](V)([V)](V)([V ≤−−+−−−+ [V]

This equation is applicable for any condition of output sens-

ing and/or output trim.

Protection Features

Input Undervoltage Lockout

Input undervoltage lockout is standard with this converter.

The converter will shut down when the input voltage drops

below a pre-determined voltage.

The input voltage must be typically 34 V for the converter to

turn on. Once the converter has been turned on, it will shut

off when the input voltage drops typically below 32 V. This

feature is beneficial in preventing deep discharging of batter-

ies used in telecom applications.

Output Overcurrent Protection (OCP)

The converter is protected against overcurrent or short cir-

cuit conditions. Upon sensing an over-current condition, the

converter will switch to constant current operation and

thereby begin to reduce output voltage. When the output

voltage drops below 50% of the nominal value of output volt-

age, the converter will shut down.

Once the converter has shut down, it will attempt to restart

nominally every 100 ms with a typical 1-2% duty cycle. The

attempted restart will continue indefinitely until the overload

or short circuit conditions are removed or the output voltage

rises above 50% of its nominal value.

Output Overvoltage Protection (OVP)

The converter will shut down if the output voltage across

Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of

the OVP circuitry. The OVP circuitry contains its own refer-

ence, independent of the output voltage regulation loop.

Once the converter has shut down, it will attempt to restart

every 100 ms until the OVP condition is removed.

Overtemperature Protection (OTP)

The converter will shut down under an over-temperature

condition to protect itself from overheating caused by opera-

tion outside the thermal derating curves, or operation in ab-

normal conditions such as system fan failure. After the con-

verter has cooled to a safe operating temperature, it will

automatically restart.

Safety Requirements

The converters meet North American and International

safety regulatory requirements per UL60950 and EN60950.

Basic Insulation is provided between input and output.

To comply with safety agencies requirements, an input line

fuse must be used external to the converter. The Table be-

low provides the recommended fuse rating for use with this

family of products.

Output Voltage Fuse Rating

3.3 V

7.5

1.8

1.5

Modules are UL approved for maximum fuse rating of 15-A.

To protect a group of modules with a single fuse, the rating

can be increased from the recommended values above.

Electromagnetic Compatibility (EMC)

EMC requirements must be met at the end-product system

level, as no specific standards dedicated to EMC character-

istics of board mounted component dc-dc converters exist.

However, Power-One tests its converters to several system

level standards, primary of which is the more stringent

EN55022, Information technology equipment - Radio distur-

bance characteristics - Limits and methods of measurement.

Effective internal LC differential filter significantly reduces

input reflected ripple current, and improves EMC.

With the addition of a simple external filter, all versions of the

QmaX™ Series of converters pass the requirements of

Class B conducted emissions per EN55022 and FCC, and

meet at a minimum, Class A radiated emissions per EN

55022 and Class B per FCC Title 47CFR, Part 15-J. Please

contact Power-One Applications Engineering for details of

this testing.

NOV 13, 2006 revised to MAR 28, 2007 Page 6 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Characterization

General Information

The converter has been characterized for many operational

aspects, to include thermal derating (maximum load current

as a function of ambient temperature and airflow) for vertical

and horizontal mounting, efficiency, start-up and shutdown

parameters, output ripple and noise, transient response to

load step-change, overload and short circuit.

The figures are numbered as Fig. x.y, where x indicates the

different output voltages, and y associates with specific plots

(y = 1 for the vertical thermal derating, …). For example, Fig.

x.1 will refer to the vertical thermal derating for all the output

voltages in general.

The following pages contain specific plots or waveforms as-

sociated with the converter. Additional comments for specific

data are provided below.

Test Conditions

All data presented were taken with the converter soldered to

a test board, specifically a 0.060” thick printed wiring board

(PWB) with four layers. The top and bottom layers were not

metalized. The two inner layers, comprising two-ounce cop-

per, were used to provide traces for connectivity to the con-

verter.

The lack of metalization on the outer layers as well as the

limited thermal connection ensured that heat transfer from

the converter to the PWB was minimized. This provides a

worst-case but consistent scenario for thermal derating pur-

poses.

All measurements requiring airflow were made in Power-

One’s vertical and horizontal wind tunnel facilities using In-

frared (IR) thermography and thermocouples for thermome-

try.

Ensuring components on the converter do not exceed their

ratings is important to maintaining high reliability. If one an-

ticipates operating the converter at or close to the maximum

loads specified in the derating curves, it is prudent to check

actual operating temperatures in the application. Thermo-

graphic imaging is preferable; if this capability is not avail-

able, then thermocouples may be used. Power-One recom-

mends the use of AWG #40 gauge thermocouples to ensure

measurement accuracy. Careful routing of the thermocouple

leads will further minimize measurement error. Refer to Fig-

ure H for optimum measuring thermocouple location.

Thermal Derating

Load current vs. ambient temperature and airflow rates are

given in Figs. x.1 and x.2 for vertical and horizontal converter

mounting. Ambient temperature was varied between 25°C

and 85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5

m/s).

For each set of conditions, the maximum load current was

defined as the lowest of:

(i) The output current at which any FET junction temperature

does not exceed a maximum specified temperature (120°C)

as indicated by the thermographic image, or

(ii) The nominal rating of the converter (40 A on 3.3 – 1.0 V).

During normal operation, derating curves with maximum FET

temperature less than or equal to 120°C should not be ex-

ceeded. Temperature on the PCB at the thermocouple loca-

tion shown in Fig. H should not exceed 118°C in order to

operate inside the derating curves.

Efficiency

Fig. x.3 shows the efficiency vs. load current plot for ambient

temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s) with

vertical mounting and input voltages of 36 V, 48 V and 72 V.

Also, a plot of efficiency vs. load current, as a function of

ambient temperature with Vin = 48 V, airflow rate of 200 LFM

(1 m/s) with vertical mounting is shown in Fig. x.4.

Power Dissipation

Fig. x.5 shows the power dissipation vs. load current plot for

Ta = 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical

mounting and input voltages of 36 V, 48 V and 72 V. Also, a

plot of power dissipation vs. load current, as a function of

ambient temperature with Vin = 48 V, airflow rate of 200 LFM

(1 m/s) with vertical mounting is shown in Fig. x.6.

Start-up

Output voltage waveforms, during the turn-on transient using

the ON/OFF pin for full rated load currents (resistive load)

are shown without and with external load capacitance in

Fig. x.7 and Fig. x.8, respectively.

Ripple and Noise

Fig. x.10 shows the output voltage ripple waveform, meas-

ured at full rated load current with a 10 µF tantalum and 1 µF

ceramic capacitor across the output. Note that all output

voltage waveforms are measured across a 1 μF ceramic ca-

pacitor.

The input reflected ripple current waveforms are obtained

using the test setup shown in Fig x.11. The corresponding

waveforms are shown in Fig. x.12 and Fig. x.14.

NOV 13, 2006 revised to MAR 28, 2007 Page 7 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Start-up Information (using negative ON/OFF)

Scenario #1: Initial Start-up From Bulk Supply

ON/OFF function enabled, converter started via application of VIN.

See Figure E.

Time Comments

t0 ON/OFF pin is ON; system front end power is toggled

on, VIN to converter begins to rise.

t1 V

IN crosses Under-Voltage Lockout protection circuit

threshold; converter enabled.

t2 Converter begins to respond to turn-on command (con-

verter turn-on delay).

t3 Converter VOUT reaches 100% of nominal value.

For this example, the total converter start-up time (t3- t1) is typically

4 ms.

Scenario #2: Initial Start-up Using ON/OFF Pin

With VIN previously powered, converter started via ON/OFF pin.

See Figure F.

Time Comments

t0 V

INPUT at nominal value.

t1 Arbitrary time when ON/OFF pin is enabled (converter

enabled).

t2 End of converter turn-on delay.

t3 Converter VOUT reaches 100% of nominal value.

For this example, the total converter start-up time (t3- t1) is typically

4 ms.

Scenario #3: Turn-off and Restart Using ON/OFF Pin

With VIN previously powered, converter is disabled and then en-

abled via ON/OFF pin. See Figure G.

Time Comments

t0 V

IN and VOUT are at nominal values; ON/OFF pin ON.

t1 ON/OFF pin arbitrarily disabled; converter output falls

to zero; turn-on inhibit delay period (100 ms typical) is

initiated, and ON/OFF pin action is internally inhibited.

t2 ON/OFF pin is externally re-enabled.

If (t2- t1) ≤ 100 ms, external action of ON/OFF pin

is locked out by start-up inhibit timer.

If (t2- t1) > 100 ms, ON/OFF pin action is internally

enabled.

t3 Turn-on inhibit delay period ends. If ON/OFF pin is ON,

converter begins turn-on; if off, converter awaits

ON/OFF pin ON signal; see Figure F.

t4 End of converter turn-on delay.

t5 Converter VOUT reaches 100% of nominal value.

For the condition, (t2- t1) ≤ 100 ms, the total converter start-up

time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will

be typically 4 ms after release of ON/OFF pin.

Fig. E: Start-up scenario #1.

ON/OFF

STATE

VOUT

t0t1t2t3

OFF

VIN

Fig. F: Start-up scenario #2.

ON/OFF

STATE OFF

VOUT

t0t2t1t5

VIN

t4t3

100 ms

Fig. G: Start-up scenario #3.

VIN

ON/OFF

STATE

VOUT

t0t1t2t3

OFF

NOV 13, 2006 revised to MAR 28, 2007 Page 8 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40033 (3.3 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=3.3 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 3.3 Vdc Out @ 36 Vdc In 4.1 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 63 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 3.267 3.300 3.333 Vdc

Output Regulation

Over Line ±2 ±5 mV

Over Load ±2 ±5 mV

Output Voltage Range Over line, load and temperature2 3.250 3.350 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 80 µs

EFFICIENCY

100% Load 90.5 %

50% Load 92.5 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 3.3V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40033 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 3.3V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40033 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 9 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40033 (3.3 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 3.3V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 3.3V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 3.3V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 3.3V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 10 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40033 (3.3 Volts Out)

Fig. 3.3V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.) Time scale: 2 ms/div.

Fig. 3.3V9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 3.3V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 2 ms/div.

Fig. 3.3V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 11 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40033 (3.3 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 3.3V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 3.3V12: Input reflected ripple current, is (10 mA/div),

measured through 10 μH at the source at full rated load cur-

rent and Vin = 48 V. Refer to Fig. 3.3V.11 for test setup.

Time scale: 1μs/div.

Iout [Adc]

15 60

4.0

Vout [Vdc]

2.0

1.0

30 45

3.0

Fig. 3.3V.13: Output voltage vs. load current showing cur-

rent limit point and converter shutdown point. Input voltage

has almost no effect on current limit characteristic.

Fig. 3.3V14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 3.3V.11 for test setup. Time scale: 1

μs/div.

Fig. 3.3V.15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 12 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40025 (2.5 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.5 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 2.5 Vdc Out @ 36 Vdc In 3.2 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 50 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 10 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 2.475 2.500 2.525 Vdc

Output Regulation

Over Line ±2 ±5 mV

Over Load ±2 ±5 mV

Output Voltage Range Over line, load and temperature2 2.462 2.538 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 100 µs

EFFICIENCY

100% Load 89 %

50% Load 91 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 2.5V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40025 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 2.5V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40025 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 13 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40025 (2.5 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 2.5V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 2.5V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 2.5V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 2.5V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 14 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40025 (2.5 Volts Out)

Fig. 2.5V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.) Time scale: 2 ms/div.

Fig. 2.5V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 2.5V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 2 ms/div.

Fig. 2.5V.10: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 μF tantalum + 1uF ce-

ramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 15 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40025 (2.5 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 2.5V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 2.5V.12: Input reflected ripple current, is (10 mA/div),

measured through 10 μH at the source at full rated load cur-

rent and Vin = 48 V. Refer to Fig. 2.5V.11 for test setup.

Time scale: 1μs/div.

15 60

3.0

Iout [Adc]

Vout [Vdc]

2.5

1.0

0.5

30 45

2.0

1.5

Fig. 2.5V.13: Output voltage vs. load current showing cur-

rent limit point and converter shutdown point. Input voltage

has almost no effect on current limit characteristic.

Fig. 2.5V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 2.5V.11 for test setup. Time scale: 1

μs/div.

Fig. 2.5V.15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 16 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40020 (2.0 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.0 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 2.0 Vdc Out @ 36 Vdc In 2.6 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 40 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 1.98 2.000 2.02 Vdc

Output Regulation

Over Line ±2 ±5 mV

Over Load ±2 ±5 mV

Output Voltage Range Over line, load and temperature2 1.970 2.030 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 110 µs

EFFICIENCY

100% Load 88 %

50% Load 90 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 2.0V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40020 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 2.0V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40020 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 17 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40020 (2.0 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 2.0V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 2.0V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 2.0V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 2.0V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 18 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40020 (2.0 Volts Out)

Fig. 2.0V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.) Time scale: 2 ms/div.

Fig. 2.0V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 2.0V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 2 ms/div.

Fig. 2.0V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 19 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40020 (2.0 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 2.0V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 2.0V.12: Input reflected ripple current, is (10 mA/div), meas-

ured through 10 μH at the source at full rated load current and

Vin = 48 V. Refer to Fig. 2.0V.11 for test setup. Time scale:

1μs/div.

15 60

3.0

Iout [Adc]

Vout [Vdc]

2.5

1.0

0.5

30 45

2.0

1.5

Fig. 2.0V.13: Output voltage vs. load current showing cur-

rent limit point and converter shutdown point. Input voltage

has almost no effect on current limit characteristic.

Fig. 2.0V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 2.0V.11 for test setup. Time scale: 1

μs/div.

Fig. 2.0V.15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 20 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40018 (1.8 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.8 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 1.8 Vdc Out @ 36 Vdc In 2.4 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 38 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 10 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 1.782 1.800 1.818 Vdc

Output Regulation

Over Line ±2 ±4 mV

Over Load ±2 ±5 mV

Output Voltage Range Over line, load and temperature2 1.773 1.827 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 120 µs

EFFICIENCY

100% Load 87 %

50% Load 89.5 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.8V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40018 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.8V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40018 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 21 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40018 (1.8 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 1.8V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 1.8V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 1.8V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 1.8V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 22 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40018 (1.8 Volts Out)

Fig. 1.8V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (1 V/div.) Time scale: 2 ms/div.

Fig. 1.8V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.8V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (1 V/div.). Time scale: 2 ms/div.

Fig. 1.8V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 23 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40018 (1.8 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 1.8V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 1.8V.12: Input reflected ripple current, is (10 mA/div), meas-

ured through 10 μH at the source at full rated load current and

Vin = 48 V. Refer to Fig. 1.8V.11 for test setup. Time scale:

1μs/div.

15 60

3.0

Iout [Adc]

Vout [Vdc]

2.5

1.0

0.5

30 45

2.0

1.5

Fig. 1.8V.13: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has al-

most no effect on current limit characteristic.

Fig. 1.8V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin =

48 V. Refer to Fig. 1.8V.11 for test setup. Time scale: 1 μs/div.

Fig. 1.8V.15: Load current (top trace, 20 A/div, 20 ms/div) into

a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace

(20 A/div, 2 ms/div) is an expansion of the on-time portion of

the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 24 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40015 (1.5 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.5 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 1.5 Vdc Out @ 36 Vdc In 2 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 32 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 1.485 1.500 1.515 Vdc

Output Regulation

Over Line ±2 ±4 mV

Over Load ±2 ±4 mV

Output Voltage Range Over line, load and temperature2 1.477 1.523 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 150 µs

EFFICIENCY

100% Load 85.5 %

50% Load 88 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.5V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40015 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.5V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40015 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 25 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40015 (1.5 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 1.5V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 1.5V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 1.5V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 1.5V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 26 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40015 (1.5 Volts Out)

Fig. 1.5V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.

Fig. 1.5V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.5V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 2 ms/div.

Fig. 1.5V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 27 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40015 (1.5 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 1.5V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 1.5V.12: Input reflected ripple current, is (10 mA/div),

measured through 10 μH at the source at full rated load cur-

rent and Vin = 48 V. Refer to Fig. 1.5V.11 for test setup.

Time scale: 1μs/div.

15 60

2.0

Iout [Adc]

Vout [Vdc]

1.5

1.0

0.5

30 45

Fig. 1.5V.13: Output voltage vs. load current showing cur-

rent limit point and converter shutdown point. Input voltage

has almost no effect on current limit characteristic.

Fig. 1.5V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 1.5V.11 for test setup. Time scale: 1

μs/div.

Fig. 1.5V.15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 28 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40012 (1.2 Volts Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.2 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 1.2 Vdc Out @ 36 Vdc In 1.7 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 28 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 1.188 1.200 1.212 Vdc

Output Regulation

Over Line ±1 ±3 mV

Over Load ±1 ±3 mV

Output Voltage Range Over line, load and temperature2 1.176 1.224 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 250 µs

EFFICIENCY

100% Load 83 %

50% Load 86.5 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.2V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40012 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.2V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40012 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 29 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40012 (1.2 Volts Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 1.2V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 1.2V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 1.2V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 1.2V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 30 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40012 (1.2 Volts Out)

Fig. 1.2V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.

Fig. 1.2V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.2V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 2 ms/div.

Fig. 1.2V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 31 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40012 (1.2 Volts Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 1.2V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 1.2V.12: Input reflected ripple current, is (10 mA/div),

measured through 10 μH at the source at full rated load cur-

rent and Vin = 48 V. Refer to Fig. 1.2V.11 for test setup.

Time scale: 1μs/div.

15 60

Iout [Adc]

Vout [Vdc]

30 45

1.5

1.0

0.5

Fig. 1.2V.13: Output voltage vs. load current showing cur-

rent limit point and converter shutdown point. Input voltage

has almost no effect on current limit characteristic.

Fig. 1.2V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 1.2V.11 for test setup. Time scale: 1

μs/div.

Fig. 1.2V.15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 32 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Electrical Specifications: QM48S40010 (1.0 Volt Out)

Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.0 Vdc unless otherwise specified.

PARAMETER NOTES MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Maximum Input Current 40 Adc, 1.0 Vdc Out @ 36 Vdc In 1.4 Adc

Input Stand-by Current Vin = 48 V, converter disabled 3 mAdc

Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 27 mAdc

Input Reflected-Ripple Current 25MHz bandwidth 7.5 mAPK-PK

Input Voltage Ripple Rejection 120Hz TBD dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point (no load) 0.990 1.000 1.010 Vdc

Output Regulation

Over Line ±1 ±3 mV

Over Load ±1 ±3 mV

Output Voltage Range Over line, load and temperature2 0.980 1.020 Vdc

Output Ripple and Noise - 25MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mVPK-PK

External Load Capacitance Plus full load (resistive) 40,000 F

Output Current Range 0 40 Adc

Current Limit Inception Non-latching 42 47 52 Adc

Peak Short-Circuit Current Non-latching. Short=10m. 50 60 A

RMS Short-Circuit Current Non-latching 10 15 Arms

DYNAMIC RESPONSE

Load Change 25% of Iout Max, di/dt = 1 A/S Co = 470 F tantalum + 1 F ceramic 120 mV

Setting Time to 1% 280 µs

EFFICIENCY

100% Load 81 %

50% Load 85 %

Additional Notes: 2. -40ºC to 85ºC

Ambient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.0V.1: Available load current vs. ambient air temperature

and airflow rates for QM48S40010 converter mounted verti-

cally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

mbient Tem

erature

[

°C

]

20 30 40 50 60 70 80 90

Load Current [Adc]

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

Fig. 1.0V.2: Available load current vs. ambient air temperature

and airflow rates for QM48S40010 converter mounted horizon-

tally with air flowing from pin 3 to pin 1, MOSFET temperature

≤ 120°C, Vin = 48 V.

NOV 13, 2006 revised to MAR 28, 2007 Page 33 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40010 (1.0 Volt Out)

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

72 V

48 V

36 V

Fig. 1.0V.3: Efficiency vs. load current and input voltage for

converter mounted vertically with air flowing from pin 3 to pin 1

at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

72 V

48 V

36 V

Fig. 1.0V.5: Power dissipation vs. load current and input volt-

age for converter mounted vertically with air flowing from pin 3

to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Load Current [Adc]

0 1020304050

Efficiency

0.65

0.70

0.75

0.80

0.85

0.90

0.95

70 C

55 C

40 C

Fig. 1.0V.4: Efficiency vs. load current and ambient tempera-

ture for converter mounted vertically with Vin = 48 V and air

flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

Load Current [Adc]

0 1020304050

ower

[W]

0.00

4.00

8.00

12.00

16.00

70 C

55 C

40 C

Fig. 1.0V.6: Power dissipation vs. load current and ambient

temperature for converter mounted vertically with Vin = 48 V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0

m/s).

NOV 13, 2006 revised to MAR 28, 2007 Page 34 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40010 (1.0 Volt Out)

Fig. 1.0V.7: Turn-on transient at full rated load current (resis-

tive) with no output capacitor at Vin = 48 V, triggered via

ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom

trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.

Fig. 1.0V.9: Output voltage response to load current step-

change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output

voltage (100 mV/div.). Bottom trace: load current (10 A/div).

Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-

ramic. Time scale: 0.2 ms/div.

Fig. 1.0V.8: Turn-on transient at full rated load current (resis-

tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-

age (0.5 V/div.). Time scale: 2 ms/div.

Fig. 1.0V.10: Output voltage ripple (20 mV/div.) at full rated

load current into a resistive load with Co = 10 μF tantalum +

1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.

NOV 13, 2006 revised to MAR 28, 2007 Page 35 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

QM48S40010 (1.0 Volt Out)

Vout

Vsource

1 μF

ceramic

capacitor

10 μH

source

inductance

DC/DC

Converter

33 μF

ESR <1

electrolytic

capacitor

QmaX

Series

QmaX

Fig. 1.0V.11: Test setup for measuring input reflected ripple currents, ic and is.

Fig. 1.0V.12: Input reflected ripple current, is (10 mA/div),

measured through 10 μH at the source at full rated load cur-

rent and Vin = 48 V. Refer to Fig. 1.0V.11 for test setup.

Time scale: 1μs/div.

15 60

Iout [Adc]

Vout [Vdc]

30 45

1.5

1.0

0.5

Fig. 1.0V13: Output voltage vs. load current showing current

limit point and converter shutdown point. Input voltage has

almost no effect on current limit characteristic.

Fig. 1.0V.14: Input reflected ripple current, ic (100 mA/div),

measured at input terminals at full rated load current and Vin

= 48 V. Refer to Fig. 1.0V.11 for test setup. Time scale: 1

μs/div.

Fig. 1.0V15: Load current (top trace, 20 A/div, 20 ms/div)

into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-

tom trace (20 A/div, 1 ms/div) is an expansion of the on-time

portion of the top trace.

NOV 13, 2006 revised to MAR 28, 2007 Page 36 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Physical Information

SIDE VIEW

TOP VIEW

Converter Part Numbering Scheme

Product

Series

Input

Voltage

Mounting

Scheme

Rated

Load

Current

Output

Voltage ON/OFF

Logic

Maximum

Height (HT)

Length (PL)

Special

Features

QM 48 S 40 033 - N S 0 0

Quarter-Brick

Format 36-75 V Surface

Mount

40 A

(1.0 - 3.3 V)

010 ⇒ 1.0 V

012 ⇒ 1.2 V

015 ⇒ 1.5 V

018 ⇒ 1.8 V

020 ⇒ 2.0 V

025 ⇒ 2.5 V

033 ⇒ 3.3 V

N ⇒ Negative

P ⇒ Positive

S ⇒ 0.295”

0 ⇒ 0.00”

0 ⇒ STD

U ⇒ Special

Trim2

(For 1.2V only)

T ⇒ Special

Trim2

(For 1.2V &

1.0V only)

1. The example above describes P/N QM48T40033-NS00: 36-75 V input, surface mount, 40 A @ 3.3 V output, negative ON/OFF logic, a maximum height

of 0.295”. Please consult factory regarding availability of a specific version.

2. For definitions, operation, and associated trim equations for all trim options please refer to Application Note 103, Trim Feature for Isolated dc-dc.

Models highlighted in yellow or shaded are not recommended for new designs.

RoHS Ordering Information:

• No RoHS suffix character is required for lead-solder-exemption compliance.

• For RoHS compliance to all six substances, add the letter "G" as the last letter of the part number.

Pin Connections

Pin # Function

1 Vin (+)

2 ON/OFF

3 Vin (-)

4 Vout (-)

5 SENSE(-)

6 TRIM

7 SENSE(+)

8 Vout (+)

QM48S Platform Notes

• All dimensions are in inches [mm]

• Connector Material: Copper

• Connector Finish: Gold over Nickel

• Converter Weight: 1.06oz [30 g]

• Recommended Surface-Mount Pads:

Min. 0.080” X 0.112” [2.03 x 2.84]

Max. 0.092” X 0.124” [2.34 x 3.15]

NOV 13, 2006 revised to MAR 28, 2007 Page 37 of 37 www.power-one.com

QM48S DC-DC Converter Series Data Sheet

40A Out

Fig. H: Location of the thermocouple for thermal testing.

NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as components in life support

systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of

Power-One, Inc.

TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date

manufactured. Specifications are subject to change without notice.