SQE48T40015-NDA0G - Power-One - Datasheet.Directory

ZD-01745_1.1_September-10-2013 1 www.power-one.com

DATA SHEET

o Telecommunications

o Data communications

o Wireless communications

o Servers, workstations

 High efficiency – no heat sink required

 Higher current capability at elevated

temperatures than competitors’ 40A

quarter-bricks

 Industry-standard eighth brick footprint:

0.896” x 2.30” (2.06 in2), 38% smaller

than conventional quarter-bricks

The new high performance 40A SQE48T40015 DC-DC converter provides a high efficiency single output, in an eighth brick package

that is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation in systems that have limited airflow

and increased ambient temperatures, the SQE48T40015 converter utilize the same pinout and functionality of the industry-standard

quarter-bricks.

The SQE48T40015 converter provides thermal performance in high temperature environments that exceeds most 40A quarter-bricks in

the market. This performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing tech-

niques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile.

Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and

downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results

in a product with extremely high reliability.

Operating from a 36-75V input, the SQE48T40015 converter provides a 1.5V output voltage that can be trimmed from –20% to +10% of

the nominal output voltage, thus providing outstanding design flexibility.

With standard pinout and trim equations, the SQE48T40015 converter is a perfect drop-in replacement for existing 40A quarter-brick

designs. Inclusion of this converter in a new design can result in significant board space and cost savings. The designer can expect

reliability improvement over other available converters because of the SQE48T40015’s optimized thermal efficiency.

SQE48T40015 DC-DC CONVERTER

36-75VDC Input; 1.5VDC, 40A, 60W Output

 RoHS lead-free solder and lead-solder-exempted products are available

 Delivers up to 40A

 Industry-standard eighth-brick pinout

 On-board input differential LC-filter

 Start-up into pre-biased load

 No minimum load required

 Weight: 0.88 oz [25.1g]

 Meets Basic Insulation requirements of EN60950

 Withstands 100V input transient for 100ms

 Fixed-frequency operation

 Fully protected

 Remote output sense

 Positive or negative logic ON/OFF option

 Low height of 0.374” (9.5mm)

 Output voltage trim range: +10%/−20% with industry-standard trim equations

 High reliability: MTBF = 15.4 million hours, calculated per Telcordia SR-332,

Method I Case 1

 UL60950 recognized in US and Canada and DEMKO certified per

IEC/EN60950 (pending)

 Designed to meet Class B conducted emissions per FCC and EN55022 when

used with external filter

 All materials meet UL94, V-0 flammability rating

FEATURES

DESCRIPTION

APPLICATIONS

BENEFITS

SQE48T40015 DC-DC Converter 2 www.power-one.com

DATA SHEET

1 ELECTRICAL SPECIFICATIONS

Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Absolute Maximum Ratings

Input Voltage

Continuous

-0.3

VDC

Operating Ambient Temperature

-40

°C

Operating Altitude

Iout = 40A

3000

Iout ≤ 32A

3001

10000

Storage Temperature

-55

125

°C

Isolation Characteristics

Standard Product: Option 0 (refer to CONVERTER PART NUMBERING/ORDERING INFORMATION)

I/O Isolation

2250

VDC

Isolation Capacitance

160

Isolation Resistance

MΩ

Option K (refer to CONVERTER PART NUMBERING/ORDERING INFORMATION)

I/O Isolation

1500

VDC

Isolation Capacitance

200

1500

Isolation Resistance

MΩ

Feature Characteristics

Switching Frequency

440

kHz

Output Voltage Trim Range1

Industry-std. equations

-20

+10

Remote Sense Compensation1

Percent of VOUT(nom)

+10

Output Overvoltage Protection

Non-latching

117

122

130

Overtemperature Shutdown (PCB)

Non-latching

125

°C

Operating Humidity

Non-condensing

Storage Humidity

Non-condensing

Peak Back-drive Output Current

(Sinking current from external source)

during startup into pre-biased output

Peak amplitude

ADC

Peak duration

µs

Back-drive Output Current (Sinking Current

from external source)

Converter OFF;

external voltage 5 VDC

mADC

Auto-Restart Period

Applies to all protection features

200

Turn-On Time

See Figures E, F, and G

ON/OFF Control (Positive Logic)

Converter Off (logic low)

-20

0.8

VDC

Converter On (logic high)

2.4

VDC

ON/OFF Control (Negative Logic)

Converter Off (logic high)

2.4

VDC

Converter On (logic low)

-20

0.8

VDC

Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources should not ex-

ceed 10% of VOUT(NOM), in order to ensure specified operation of overvoltage protection circuitry.

ZD-01745_1.1_September-10-2013 3 www.power-one.com

DATA SHEET

1 ELECTRICAL SPECIFICATIONS (CONTINUED)

Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Operating Input Voltage Range

VDC

Input Undervoltage Lockout

Turn-on Threshold

35.5

VDC

Turn-off Threshold

32.5

34.5

VDC

Lockout Hysteresis Voltage

1.0

2.0

VDC

Input Voltage Transient

100 ms

100

VDC

Input Voltage Transient Rate

V/ms

Input Current Transient Rate

0.1

A2s

Maximum Input Current

40 ADC Out @ 36 VDC In

VOUT = 1.5 VDC

2.0

ADC

Input Stand-by Current

Vin = 48V, converter disabled

Input No Load Current (0A load on the output)

Vin = 48V, converter enabled

VOUT = 1.5 VDC

Input Reflected-Ripple Current, is

Vin = 48V, 25 MHz bandwidth

VOUT = 1.5 VDC

mAPK-PK

Input Voltage Ripple Rejection

120 Hz, VOUT = 1.5 VDC

Output Characteristics

External Load Capacitance

Plus full load (resistive)

20,000

µF

Output Current Range

ADC

Current Limit Inception

Non-latching

ADC

Peak Short-Circuit Current

Non-latching, Short = 10 mΩ

RMS Short-Circuit Current

Non-latching

Arms

Output Voltage Set Point (no load)2

-1

%Vout

Output Regulation

Over Line

±2

±5

Over Load

±2

±5

Output Voltage Range

Over line, load and temperature2

-3.0

+3.0

%Vout

Output Ripple and Noise – 25 MHz bandwidth

Full load + 10µ F tantalum + 1µ F ceramic VOUT = 1.5VDC

mVPK-PK

Dynamic Response

Load Change 50%-75%-50% of Iout Max,

di/dt = 0.1 A/μs

Co = 1 µ F ceramic (Figure 8)

Settling Time to 1% of Vout

100

µs

di/dt = 2.5 A/μs

Co = 470µ F POS + 1µ F ceramic (Figure 9)

150

Settling Time to 1% of Vout

µs

Efficiency

100% Load

VOUT = 1.5 VDC

86.7

50% Load

VOUT = 1.5 VDC

Mechanical

Weight

25.1g

Vibration IEC Class 3M5

Freq. Velocity IEC 68-2-6

5-9Hz 5mm/s

Freq. Accelerat. IEC 68-2-6

9-200Hz 1g

Shocks IEC Class 3M5

Accelerat. IEC 68-2-29

10g

MIL-STD-202F

Method 213B Cond. F

Reliability

MTBF

Telcordia SR-332, Method I Case 1

50% electrical stress, 40° C ambient

15.4

MHrs

Operating ambient temperature range of -40 ºC to 85 ºC for converter.

SQE48T40015 DC-DC Converter 4 www.power-one.com

DATA SHEET

2 OPERATIONS

2.1 INPUT AND OUTPUT IMPEDANCE

These power converters have been designed to be stable with no external capacitors when used in low inductance input and

output circuits.

However, in some applications, the inductance associated with the distribution from the power source to the input of the con-

verter can affect the stability of the converter. A 33µ F electrolytic capacitor with an ESR < 1Ω across the input is recom-

mended to ensure stability of the converter over the wide range of input source impedance.

In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable opera-

tion with external load capacitance up to 20,000µ F.

2.2 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 control

options available, positive and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A.

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 the pin is at a logic low. The

converter is on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions.

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.

The ON/OFF pin is internally pulled up to 5V through a resistor. A properly de-bounced 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 0.2mA at a

low level voltage of  0.8V. An external voltage source (± 20V maximum) may be connected directly to the ON/OFF input, in

which case it must be capable of sourcing or sinking up to 1mA depending on the signal polarity. See the Startup Information

section for system timing waveforms associated with use of the ON/OFF pin.

2.3 REMOTE SENSE (Pins 5 and 7)

The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter

and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regula-

tion is required (see Fig. B).

Fig. B: Remote sense circuit configuration.

Rload

Vin

CONTROL

INPUT

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

(Top View)

SQE48 Converter

100

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

(Top View)

SQE48 Converter

CAUTION

If remote sensing is not utilized, 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 connec-

tions are not made, the converter will deliver an output voltage that is higher than the specified data sheet value.

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DATA SHEET

Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces

should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance.

The converter’s output overvoltage 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 capability of

the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given con-

ditions.

When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rat-

ing in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maxi-

mum current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output

power remains at or below the maximum allowable output power.

2.4 OUTPUT VOLTAGE ADJUST /TRIM (Pin 6)

The output voltage can be adjusted up 10% or down 20%, relative to the rated output voltage by the addition of an externally

connected resistor.

The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1µ F capacitor is connected

internally between the TRIM and SENSE(-) pins.

To increase the output voltage, refer to Fig. C. A trim resistor, 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],

where,

INCRTR

Required value of trim-up resistor kΩ]

NOMOV

Nominal value of output voltage [V]

100X

V)V(V

Δ NOM- O

NOM-OREQ-O 



[%]

REQOV

Desired (trimmed) output voltage [V].

When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous

section for a complete discussion of this requirement.

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]

where,

DECRTR

Required value of trim-down resistor [kΩ] and

is defined above.

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-)

RT-INCR

(Top View)

SQE48 Converter

Note: The above equations for calculation of trim resistor values match those typically used in conventional industry-

standard quarter-bricks.

SQE48T40015 DC-DC Converter 6 www.power-one.com

DATA SHEET

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 overvoltage protection (OVP) circuit. The designer should ensure that the difference

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 sensing and/or output trim.

3 PROTECTION FEATURES

3.1 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 34V for the converter to turn on. Once the converter has been turned on, it will shut off

when the input voltage drops typically below 33V. This feature is beneficial in preventing deep discharging of batteries used

in telecom applications.

3.2 OUTPUT OVERCURRENT PROTECTION (OCP)

The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the con-

verter will switch to constant current operation and thereby begin to reduce output voltage.

If the converter is equipped with the special OCP version designated by the suffix K in the part number, the converter will

shut down in approximately 15ms after entering the constant current mode of operation. The standard version (suffix 0) will

continue operating in the constant current mode until the output voltage drops below 60% at which point the converter will

shut down as shown in Figure 14.

Once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3-5% duty cycle as shown

in Figure 15. The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the

output voltage rises above 40-50% of its nominal value.

Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and con-

tinues normal operation.

3.3 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 reference, independent of the output voltage regulation loop. Once the

converter has shut down, it will attempt to restart every 200ms until the OVP condition is removed.

3.4 OVERTEMPERATURE PROTECTION (OTP)

The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation out-

side the thermal derating curves, or operation in abnormal conditions such as system fan failure. Converter with the non-

latching option will automatically restart after it has cooled to a safe operating temperature.

Rload

Vin

Vin (+)

Vin (-)

ON/OFF

Vout (+)

Vout (-)

TRIM

SENSE (+)

SENSE (-) RT-DECR

(Top View)

SQE48 Converter

ZD-01745_1.1_September-10-2013 7 www.power-one.com

DATA SHEET

3.5 SAFETY REQUIREMENTS

The converters meet North American and International safety regulatory requirements per UL60950 and EN60950. Basic

Insulation is provided between input and output.

The converters have no internal fuse. If required, the external fuse needs to be provided to protect the converter from cata-

strophic failure. Refer to the “Input Fuse Selection for DC/DC converters” application note on www.power-one-com for proper

selection of the input fuse. Both input traces and the chassis ground trace (if applicable) must be capable of conducting a

current of 1.5 times the value of the fuse without opening. The fuse must not be placed in the grounded input line.

Abnormal and component failure tests were conducted with the input protected by a TBD fuse. If a fuse rated greater than

TBD A is used, additional testing may be required. To protect a group of converters with a single fuse, the rating can be in-

creased from the recommended value above.

3.6 ELECTROMAGNETIC COMPATIBILITY (EMC)

EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics

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 disturbance charac-

teristics-Limits and methods of measurement.

An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC.

With the addition of a simple external filter, the SQE48T40015 converter passes the requirements of Class B conducted

emissions per EN55022 and FCC requirements. Contact Power-One Applications Engineering for details of this testing.

3.7 STARTUP INFORMATION (USING NEGATIVE ON/OFF)

Scenario #1: Initial Startup From Bulk Supply

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

Time

Comments

ON/OFF pin is ON; system front-end power is toggled on, VIN to converter begins to rise.

VIN crosses undervoltage Lockout protection circuit threshold; converter enabled.

Converter begins to respond to turn-on command (converter turn-on delay).

Converter VOUT reaches 100% of nominal value.

For this example, the total converter startup time (t3- t1) is typically 3 ms.

Fig. E: Startup scenario #1.

VIN

ON/OFF

STATE

VOUT

t0t1t2t3

OFF

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DATA SHEET

Scenario #2: Initial Startup Using ON/OFF Pin

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

Time

Comments

VINPUT at nominal value.

Arbitrary time when ON/OFF pin is enabled (converter enabled).

End of converter turn-on delay.

Converter VOUT reaches 100% of nominal value.

For this example, the total converter startup time (t3- t1) is typically 3 ms.

Fig. F: Startup scenario #2.

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

With VIN previously powered, converter is disabled and then enabled via ON/OFF pin. See Figure G.

Time

Comments

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

ON/OFF pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period

(200 ms typical) is initiated, and ON/OFF pin action is internally inhibited.

ON/OFF pin is externally re-enabled.

If (t2- t1) ≤ 200 ms, external action of ON/OFF pin is locked out by startup inhibit

timer.

If (t2- t1) > 200 ms, ON/OFF pin action is internally enabled.

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.

End of converter turn-on delay.

Converter VOUT reaches 100% of nominal value.

For the condition, (t2- t1) ≤ 200 ms, the total converter startup time (t5- t2) is typically 203 ms. For (t2- t1) >

200 ms, startup will be typically 3 ms after release of ON/OFF pin.

Fig. G: Startup scenario #3.

ON/OFF

STATE

VOUT

t0t1t2t3

OFF

VIN

ON/OFF

STATE

OFF

OUT

200 ms

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DATA SHEET

4 CHARACTERIZATION

4.1 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, startup and shutdown parame-

ters, output ripple and noise, transient response to load step-change, overload, and short circuit.

The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data

are provided below.

4.2 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, comprised of two-ounce copper,

were used to provide traces for connectivity to the converter.

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 purposes.

All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography

and thermocouples for thermometry.

Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one antici-

pates 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. Thermographic imaging is preferable; if this capability is not available, then ther-

mocouples may be used. The use of AWG #40 gauge thermocouples is recommended to ensure measurement accuracy.

Careful routing of the thermocouple leads will further minimize measurement error. Refer to Fig. H for the optimum measur-

ing thermocouple locations.

4.3 THERMAL DERATING

Load current vs. ambient temperature and airflow rates are given in Figure 1. 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 temperature of 120 ° C as indicat-

ed by the thermographic image, or

(ii) The temperature of the transformer does not exceed 120 ° C, or

(iii) The nominal rating of the converter (40 A at 1.5 V).

During normal operation, derating curves with maximum FET temperature less or equal to 120 ° C should not be exceeded.

Temperature at both thermocouple locations shown in Fig. H should not exceed 120 ° C in order to operate inside the derat-

ing curves.

Fig. H: Locations of the Thermocouple for Thermal Testing.

4.4 EFFICIENCY

Figure 2 shows the efficiency vs. load current plot for ambient temperature of 25 ºC, airflow rate of 300 LFM (1.5 m/s) with

vertical mounting and input voltages of 36 V, 48 V, 54 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 Figure 3.

SQE48T40015 DC-DC Converter 10 www.power-one.com

DATA SHEET

4.5 POWER DISSIPATION

Figure 4 shows the power dissipation vs. load current plot for Ta = 25 ºC, airflow rate of 300 LFM (1.5 m/s) with vertical

mounting and input voltages of 36 V, 48 V, 54 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 Figure 5.

4.6 STARTUP

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 Figure 6 and Figure 7, respectively.

4.7 RIPPLE AND NOISE

Figure 10 shows the output voltage ripple waveform, measured at full rated load current with a 10 µ F tantalum and 1 µ F

ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 µ F ceramic capacitor.

The input reflected-ripple current waveforms are obtained using the test setup shown in Figure 11. The corresponding wave-

forms are shown in Figure 12 and Figure 13.

Figure 1. Available load current vs. ambient air temperature and Figure 2. Efficiency vs. load current and input voltage for

airflow rates for SQE48T40015 converter mounted vertically with SQE48T40015 converter mounted vertically with air flowing

air flowing from pin 3 to pin 1, MOSFET temperature



120



C, from pin 3 to pin 1 at 300 LFM (1.5 m/s) and Ta=25



Vin = 48 V. Note: NC – Natural convection

Figure 3. Efficiency vs. load current and ambient temperature Figure 4. Power dissipation vs. load current and input voltage

for SQE48T40015 converter mounted vertically with Vin=48V for SQE48T40015 converter mounted vertically with air flowing

and air flowing from pin 3 to pin 1 at 200LFM (1.0m/s). from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25



20 30 40 50 60 70 80 90

Ambient Temperature, C

Load Current, A

NC ~ 30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

200 LFM (1 m/s)

300 LFM (1.5 m/s)

400 LFM (2 m/s)

500 LFM (2.5 m/s)

010 20 30 40

Load Current, A

Efficiency, %

36V

48V

54V

72V

010 20 30 40

Load Current, A

Efficiency, %

40C

55C

70C

85C

2.5

7.5

010 20 30 40

Load Current, A

Power Dissipation, W

36V

48V

54V

72V

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DATA SHEET

Figure 5. Power dissipation vs. load current and ambient temperature Figure 6. Turn-on transient at full rated load current (resistive) with

for SQE48T40015 converter mounted vertically with Vin = 48 V and no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top

air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). trace: ON/OFF signal (5 V/div.). Bottom trace: Output voltage

(0.5 V/div.). Time scale: 5 ms/div.

Figure 7. Turn-on transient at full rated load current (resistive) plus Figure 8. Output voltage response to load current step-change

10,000 µ F at Vin = 48 V, triggered via ON/OFF pin. Top trace: (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output voltage

ON/OFF signal (5 V/div.). Bottom trace: Output voltage (0.5 V/div.). (100 mV/div.). Bottom trace: load current (10 A/div.). Current

Time scale: 5 ms/div. slew rate: 0.1 A/µ s. Co = 1 µ F ceramic. Time scale: 0.2ms/div.

Figure 9. Output voltage response to load current step-change Figure 10. Output voltage ripple (20 mV/div.) at full rated load

(20 A – 30 A –20A) at Vin = 48 V. Top trace: output voltage current into a resistive load with Co = 10 µ F tantalum + 1 µ F

(200 mV/div.). Bottom trace: load current (10 A/div.). Current ceramic and Vin = 48 V. Time scale: 1 µ s/div.

slew rate: 2.5 A/µ s. Co = 470 µ F POS + 1 µ F ceramic. Time

scale: 0.2 ms/div.

2.5

7.5

010 20 30 40

Load Current, A

Power Dissipation, W

40C

55C

70C

85C

SQE48T40015 DC-DC Converter 12 www.power-one.com

DATA SHEET

Figure 11. Test setup for measuring input reflected ripple currents, ic and is.

Figure 12. Input reflected-ripple current, iS (10 mA/div.), measured Figure 13. Input reflected ripple-current, iC (100 mA/div.), measured

through 10 µ H at the source at full rated load current and Vin = 48 V. at input terminals at full rated load current and Vin = 48 V.

Refer to Figure 11 for test setup. Time scale: 1 µ s/div. Refer to Figure 11 for test setup. Time scale: 1 µ s/div.

Figure 14. Output voltage vs. load current showing current limit Figure 15. Load current (top trace, 50 A/div., 50 ms/div.) into a

point and converter shutdown point. Input voltage has almost no 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace

effect on current limit characteristic. (50 A/div., 5 ms/div.) is an expansion of the on-time portion of

the top trace.

Vout

Vsource

iSiC

1 F

ceramic

capacitor

10 H

source

inductance DC-DC

Converter

33 F

ESR < 1

electrolytic

capacitor



SQE48

ZD-01745_1.1_September-10-2013 13 www.power-one.com

DATA SHEET

5 PHYSICAL INFORMATION

5.1 SQE48T PINOUT (THROUGH-HOLE)

5.2 CONVERTER PART NUMBERING/ORDERING INFORMATION

PRODUCT

SERIES

INPUT

VOLTAGE

MOUNTING

SCHEME

RATED

CURRENT

OUTPUT

VOLTAGE

ON/OFF

LOGIC

MAXIMUM

HEIGHT

[HT]

LENGTH

[PL]

SPECIAL

FEATURES

RoHS

SQE

015

One-

Eighth

Brick

Format

36-75 V

T 

Through-

hole

40 

40 ADC

015  1.5

N 

Negative

P 

Positive

D  0.374”

Through

hole

A  0.188”

B  0.145”

C  0.110”

0  2250VDC

isolation, no

CM cap

K 

1500VDC

isolation, CM

cap, and

special OCP

5.3 No Suffix 

RoHS

lead-solder-

exemption com-

pliant

G  RoHS

compliant for all

six substances

The example above describes P/N SQE48T40015-NDAKG: 36-75 V input, through-hole, 40A @ 1.5V output, negative ON/OFF logic,

maximum height of 0.374”, 0.188” pins, 1500VDC isolation, common mode capacitor, special OCP, and RoHS compliant for all 6 sub-

stances. Consult factory for availability of other options.

MAXIMUM MODULE

HEIGHT

0.407 [10.34]

ALL DIMENSIONS ARE IN INCHES

DIMENSIONS IN BRACKETS [ ] ARE IN MILLIMETERS

CODE CLEARENCE OFF

USER BOARD

0.035 [0.89]

CL -0.00

+0.41+0.016

-0.000 PIN INTERCONNECT

LENGTH

+0.000

-0.038 -0.97

+0.00

0.145 [3.68]

0.188 [4.77]

+0.005

-0.005 +0.13

-0.13

FUNCTION

PAD/PIN CONNECTIONS

PIN #

1SQE48T Platform Notes:

- All dimensions are in inches [mm]

- Pins 1-3 and 5-7 are ? .040" [1.02]

with ? .078 [1.98] shoulder

- Pins 4 and 8 are ? 062" [1.57]

without shoulder

- Pin Material: CDA 145

- Connector Finish: Tin over Nickel

Vin (+)

ON/OFF

Vin (-)

Vout (-)

SENSE (-)

TRIM

SENSE (+)

Vout (+)

TOP VIEW

SIDE VIEW

PAD/PIN CONNECTIONS

PAD/PIN #

FUNCTION

Vin (+)

ON/OFF

Vin (-)

Vout (-)

SENSE(-)

TRIM

SENSE(+)

Vout (+)

HEIGHT

OPTION

(Max. Height)

(Min. Clearance)

+0.000 [+0.00]

-0.038 [- 0.97]

+0.016 [+0.41]

-0.000 [- 0.00]

0.374 [9.5]

0.045 [1.14]

Option

Pin Length

± 0.005 [± 0.13]

0.188 [4.78]

0.145 [3.68]

0.110 [2.79]

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

tems, 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. Speci-

fications are subject to change without notice.

SQE48T Platform Notes

 All dimensions are in inches [mm]

 Pins 1-3 and 5-7 are Ø 0.040” [1.02]

with Ø 0.078” [1.98] shoulder

 Pins 4 and 8 are Ø 0.062” [1.57]

without shoulder

 Pin Material: Brass Alloy 360

 Pin Finish: Tin over Nickel