Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 1
Technical
Specification
PQ60120QTx12
PQ60120QTx12 Module
Operational Features
Protection Features
Control Features
Safety Features
Contents
Mechanical Features
The PQ60120QTx12 PowerQor Tera quarter-brick
converter is a next-generation, board-mountable, isolated,
xed switching frequency DC/DC converter that uses
synchronous rectication to achieve extremely high
conversion efciency. The power dissipated by the converter
is so low that a heatsink is not required, which saves cost,
weight, height, and application effort. All of the power and
control components are mounted to the multi-layer PCB
substrate with high-yield surface mount technology. Since
the PowerQor converter has no explicit thermal interfaces,
it is extremely reliable. The Tera series offers the maximum
useable output current for any standard “quarter-brick”
module.
• Ultra-high efciency, 91% at full rated load current
• Delivers up to 12A of output current (144W) with minimal derating
- no heatsink required
• Wide input voltage range: 35V - 75V, with 100V 100ms
input voltage transient capability
• Fixed frequenc switching provides predictable EMI performance
• No minimum load requirement means no preload resistors required
• On/Off control referenced to input side
(positive and negative logic options are available)
• Remote sense for the Vout compensates for output distribution drops
• Output voltage trim permits custom voltages and voltage margining
• Input under-voltage lockout disables converter at low Vin conditions
• Output current limit and short circuit protection protects converter and
load from permanent damage and consequent hazardous conditions.
• Active back bias limit prevents damage to converter from
external load induced pre-bias
• Output over-voltage protection protects load form damaging voltages
• Thermal shutdown protects converter from
48V 35-75V 12V 144W 2000V dc Quarter-brick
Input Continuous Input Output Max Power Isolation DC/DC Converter
• Industry standard quarter-brick pin-out
• Size: 1.45” x 2.3” (36.8x58.4mm), height: 0.43” (10.92mm)
• Total open frame weight: 1.5 oz (42 g)
• UL 60950-1:2007
• CAN/CSA-C22.2 No. 60950-1:2007
• EN60950-1:A12:2011
• IEC 61000-4-2
Page No.
Mechanical Diagrams..................................... 2
Electrical Characteristics................................... 4
Figures............................................... 6
Application Section ......................................10
Ordering Information.....................................15
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 2
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Mechanical Diagrams
Open Frame Mechanical Diagram
1.45 [36.8]
.145 [3.68]
See Note 3
.060+.022/-.32
[1.52+.55/-.81mm]
Bottomside
Clearance
.600
[15.24]
.600 [15.24]
Pin Farside Typical
See Notes 1,2, and 4
.450
[11.43]
.43 [10.9]
.43 [10.9]
.14 [3.6]
2.00 [50.8]
2.30 [58.4]
.150 [3.81] .300
[7.62]
.300 [7.62]
8 7 6 5 4
Top View Side View
123
NOTES
1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter
with 0.080” (2.03 mm) diameter standoff shoulders.
2) Pins 4,8 are 0.062” (1.57 mm) diameter
with 0.100” (2.54 mm) diameter standoff shoulders.
3) Other pin lengths available.
4) All Pins: Material - Copper Alloy
Finish: Matte Tin-Lead over Nickel plate
5) Undimensioned components are shown for visual reference only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 1.5 oz (42 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance of 0.04” (1.02mm)
around primary areas of the module.
10) The anged pins are designed to permit surface mount soldering
(allowing to avoid the wave soldering process)
through the use of the anged pin-in-paste technique.
PIN DESIGNATIONS
Pin Name Function
1 Vin(+) Positive input voltage
2 ON/OFF Logic control input to turn converter on/off.
3 Vin(–) Negative input voltage
4 Vout(–) Negative output voltage
5 Vout(+) Negative remote sense (see note 1)
6 Vout(+) Output voltage trim (see note 2)
7 Vout(+) Positive remote sense (see note 3)
8 Vout(+) Positive output voltage
Notes:
1. SENSE(-) may be connected to Vout(-) or left open.
2. Leave TRIM pin open for nominal output voltage.
3. SENSE(+) may be connected to Vout(+) or left open.
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 3
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Baseplated Mechanical Diagram
PIN DESIGNATIONS
Pin Name Function
1 Vin(+) Positive input voltage
2 ON/OFF Logic control input to turn converter on/off.
3 Vin(–) Negative input voltage
4 Vout(–) Negative output voltage
5 Vout(+) Negative remote sense (see note 1)
6 Vout(+) Output voltage trim (see note 2)
7 Vout(+) Positive remote sense (see note 3)
8 Vout(+) Positive output voltage
Notes:
1. SENSE(-) may be connected to Vout(-) or left open.
2. Leave TRIM pin open for nominal output voltage.
3. SENSE(+) may be connected to Vout(+) or left open.
1.47 [37.3]
.145 [3.68]
See Note 4
.060+.022/-.32
[1.52+.55/-.81mm]
Bottomside
Clearance
.600
[15.24]
.600 [15.24]
Pin Farside Typical
See Notes 5, 6, and 7
M3 Threaded Insert
4 places
See Notes 1 and 2
.450
[11.43]
.50 [12.7]
.44 [11.2]
.15
[3.8]
.23
[5.8]
2.00 [50.8]
2.32 [58.9]
.150 [3.81] .300
[7.62]
.300 [7.62]
8 7 6 5 4
Top View Side View
123
NOTES
1) M3 screws used to bolt unit's baseplate to other surfaces such as
heatsinks must not exceed 0.85" depth below the surface
of the baseplate.
2) Applied torque per screw should not exceed 6in-lb (0.7Nm).
3) Baseplate atness tolerance is 0.004" (.10mm) TIR for surface.
4) Other pin extension lengths available.
5) Pins 1-3, 5-7 are 0.040" (1.02mm) dia.
with 0.080" (2.03mm) dia. standoff shoulders
6) Pins 4,8 are 0.062" (1.57mm) dia.
with 0.100" (2.54mm) dia.standoff shoulders
7) All pins: Material: Copper Alloy
Finish: Matte Tin-Lead over Nickel plate
8) Undimensioned components are shown for visual reference only
9) All dimensions in inches(mm)
Tolerances: x.xxin +/-0.02 (x.xmm +/-0.5mm)
x.xxxin +/-0.010 (x.xxmm +/-0.25mm)
10)
Weight: 2.7 oz (78 g) typical
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 4
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
PQ60120QTx12 Electrical Characteristics
Ta = 25 °C, airow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature
with appropriate power derating. Specications subject to change without notice."
Parameter Min. Typ. Max. Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating -1 100 V Continuous
Operating 80 V Continuous
Operating Transient Protection 100 V 100ms transient, square wave
Isolation Voltage
Input to Output 2000
Operating Temperature -40 100 °C
Storage Temperature -55 125 °C
Voltage at ON/OFF input pin -2 18 V
INPUT CHARACTERISTICS
Operating Input Voltage Range 35 48 75 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 32.0 33.0 34.0 V
Turn-Off Voltage Threshold 28.5 29.5 30.5 V
Lockout Voltage Hysteresis 2.5 3.5 4.5 V
Maximum Input Current 5.1 A 100% Load, 35V Vin
No-Load Input Current 80 120 mA
Disabled Input Current 1.6 3 mA
Inrush Current Transient Rating 0.01 A2s
Response to Input Transient 500 mV 1000V/ms input transient
Input Reected Ripple Current 5 mA RMS thru 10μH inductor
Input Terminal Ripple Current 170 mA RMS; Figures 13 & 14
Recommended Input Fuse 7 A Fast blow external recommended
Input Filter Component Values (L\C) 3.3\6.6 µF Internal values, See Figure E
Recommended External Input Capacitance 47 µH\µF Typical ESR 0.1-0.2, see Figure 13
OUTPUT CHARACTERISTICS
Output Voltage Set Point 11.82 12.00 12.18 V
Output Voltage Regulation
Over Line +0.05 \ 5 0.2 \ 24 %/mV
Over Load +0.05 \ 5 0.2 \ 24 %/mV
Over Temperature ±90 ±240 mV
Total Output Voltage Range 11.58 12.42 V Over sample, line, load, temperature & life
Output Voltage Ripple and Noise 500MHz bandwidth; Figures 13 & 16
Peak-to-Peak 75 150 mV Full Load, see Figures 13 & 16
RMS 15 30 mV Full Load, see Figures 13 & 16
Operating Output Current Range 0 12.0 A Subject to thermal derating; Figures 5-8
Output DC Current-Limit Inception 13.6 A Output Voltage 10% Low
Output DC Current-Limit Shutdown Voltage 7.0 V
Back-Drive Current Limit while Enabled 0.1 0.3 1.0 A Negative current drawn from output
Back-Drive Current Limit while Disabled 0 10 50 mA Negative current drawn from output
Maximum Output Capacitance 6.0 mF 12Vout at 12.0A Resistive Load
EFFICIENCY
100% Load 91 % Figures 1 - 4
50% Load 91 % Figures 1 - 4
Technical Specifications
Electrical Characteristics
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 5
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
PQ60120QTx12 Electrical Characteristics (continued)
Ta = 25 °C, airow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature
with appropriate power derating. Specications subject to change without notice.
Parameter Min. Typ. Max. Units Notes & Conditions
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection 55 dB 120 Hz; Figure 20
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs) 600 mV 50% to 75% to 50% Iout max, Figue 11
For a Step Change in Output Current (1A/µs) 250 mV 50% to 75% to 50% Iout max; Figure 12
Settling time 500 µs To within 1% Vout nom
Turn-On Transient
Turn-On Time 7 10 14 ms Full load, Vout=90% nom; Figures 9 & 10
Output Voltage Overshoot 5 % 6 mF load capacitanc, Iout = 0A
Start-Up Inhibit Time 200 220 240 ms -40˚C to +125˚C; Figure F
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength) 2000 V
Isolation Resistance 30 MΩ
Isolation Capacitance (input to output) 470 pF
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature 125 °C Package rated to 150°C
Board Temperature 125 °C UL rated max operating temp 130°C
Transformer Temperature 125 °C See Figures 5-8 for derating curves
FEATURE CHARACTERISTICS
Switching Frequency 200 240 280 kHz Regulation and Isolation stage
ON/OFF Control (Option P)
Off-State Voltage -2 0.8 V
On-State Voltage 2.4 18 V
ON/OFF Control (Option N)
Off-State Voltage 2.4 18 V
On-State Voltage -2 0.8 V
ON/OFF Control (Either Option) Figures A, B
Pull-Up Voltage Vin/6.5 9.20 V
Pull-Up Resistance 40 kΩ
Output Voltage Trim Range -20 10 % Measured across Pins 8 & 4; Figures 23 & C
Output Voltage Remote Sense Range 10 % Measured across Pins 8 & 4
Output Over-Voltage Protection 117 122 127 % Over Full Temperature Range; % of nominial Vout
Over-Temperature Shutdown 125 °C Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis 10 °C
Load Current Scale Factor 500 See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) 2.1 106 Hrs. TR-NWT-000332; 80% load, 300LFM, 40°C Ta
Calculated MTBF (MIL-217) 1.75 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40°C Ta
Field Demonstrated MTBF 106 Hrs. See our website for details
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 2: Higher values of isolation capacitance can be added external to the module.
Technical Specifications
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 6
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
65
70
75
80
85
90
95
100
0 2 4 6 8 10 12
Load Current (A)
Efficiency (%)
35 Vin
48 Vin
75 Vin
88
89
90
91
92
93
94
0 100 200 300 400 500
Air Flow (LFM)
Efficiency (%)
25 C
40 C
55 C
0
2
4
6
8
10
12
14
16
0 2 4 6 8 10 12
Load Current (A)
Power Dissipation (W)
35 Vin
48 Vin
75 Vin
3
4
5
6
7
8
9
0 100 200 300 400 500
Air Flow (LFM)
Power Dissipation (W)
25 C
40 C
55 C
0
1
2
3
4
5
6
7
8
9
10
11
12
0 25 40 55 70 85
Ambient Air Temperature (oC)
Iout (A)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figures
Figure 1: Efciency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Efciency at nominal output voltage and 60% rated power vs. airow
rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input
voltage).
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Figure 4: Power dissipation at nominal output voltage and 60% rated power
vs. airow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal
input voltage).
Figure 5: Maximum output power derating curves vs. ambient air temperature
for airow rates of 0 LFM through 400 LFM with air owing across the
converter from input to output (nominal input voltage).
Figure 6: Thermal plot of converter at 11.2 amp load current (134W) with 55°C
air owing at the rate of 200 LFM. Air is owing across the converter from
input to output (nominal input voltage).
Technical Figures
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 7
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
0
1
2
3
4
5
6
7
8
9
10
11
12
0 25 40 55 70 85
Ambient Air Temperature (
o
C)
I
out
(A)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 7: Maximum output power derating curves vs. ambient air temperature
for airow rates of 0 LFM through 400 LFM with air owing from pin 1 to pin 3
(nominal inout voltage).
Figure 8: Thermal plot of converter at 11.6 amp load current (139W) with 55°C
air owing at the rate of 200 LFM. Air is owing from pin 1 to pin 3 (nominal
input voltage).
Figure 9: Turn-on transient at full load (resistive load) (10 ms/div). Input
voltage pre-applied. Ch 1: Vout (5V/div). Ch 2: ON/OFF input (5V/div)
Figure 10: Turn-on transient at zero load (10 ms/div). Ch 1: Vout (5V/div) Ch 2:
ON/OFF input (5V/div)
Figure 11: Output voltage response to step-change in load current (50%-75%-
50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 10µF, 100 mΩ ESR tantalum
capacitor and 1µF ceramic capacitor. Ch 1: Vout (500mV/div), Ch 2: Iout (5A/
div).
Figure 12: Output voltage response to step-change in load current (50%-75%-
50% of Iout(max): dI/dt = 1A/µs). Load cap: 470µF, 30 mΩ ESR tantalum
capacitor and 1µF ceramic cap. Ch 1: Vout (500V/div), Ch 2: Iout (5A/div).
Technical Figures
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 8
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
source
impedance
DC-DC
Converter
Input
Terminal
Ripple
Current
Input
Reflected
Ripple
Current Output
Voltage
Ripple
ceramic
capacitor
tantalum
capacitor
electrolytic
capacitor
VSOURCE
VOUT
iSiC
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14 16
Load Current (A)
Output Voltage (V)
35 V
48 V
75 V
Figure 13: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 14), Input Reected Ripple Current (Figure 15) and
Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10µH source impedance and 47µF electrolytic
capacitor (200 mA/div). (See Figure 13)
Figure 15: Input reected ripple current, is, through a 10 µH source inductor at
nominal input voltage and rated load current (5 mA/div). See Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated load current
(50 mV/div). Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 500 MHz. See Figure 13.
Figure 17: Output voltage vs. load current showing typical current limit curves
and converter shutdown pints.
Figure 18: Load current (5A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (2ms/div) is an
expansion of the on-time portion of the bottom trace.
Technical Figures
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 9
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
0.0001
0.001
0.01
0.1
1
10 100 1,000 10,000 100,000 1,000,000
Hz
Output Impedance
(Ω)
35 Vin
48 Vin
75 Vin
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000
Hz
Forward Transmission
(dB)
35 Vin
48 Vin
75 Vin
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
10 100 1,000 10,000 100,000
Hz
Reverse Transmission
(dB)
35 Vin
48 Vin
75 Vin
0.1
1
10
100
10 100 1,000 10,000 100,000
Hz
Input Impedance
(Ω)
35 Vin
48 Vin
75 Vin
0
1
2
3
4
5
6
7
8
9
10
40.0 39.5 39.0 38.5 38.0 37.5 37.0 36.5 36.0 35.5 35.0
Input Voltage (V)
V
out
Trim-up (%)
100% Load
50% Load
0% Load
Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 23: Percentage of output voltage trim-up that can be achieved at various
input voltages frm 35V-40V and output loads of 0%, 50% and full load.
Technical Figures
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 10
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Application Section
Application Section
Open Collector Enable Circuit
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently
Enabled)
(Permanently
Enabled)
ON/OFF
Vin(_)
ON/OFF
ON/OFF
Vin(_)
ON/OFF
5V
TTL/
CMOS
Vin(_)
Vin(_)
Positive Logic
ON/OFF
Vin(_)
BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power conver-
sion topology. The first stage is a buck-converter that keeps the
output voltage constant over variations in line, load, and tempera-
ture. The second stage uses a transformer to provide the functions
of input/output isolation and voltage step-down to achieve the
low output voltage required.
Both the first stage and the second stage switch at a fixed fre-
quency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous rectifiers.
These devices, which are MOSFETs with a very low on-state
resistance, dissipate far less energy than Schottky diodes. This
is the primary reason that the PowerQor converter has such high
efficiency, even at very low output voltages and very high output
currents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not required,
the PowerQor converter does not need a metal baseplate or
potting material to help conduct the dissipated energy to the
heatsink. The PowerQor converter can thus be built more simply
and reliably using high yield surface mount techniques on a PCB
substrate.
The PowerQor series of half-brick and quarter-brick converters
uses the industry standard footprint and pin-out.
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is
referenced to the return terminal of the input bus, Vin(-). There are
two versions of the converter that differ by the sense of the logic
used for the ON/OFF input.
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter on). In the negative logic
version, the ON/OFF signal is active low (meaning that a low turns
the converter on). Figure A details five possible circuits for driving
the ON/OFF pin. Figure B is a detailed look of the internal ON/
OFF circuitry.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs cor-
rect for voltage drops along the conductors that connect the con-
verter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 should be connect-
ed to Vout(-) at the point on the board where regulation is desired.
A remote connection at the load can adjust for a voltage drop only
as large as that specified in this datasheet, that is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 7 and 5 must be connected for proper regulation of the output
voltage. If these connections are not made, the converter will deliver
an output voltage that is slightly higher than its specified value.
Note: the output over-voltage protection circuit senses the voltage
across the output (pins 8 and 4) to determine when it should trigger,
not the voltage across the converter’s sense leads (pins 7 and 5).
Therefore, the resistive drop on the board should be small enough so
that output OVP does not trigger, even during load transients.
Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry
TTL
ON/OFF
Vin(_)
V
274k
50k
50k
5V
100pF
in(
+
)
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 11
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Application Section
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications.
To decrease the output voltage, the user should connect a resistor
between Pin 6 and Pin 5 (SENSE(-) input). For a desired decrease
of the nominal output voltage, the value of the resistor should be
Rtrim-down =
(
511%
-
10.22
)
kW
D%
where
D% =
Vnominal – Vdesired
x 100%
Vnominal
To increase the output voltage, the user should connect a resistor
between Pin 6 and Pin 7 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be
Rtrim-up
k
W
)
where
VOUT = Nominal Output Voltage
= (
_ 511% _ 10.22
5.11VOUT(100
%)
1.225D%D%
Figure C graphs the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
10
100
1,000
10,000
100,000
0 2 4 6 8 10 12 14 16 18 20
Trim Resistance (kOhms)
% increase Vout % decrease Vout
Figure C: Trim Graph
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection
circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally bypassed to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout,
due to both trimming and remote load voltage drops, should not
be greater than that specified for the output voltage trim range.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the appli-
cation note titled “Input System Instability”. The lockout circuitry
is a comparator with DC hysteresis. When the input voltage is
rising, it must exceed the typical Turn-On Voltage Threshold value
(listed on the specification page) before the converter will turn
on. Once the converter is on, the input voltage must fall below
the typical Turn-Off Voltage Threshold value before the converter
will turn off.
Output Current Limit: The maximum current limit remains
constant as the output voltage drops. However, once the imped-
ance of the short across the output is small enough to make the
output voltage drop below the specified Output DC Current-Limit
Shutdown Voltage, the converter turns off.
The converter then enters a “hiccup mode” where it repeatedly
turns on and off at a 5 Hz (nominal) frequency with a 5% duty
cycle until the short circuit condition is removed. This prevents
excessive heating of the converter or the load board.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the Output Over-Voltage Protection threshold, the
converter will immediately stop switching. This prevents dam-
age to the load circuit due to 1) excessive series resistance in
output current path from converter output pins to sense point, 2)
a release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions. After
200 ms the converter will automatically restart.
Over-Temperature Shutdown: A temperature sensor on the
converter senses the average temperature of the module. The ther-
mal shutdown circuit is designed to turn the converter off when the
temperature at the sensed location reaches the Over-Temperature
Shutdown value. It will allow the converter to turn on again when
the temperature of the sensed location falls by the amount of the
Over-Temperature Shutdown Restart Hysteresis value.
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 12
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Application Section
APPLICATION CONSIDERATIONS
Input System Instability: This
condition can occur because
any DC/DC converter appears incrementally as a negative
resistance load. A detailed application note titled “Input
System Instability” is available on the SynQor website which
provides an understanding of why this instability arises, and
shows the preferred solution for correcting it.
Application Circuits: Figure D below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Capacitance: Figure E below
provides a diagram showing the internal input filter components.
This filter dramatically reduces input terminal ripple current, which
otherwise could exceed the rating of an external electrolytic
input capacitor. The recommended external input capacitance
is specified in the “Input Characteristics” section. More detailed
information is available in the application note titled “EMI
Characteristics” on the
SynQor website
.
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Figure E: Internal Input Filter Diagram (component values listed on page 3).
C
L
Vin(+)
Vin(_)
Vin
External
Input
Filter
Trim
Vin(+)
Iload
Cload
Vout(+)
Rtrim-up
or
Rtrim-down
Vsense(+)
ON/OFF
Vin(_)Vout(_)
Vsense(_)
Electrolytic
Capacitor
47μF
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 13
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Application Section
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shut down for any reason. When an output short is present, this
generates a 5Hz “hiccup mode,” which prevents the converter
from overheating. In all, there are seven ways that the converter
can be shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
• Short Circuit Protection
• Turned off by the ON/OFF input
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, when the input voltage is below the UVL threshold,
the unit is disabled by the Input Under-Voltage Lockout feature.
When the input voltage rises above the UVL threshold, the Input
Under-Voltage Lockout is released, and a Startup Inhibit Period is
initiated. At the end of this delay, the ON/OFF pin is evaluated,
and since it is active, the unit turns on.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Figure F: Startup Inhibit Period (turn-on time not to scale)
Under-Voltage
Lockout Turn-
On Threshold
ON/OFF
(neg logic)
Vout
Vin
200ms 200ms
200ms
(typical start-up
inhibit period)
t0t1t2
t
10ms (typical turn on time)
ON ON ON
OFF OFF
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 14
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
Standards and Qualifications
Parameter Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2007 Basic insulation
CAN/CSA-C22.2 No. 60950-1:2007
EN60950-1:A12:2011
IEC 61000-4-2 ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for ofcial safety certicates on new
releases or download from the SynQor website.
Parameter # Units Test Conditions
QUALIFICATION TESTING
Life Test 32 95% rated Vin and load, units at derating point, 1000 hours
Vibration 5 10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock 5 100g minimum, 2 drops in x, y and z axis
Temperature Cycling 10 -40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Power/Thermal Cycling 5 Toperating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality 5 Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
Humidity 5 85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day
Solderability 15 pins MIL-STD-883, method 2003
Product # PQ60120QTx12 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QT612C Rev. C 07/24/12 Page 15
Input:
Output:
Current:
Package:
35-75V
12V
12A
Quarter-brick
PART NUMBERING SYSTEM
The part numbering system for SynQor’s dc-dc converters
follows the format shown in the example below.
The first 12 characters comprise the base part number and
the last 3 characters indicate available options. The “-G”
suffix indicates 6/6 RoHS compliance.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium,
Hexavalent Chromium, Mercury, Polybrominated Biphenyls
(PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical
and Electronic Equipment. This SynQor product is 6/6 RoHS
compliant. For more information please refer to SynQor’s
RoHS addendum available at our RoHS Compliance / Lead Free
Initiative web page or e-mail us at
rohs@synqor.com
.
ORDERING INFORMATION
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character
base part number and the additional characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
The following options must be included in place of the
w x y z
spaces in the model numbers listed above.
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for more
options.
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from SynQor.
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
Contact SynQor for further information:
Phone: 978-849-0600
Toll Free: 888-567-9596
Fax: 978-849-0602
E-mail: power@synqor.com
Web:
www.synqor.com
Address: 155 Swanson Road
Boxborough, MA 01719
USA
PATENTS
SynQor holds the following U.S. patents, one or more of which apply
to each product listed in this document. Additional patent applications
may be pending or led in the future.
5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520
6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146
7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702
7,765,687 7,787,261 8,023,290 8,149,597
PQ 60 120 Q T A 12 N R S
Product Family
Package Size
Performance Level
Thermal Design
Output Current
Options (see
Ordering Information)
Input Voltage
Output Voltage
Ordering Information
Model Number Input Voltage
Range
Output
Voltage
Max Output
Current
PQ60010QTA40xyz 35 - 75 V 1.0 V 40 A
PQ60012QTA40xyz 35 - 75 V 1.2 V 40 A
PQ60015QTA40xyz 35 - 75 V 1.5 V 40 A
PQ60018QTA40xyz 35 - 75 V 1.8 V 40 A
PQ60025QTA40xyz 35 - 75 V 2.5 V 40 A
PQ60033QTA35xyz 35 - 75 V 3.3 V 35 A
PQ60050QTA30xyz 35 - 75 V 5.0 V 30 A
PQ60120QTA12xyz 35 - 75 V 12 V 12 A
Options Description: w x y z
Thermal Design Enable Logic Pin Style Feature Set
A - Open Frame
B - Baseplated
N - Negative
P - Positive
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
Ordering Information
