background image

GLOBAL ENERGY EFFICIENCY SPECIALIST 

Copyright© 2012 Huawei Technologies Co., Ltd. All Rights Reserved. 

 

THIS DOCUMENT IS FOR INFORMATION PURPOSE ONLY, AND DOES NOT CONSTITUTE ANY KIND OF WARRANTIES. 

Description

 

The GAQ40S3V3B is a new generation isolated 

DC-DC converter that uses an industry standard 

quarter-brick structure, and features high 

efficiency and power density, operates from an 

input voltage range of 36 V to 75 V,  provides the 

rated output voltage of 3.3 V and the maximum 

output current of 40 A.  

Control Features 

Remote on/off 

Remote sense 

Output voltage trim 

Protection Features 

Input undervoltage protection 

Output overcurrent protection  (hiccup mode) 

Output short circuit protection  (hiccup mode) 

Output overvoltage protection  (hiccup mode) 

Overtemperature protection     (self-recovery) 

Safety Features

 

UL60950-1 and CSA C22.2 No. 60950-1-07 

Meet UL94V-0 flammability requirements 

RoHS6 compliant 
 

Operational Features 

Input voltage: 36 - 75 V 

Output current: 0 - 40 A 

Low output ripple and noise 

Efficiency: 93.5% (3.3 V, 40 A) 

GAQ40S3V3B 

Quarter-Brick  

DC-DC Converter 

36 - 75 V 

Input 

3.3 V Output 

40 A Current 

Negative 

Logic 

GAQ40S3V3B  
DC-DC Converter Technical Manual V1.4 

Mechanical Features 

Industry standard quarter-brick (D x W x H, 

with a baseplate): 57.9 mm x 36.8 mm x 12.7 

mm (2.28 in. x 1.45 in. x 0.50 in.) 

Weight

: about 

58 

Summary of Contents for GAQ40S3V3B

Page 1: ...ltage trim Protection Features Input undervoltage protection Output overcurrent protection hiccup mode Output short circuit protection hiccup mode Output overvoltage protection hiccup mode Overtemperature protection self recovery Safety Features UL60950 1 and CSA C22 2 No 60950 1 07 Meet UL94V 0 flammability requirements RoHS6 compliant Operational Features Input voltage 36 75 V Output current 0 4...

Page 2: ...0 004 in diameter standoff shoulders 3 M3 Screw used to bolt unit s baseplate to other surfaces such as heatsink must not exceed 3 00 mm 0 120 in depth below the surface of baseplate GAQ40S3V3B DC DC Converter Technical Manual V1 4 GAQ 40 S 3V3 B 1 2 3 4 5 Pin Description 1 48Vin high performance analog control quarter brick 2 Output current 40 A 3 Single output 4 Output voltage 3 3 V 5 With a bas...

Page 3: ...rent peak to peak 20 mA Oscilloscope bandwidth 20 MHz Output characteristics Output voltage set point 3 25 3 3 3 35 V Vin 36 75 V Iout 40 A Output power 0 132 W Output line regulation 0 20 Vin 36 75 V Iout 40 A Output load regulation 0 30 Vin 48 V Iout 0 40 A Regulated voltage precision 3 Vin 36 75 V Iout 0 40 A Temperature coefficient 0 02 Vout C TA 40 C to 85 C 40 F to 185 F External capacitance...

Page 4: ...istics Overshoot amplitude Recovery time 100 100 mV µs Current change rate 0 1 A µs load 25 50 25 50 75 50 Overshoot amplitude Recovery time 180 320 mV µs Current change rate 1 A µs load 25 50 25 50 75 50 Efficiency 100 load 91 0 93 5 Vin 48 V Iout 40 A TA 25 C 77 F 50 load 88 0 93 5 Vin 48 V Iout 20 A TA 25 C 77 F 20 load 75 0 87 5 Vin 48 V Iout 8 A TA 25 C 77 F Isolation characteristics Input to...

Page 5: ...hnical Manual V1 4 Figure 1 Efficiency TA 25 C or 77 F Figure 2 Power dissipation TA 25 C or 77 F Characteristic Curves Figure 3 Thermal derating with airflow from Vin to Vout Vin 48 V Vout 3 3 V Figure 4 Thermal derating with airflow from Vin to Vin Vin 48 V Vout 3 3 V ...

Page 6: ...ytic capacitor 2 Point B which is for testing the output voltage ripple is 25 mm 0 98 in away from the Vout pin 25 mm 0 98 in 12 µH DC DC converter A B 47 µF Electrolytic capacitor 10 µF Tantalum capacitor 470 µF Tantalum capacitor 0 1 µF Ceramic capacitor Vin Vin Vout Vout Vsource 220 µF Electrolytic capacitor Figure 6 Typical circuit applications F1 7 A fuse fast blowing Cin The high frequency l...

Page 7: ...down by power off Vout Vout Vin Vin Figure 9 Startup from On Off Figure 10 Shutdown from On Off Conditions TA 25 C 77 F Vin 48 V Vout On Off Vout On Off Typical Waveforms Iout Vout Vout Iout Figure 13 Output voltage dynamic response Load 25 50 25 di dt 0 1 A µs Figure 14 Output voltage dynamic response Load 50 75 50 di dt 0 1 A µs ...

Page 8: ... The output voltage can be decreased by installing an external resistor between the Trim pin and the Sense pin Figure 18 Configuration diagram for Trim down The relationship between Radj down and Vout Vin On Off Vin Vout Sense Trim Sense Vout Radj down Load 2 10 510 kohm R down adj 100 nom down trim nom V V V Simple control On Off Vin On Off Vin On Off Vin On Off Vin Transistor control Isolation c...

Page 9: ...otection The converter will shut down after the input voltage drops below the undervoltage protection threshold for shutdown The converter will start to work again after the input voltage reaches the input undervoltage protection threshold for startup For the Hysteresis see the Protection characteristics Output Overcurrent Protection The converter equipped with current limiting circuitry can provi...

Page 10: ... under lowest load power Qualification Testing Sufficient airflow should be provided to ensure reliable operating of the converter Therefore thermal components are mounted on the top surface of the converter to dissipate heat to the surrounding environment by conduction convection and radiation Proper airflow can be verified by measuring the temperature at the middle of the baseplate The temperatu...

Page 11: ... 518129 People s Republic of China www huawei com The converter is compatible with standard wave soldering techniques When wave soldering the converter pins should be preheated for 20 30 seconds at 110 C 230 F and wave soldered at 260 C 500 F for less than 10 seconds When hand soldering the iron temperature should be maintained at 425 C 797 F and applied to the converter pins for less than 5 secon...

Reviews: