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GS-EVB-HB-66508B-RN Technical Manual

_____________________________________________________________________________________________________________________

GS-EVB-HB-66508B-RN Rev. 210118 © 2021 GaN Systems Inc.

www.gansystems.com 8

Please refer to the Evaluation Board/Kit Important Notice on page 26

Figure 9 The daughter board with heatsink attached

CAUTION:

There is no on-board over-temperature protection. Device temperature must
be closely monitored during the test. Never operate the board with device
temperature exceeding T

J_MAX

(150

°

C)

Using GS-EVB-HB-66508B-RN with universal mother board GS665MB-EVB

Figure 10 650V universal mother board GS665MB-EVB

12V INPUT

(+)

5V Power Supply

CIN

VSW

PWM control & dead

time circuit

Daughter Board

Probing point for VSW

For Ext.

12VDC Fan

Airflow direction

Optional Cout

VDC-

VOUT

VDC-

VDC+

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Summary of Contents for GS-EVB-HB-66508B-RN

Page 1: ...al manual DANGER This evaluation kit is designed for engineering evaluation in a controlled lab environment and should be handled by qualified personnel ONLY High voltage will be exposed on the board during the test and even brief contact during operation may result in severe injury or death Never leave the board operating unattended After it is de energized always wait until all capacitors are di...

Page 2: ...t as there is no need a negative power supply rail And the reverse conduction voltage drop of GaN is lower For E mode GaN device the Vgs threshold voltage is low typ 1 7V 0V turn off has the risk of false turn on when the GaN device is in off state Also the switching off loss will be higher than negative turn off voltage The 0V turn off solution is normally used in the low power applications Featu...

Page 3: ... isolated 5V to 9V DC DC power supplies for top and bottom switches VDRV Not used VDRV can be connected to VCC though R43 R43 is DNP by default PWMH_IN High side PWM logic input for top switch Q1 It is compatible wth 3 3V and 5V PWML_IN Low side PWM logic input for bottom switch Q2 It is compatible wth 3 3V and 5V 0V Logic inputs and gate drive power supply ground return The 3 power pins are VDC I...

Page 4: ...ion Board Kit Important Notice on page 26 GS EVB HB 66508B RN half bridge daughter board Figure 2 GS EVB HB 66508B RN top side Figure 3 GS EVB HB 66508B RN bottom side A 2x GaN Systems 650V E HEMT GS66508B 30A 50mΩ B Decoupling capacitors C14 C17 and C47 C54 C Signal isolator IL611 1E D GaN driver RAA226110 E OCP shunt F TP8 gate and TP3 source test points for bottom Q2 VGS G 5V 9V isolated DC DC ...

Page 5: ...08B Gate driver circuit Renesas RAA226110 low side gate driver is chosen for this design This driver provides 5 8V gate drive with 3 8V UVLO It supports the 5 8V turn on and 3V 0V turn off It has separated source and sink drive outputs which eliminates the need for additional diode OCP is also integrated in the driver RAA226110 provides configurable source current 0 3A 0 75A 2A to adjust the slew ...

Page 6: ...ply Current shunt The board provides an optional current shunt position E figure2 between the source of Q2 and power ground return This allows drain current measurement for switching characterization test such as Eon Eoff measurement The current shunt is also used to provide the OCP signal for the RAA226110 to trigger OCP The OCP threchold voltage 40mV 80mV 120mV can be configured through the IDSE...

Page 7: ...n with current shunt Thermal design 1 GS66508B has a thermal pad at the bottom side for heat dissipation The heat is transferred to the bottom side of PCB using thermal vias and copper plane 2 A heatsink 35x35mm size can be attached to the bottom side of board for optimum cooling Thermal Interface Material TIM is needed to provide electrical insulation and conformance to the PCB surface The daught...

Page 8: ... daughter board with heatsink attached CAUTION There is no on board over temperature protection Device temperature must be closely monitored during the test Never operate the board with device temperature exceeding TJ_MAX 150 C Using GS EVB HB 66508B RN with universal mother board GS665MB EVB Figure 10 650V universal mother board GS665MB EVB 12V INPUT 5V Power Supply CIN VSW PWM control dead time ...

Page 9: ...can be powered by 9 12V on J1 On board voltage regulator creates to 5V for daughter board and control logic circuits J3 is used for external 12VDC fan PWM control circuit Figure 11 PWM control input and dead time circuit Figure 12 On board dead time generatrion circuit The top and bottom switches PWM inputs can be individually controlled by two jumpers J4 and J6 Users can choose between a pair of ...

Page 10: ...t points Test points are designed in groups pairs to facilitate probing Test points Name Description TP1 TP2 5V 0V 5V bias power TP7 TP8 PWMIN 0V PWM input signal from J7 TP4 TP3 TP13 PWMH PWML 0V High low side gate signals to daughter board TP9 TP10 VDC VDC DC bus voltage TP11 TP12 VOUT VDC Output voltage TP6 TP5 VSW VDC Switching node output voltage for HV oscilloscope probe Power connections CO...

Page 11: ... starts to ramp up until t1 The period of first pulse Ton1 defines the switching current ISW VDS TON1 L 3 t1 t2 is the free wheeling period when the inductor current IL forces Q1 to conduct in reverse 4 t1 turn off and t2 turn on are of interest for this test as they are the hard switching trasients for the half bridge circuit when Q2 is under high switching stress 5 The second pulse t2 t3 is kept...

Page 12: ... COUT RLoad This is standard half bridge configuration that can be used in following circuits Synchronous Buck DC DC Single phase half bridge inverter ZVS half bridge LLC Phase leg for full bridge DC DC or Phase leg for a 3 phase motor drive Jumper setting J4 Q1 INT J6 Q2 INT_INV Boost mode CON1 Q1 CON2 Q2 VDC CON4 CON3 LIN VDC CON7 CON6 VSW CON5 INPUT VIN When the output becomes the input and the...

Page 13: ...ion Board Kit Important Notice on page 26 Using GS EVB HB 66508B RN in system The daughter board allows users to easily evaluate the GaN performance in their own systems Refer to the footprint drawing of GS EVB HB 66508B RN as shown below Figure 14 Recommended footprint drawing of daughter board GS665XXX EVBDB 1 3 5 2 4 6 7 8 9 1 All units are in mm 2 Pin 1 6 Dia 1mm 3 Pin 7 9 1 91mm 75mil mountin...

Page 14: ...ughter board 3 Set up the mother board a Connect 12VDC bias supply to J1 b Connect PWM input gate signal 0 5V to J7 If it is generated from a signal generator ensure the output mode is high Z mode c Set J4 to OFF position and J7 to INT d Set High voltage HV DC supply voltage to 0V and ensure the output is OFF Connect HV supply to CON2 and CON6 e Use HV probe between TP6 and TP5 for Vds measurement...

Page 15: ... HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 15 Please refer to the Evaluation Board Kit Important Notice on page 26 a After the test is complete slowly ramp down the HV supply voltage to 0V and turn off the output Then turn off the 12V bias supply and signal generator output Figure 15 Pulses test setup example 12VDC PWM in Vdc Vdc Inductor ...

Page 16: ...uctance After the drain current reaches the inductor current the Vds starts to fall The Vgs undershoot spike is caused by the miller feedback via Cgd under negative dv dt Due to the low gate charge and small RG OFF GaN E HEMT gate has limited control on the turn off dv dt Instead the Vds rise time is determined by how fast the turn off current charges switching node capacitance Coss The low Coss o...

Page 17: ...____________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 17 Please refer to the Evaluation Board Kit Important Notice on page 26 Synchronous Buck Test L 120uH VIN 400V VOUT 80V D 20 FSW 100 kHz POUT 300W Figure 17 Buck test waveform Pout 300W Vds_low side I_inductor PWM_low side V_out ...

Page 18: ..._________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 18 Please refer to the Evaluation Board Kit Important Notice on page 26 Appendix A GS EVB HB 66508B RN Circuit schematics ...

Page 19: ...__________________________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 19 Please refer to the Evaluation Board Kit Important Notice on page 26 Assembly Drawing ...

Page 20: ...__________________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 20 Please refer to the Evaluation Board Kit Important Notice on page 26 PCB layout Top Layer Mid Layer 1 ...

Page 21: ...______________________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 21 Please refer to the Evaluation Board Kit Important Notice on page 26 Mid Layer 2 Bottom Layer ...

Page 22: ..._________________________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 22 Please refer to the Evaluation Board Kit Important Notice on page 26 Bill of Materials ...

Page 23: ...00R R1206 U2A 74VHC132 3 1 2 14 7 0V R1 49R9 0V D2 PMEG2005EB SOD523 VDC TR2 2K C12 100pF 0V U2B 74VHC132 4 5 6 U2C 74VHC132 9 10 8 U2D 74VHC132 12 13 11 VDC CON5 1 CON7 1 TP3 TP4 TP1 TP2 TP7 5V TP8 0V 0V VAUX 12V IN EXTERNAL PWM INPUT TO DSP MCU CONTROL BOARD PWM INPUT SELECTION ON BOARD DEAD TIME GENERATION CIRCUIT USE TR1 AND TR2 TO ADJUST DEAD TIME POS 2 3 INTERNAL PWM SIGNAL VOUT C1 220uF 25V...

Page 24: ...___________________________________________________________________________________ GS EVB HB 66508B RN Rev 210118 2021 GaN Systems Inc www gansystems com 24 Please refer to the Evaluation Board Kit Important Notice on page 26 Assembly drawing Assembly Top Assembly Bottom ...

Page 25: ... 2POS R A 5 08MM CON TERM BLK 2POS RA TE CONNECTIVITY 796638 2 11 1 J1 PLUG TERM BLOCK BLUG 2POS 5 08MM TE CONNECTIVITY 796634 2 12 1 J2 CONN RCPT 6POS 100 DBL STR PCB CON RCPT 2X3 BOT HARWIN M20 7850342 MOUNT FROM BOTTOM SIDE 13 1 J3 CON 2POS CONNECTOR FOR 12V FAN DO NOT INSTALL 14 2 J4 J6 CONN HEADER 8POS DUAL VERT PCB CON JMP 4POS HARWIN M20 9980445 15 1 J5 CONN 8 POS DUAL ROW 2 54MM CON HDR 4X...

Page 26: ... returned within 30 days from the date of delivery for a full refund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECI...

Page 27: ...designed authorized or warranted for use in lifesaving life sustaining military aircraft or space applications nor in products or systems where failure or malfunction may result in personal injury death or property or environmental damage The information given in this document shall not in any eventbe regarded as a guarantee of performance GaN Systems hereby disclaims any or allwarranties and liab...

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