Gan Systems GS66502B-EVBDB User Manual Download Page 20 | Manualshive

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The switching energy can be calculated from the measured switching waveform Psw = Vds*Id. The
integral of the Psw during switching period is the measured switching loss. The channel deskewing is
critical for measurement accurary. It is recommended to manually deskew Id against Vds as shown in
Figure 21. The drain current spike is caused by charging the high side switch Coss (Qoss loss).

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Summary of Contents for GS66502B-EVBDB

Page 1: ...e 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 w...

Page 2: ...2B GaN E HEMT 650V 7 5A 200m GS66504B EVBDB GS66504B GaN E HEMT 650V 15A 100m GS66508B EVBDB GS66508B GaN E HEMT 650V 30A 50m GS66508T EVBDB GS66508T GaN E HEMT top side cooled 650V 30A 50m GS66516T E...

Page 3: ...e VSW Switching node output VDC Input DC bus voltage ground return Note that control ground 0V is isolated from VDC Si8271 Iso Gate Driver Q1 Q2 Si8271 Iso Gate Driver Iso DC DC or Bootstrap Iso DC DC...

Page 4: ...GS G Recommended probing positions for Q2 VDS H Holes for temperature monitoring of Q1 Q2 I M3 mounting screw for heatsink J Optional RC snubber circuit This daughter board includes two GaN Systems E...

Page 5: ...s of gate resistors to fine tune the turn on and off speed FB1 FB2 are footprints for optional ferrite bead By default they are populated with 0 jumpers If gate oscillation is observed it is recommend...

Page 6: ...affects the power loop inductance and its inductance should be kept as low as possible Use a copper foil or jumper with low inductance 1 When measuring VSW with current shunt ensure all channel probe...

Page 7: ...valuation kit supplies with a 35x35mm heatsink with M3 tapped hole and other heatsinks can also be used to fit users system design 3 Care should be taken during the assembly of heatsink to avoid PCB b...

Page 8: ...ared to bottom cooled design T package eliminates the PCB thermal resistance and significantly improve the thermal performance Theraml grease is typically not needed on the assembly If thermal grease...

Page 9: ...GaNPX T GaNPX T FR4 PCB Heatsink M3 Screw Lock Washter Insulated bushing TIM...

Page 10: ...evaluation kit includes following items 1 Mother board GS665MB EVB 2 12VDC Fan The board can be powered by 9 12V on J1 On board voltage regulator creates to 5V for daughter board and control logic ci...

Page 11: ...rd Dead time is controlled by two RC delay circuits R6 C12 and R5 C11 The default dead time is set to about 100ns Additionally two potentiometers locations are provided TR1 TR2 not included to allow f...

Page 12: ...patible with following mounting terminals 10 32 Screw mount Banana Jack PCB mount Keystone P N 575 4 or PC Mount Screw Terminal Keystone P N 8191 An external power inductor not included can be connect...

Page 13: ...rrent 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 sw...

Page 14: ...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 CON1 Q1 CON2 Q2 VDC CON4 CON3 LIN VDC CON7 CON6 VSW CON5 INPUT VIN When the out...

Page 15: ...the GaN performance in their own systems Refer to the footprint drawing of GS665XXX EVBDB as shown below 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 mounting hole...

Page 16: ...C 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 f Connect external inductor between CON1 and CON3 Use curr...

Page 17: ......

Page 18: ...ack 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...

Page 19: ...A T M search coaxial current shunt SDN 414 10 0 1 is installed for switching loss measurement as shown below...

Page 20: ...integral of the Psw during switching period is the measured switching loss The channel deskewing is critical for measurement accurary It is recommended to manually deskew Id against Vds as shown in F...

Page 21: ...nts with drain current from 0 to 30A for GS66508T or up to 60A for GS66516T can be found in Figure 23 The turn on loss dominates the overall hard switching loss Eon at 0A is the Qoss loss caused by th...

Page 22: ...to a synchronous buck DC DC converter and demonstrates efficiency close to 99 at 2kW With forced air cooling the board is tested up to 2kW for GS66508T with device temperature Tjmax 75 C and 2 4kW for...

Page 23: ......

Page 24: ...L VCC_ 5V VDRV C21 4 7uF C0805 0V C4 C5 GNDH C6 C7 VIN ENABLE PWMH_IN GNDL PGND PWML_IN C22 1uF GNDL VEEL JP1 CON JMP CSHUNT PH R8 3 3K Q1G ENABLE CON1 CON EDGE MNT 3260 CON2 CON EDGE MNT 3260 CON3 CO...

Page 25: ......

Page 26: ...Top Layer Mid Layer 1 Mid Layer 2 Bottom Layer...

Page 27: ...il to short the connection if not used DO NOT INSTALL 1 J1 CONN 3PIN DUAL ROW 0 1 PITCH R A CON HDR 2X3 SAMTEC TSW 103 08 G D RA 1 J2 CON 6POS FOR FCT TEST POINTS DO NOT INSTALL 2 LED1 LED2 LED GREEN...

Page 28: ...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...

Page 29: ...Assembly Top Assembly Bottom...

Page 30: ...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...

Page 31: ...THER 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 T...

Page 32: ......

Page 33: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information GaN Systems GS66516T EVBDB...

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