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GS66508T-EVBHB 650V

GaN E-HEMT Half Bridge Evaluation Board

User’s Guide

_____________________________________________________________________________________________________________________

GS66508T-EVBHB UG rev. 150917

© 2015 GaN Systems Inc.

www.gansystems.com 18

Please refer to the Evaluation Board/Kit Important Notice on page 21

Bottom Layer

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Содержание GS66508T-EVBHB

Страница 1: ...version of this user s guide DANGER Electrical Shock Hazard Hazardous high voltage may be present on the board during the test and even brief contact during operation may result in severe injury or death Follow all locally approved safety procedures when working around high voltage Never leave the board operating unattended After it is de energized always wait until all capacitors are discharged b...

Страница 2: ...nce design for the gate driver circuit half bridge PCB layout and thermal management Functional Overview Please refer to the circuit schematic in appendix for all signal names circuit nodes and test points The block diagram of the GS66508T EVBHB can be seen in Figure 1 All components are mounted on the top side except for E HEMTs Q1 and Q2 which are mounted on the bottom side of the EVB A heatsink...

Страница 3: ..._____________________________________________________________________________ GS66508T EVBHB UG rev 150917 2015 GaN Systems Inc www gansystems com 3 Please refer to the Evaluation Board Kit Important Notice on page 21 Figure 2 Board overhead view Figure 3 Board bottom view showing 2x GS66508T with heatsink removed ...

Страница 4: ...the logic circuit and 6 5V for the gate driver Gate input J2 J5 Figure 5 Gate signal input J2 J5 Set signal generator output level to 5V with 50Ω impedance for the gate PWM signal input on connector J5 The high side gate drive signal can be configured by jumper J3 By default J3 is set to the INT position internal created by an on board circuit The on board logic circuit inverts the PWM input on J5...

Страница 5: ...G rev 150917 2015 GaN Systems Inc www gansystems com 5 Please refer to the Evaluation Board Kit Important Notice on page 21 Dead time control Figure 6 Dead time control circuit Dead time is controlled by two RC delay circuits R16 C15 and R22 C19 By default 100ns dead time is used Additionally two potentiometers locations are provided TR1 TR2 not included to allow fine adjustment of the dead time i...

Страница 6: ...ded to select turn on gate resistance between 15 25Ω for optimal performance Smaller turn on gate resistor values may create fast switching speeds causing unnecessary Miller turn on and oscillation For turn off it is recommended to use a small value of less than 2Ω for the turn off gate resistors R10 R21 This will provide a strong pull down during turn off and reduce the Miller voltage effects 6 5...

Страница 7: ...n between clamping diode and the gate if to suppress any unwanted gate oscillation is observed Ferrite bead Ferrite bead on the gate helps to damp the gate ringing and reduce the risk of gate oscillation On the other hand adding ferrite bead increases the gate inductance and risk of miller turn on A small surface mount device SMD EMI suppression ferrite bead with impedance of 10 20Ω 100MHz is suff...

Страница 8: ... J4 high side VGH and J7 low side VGL for gate drive signal measurements WARNING ALWAYS use high voltage differential or isolated probes for measuring high side floating signals Attaching probe to high side gate signal may affect the switching behaviors due to the added parasitic and coupling capacitance introduced by the probe To obtain best switching performance it is recommended to only measure...

Страница 9: ...y electrically connected to the Source of the device Forced air cooling is recommended for power testing The airflow direction should be controlled from the left side as shown in Figure 9 for best cooling performance CAUTION Device temperature must be closely monitored during the test Never operate the board with device temperature exceeding TJ_MAX 150 C Power Stage Setup Power connections CON1 6 ...

Страница 10: ...as free wheeling device sync which is driven synchronously Figure 10 shows an example of the PWM input signal and pulse test switching waveforms for the pulse test mode Since a bootstrap circuit is used to create the high side gate voltage the low side device Q2 must be turned on first before the first testing pulse to ensure that the high side gate driver is powered up This can be implemented by ...

Страница 11: ...s attached between VBUS and VBUS the board is converted into a boost mode circuit and can be used for Synchronous Boost DC DC Totem pole bridgeless PFC Quick start procedure pulse test mode 1 Equipment and components you will need to get started Four channel oscilloscope with 500MHz bandwidth or higher high bandwidth 500MHz or higher passive probe high bandwidth 500MHz high voltage probe 600V AC D...

Страница 12: ...nfirm that gate drive signals VGL and VGH are present and the gate voltage levels are correct 5 Connect the probes as shown in Figure 11 for the following measurements a VGL J7 low side gate signal passive probe b VDS J6 low side drain voltage HV probe c VGH J4 high side gate signal HV differential probe optional d IL current probe for inductor current 6 Set the High Voltage HV DC supply voltage l...

Страница 13: ...test VDS 400V IMAX 30A TON 2us N 5 L 120uH Pulse test results show that the gate driver is stable for the entire operating range from 0 30A with no oscillation and minimum drain voltage overshoot Figure 12 Pulse Test waveforms 400V 30A The measured rise time for turn on is 10ns and the fall time at 30A turn off is 6ns The miller voltage is under good control with a peak value of 0 8V which is lowe...

Страница 14: ... Important Notice on page 21 a Turn on waveforms 400V 22A b Turn off waveforms 400V 30A Figure 13 Pulse test switching waveforms turn on and turn off Synchronous Buck Test L 120uH VIN 400V VOUT 200V D 50 FSW 100 kHz POUT 0 2kW The board is converted to a synchronous buck DC DC converter and demonstrates efficiency 98 5 from 1kW to 2kW With forced air cooling the peak device temperature TJ_MAX was ...

Страница 15: ...___________________________________________________ GS66508T EVBHB UG rev 150917 2015 GaN Systems Inc www gansystems com 15 Please refer to the Evaluation Board Kit Important Notice on page 21 Figure 15 Synchronous Buck switching waveforms CCM POUT 1500W Figure 16 Thermal image showing Q1 and Q2 temperature POUT 1500W TJMAX 80 C TAMB 25 C ...

Страница 16: ...V MKP1848 0V D G S GS66508T Q2 GANPX T G CON1 CON3 VSW VIN 0V C14 1uF IN GND OUT MIC5225YM5 VDRVL 0V ADJ EN R15 42K2 R17 10K 24R9 VDD ANODE VO1 VO2 GND R18 0R R21 SI8261BAC 0V C16 2 2uF CATH N C2 332R N C1 D3 0V FB2 15R 100MHz DZ4 C18 0V PMEG2010 0V U5 R19 SOD323 TP18 GOL R23 10K TP17 VDDL TP16 INL TP21 TP20 0VL TP22 0VGDH J4 0V J7 VOUT VGH WARNING USE HV DIFFERENTIAL PROBES ON HIGH SIDE SIGNALS V...

Страница 17: ...___________________________________________________________________________________________________________________ GS66508T EVBHB UG rev 150917 2015 GaN Systems Inc www gansystems com 17 Please refer to the Evaluation Board Kit Important Notice on page 21 PCB Layout Top layer ...

Страница 18: ...e _____________________________________________________________________________________________________________________ GS66508T EVBHB UG rev 150917 2015 GaN Systems Inc www gansystems com 18 Please refer to the Evaluation Board Kit Important Notice on page 21 Bottom Layer ...

Страница 19: ...___________________________________________________________________________________________________________________ GS66508T EVBHB UG rev 150917 2015 GaN Systems Inc www gansystems com 19 Please refer to the Evaluation Board Kit Important Notice on page 21 Assembly Drawing Top ...

Страница 20: ... ELECTRONICS 74279268 FB2 R10 R21 32 RES SMD 0 0 OHM JUMPER 1 10W VISHAY DALE CRCW06030000Z0EA J1 1 TERM BLOCK HDR 2POS R A 5 08MM TE CONNECTIVITY 796638 2 J2 J5 J6 3 CONN BNC JAC STR 50 OHM AMPHENOL 112538 DNP J2 J3 1 CONN HEADER 3POS 2 54MM WURTH ELECTRONICS 61300311121 J4 J7 2 CONN SMA JACK SMD VERT 50OHM LINX CONSMA001 SMD G Q1 Q2 2 TRANS GAN E HEMT 650V 30A GAN SYSTEMS INC GS66508T E01 R1 1 R...

Страница 21: ... board kit may be 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 A...

Страница 22: ...nents are not 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 event be regarded as a guarantee of performance GaN Systems hereby disclaims any or all war...

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