GS-EVB-HB-66508B-RN Technical Manual
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GS-EVB-HB-66508B-RN Rev. 210118 © 2021 GaN Systems Inc.
www.gansystems.com 10
Please refer to the Evaluation Board/Kit Important Notice on page 26
controlled by J7 input) with dead time or external high/low side drive signals from J5 (users’ own control
board).
An on-board dead time generation circuit is included on the mother board. 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 fine adjustment of the dead time
if needed.
WARNING!
ALWAYS double check the jumper setting and PWM gate drive signals
before applying power. Incorrect PWM inputs or jumper settings may cause
device failures
Test 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:
CON1-CON7 mounting pads are designed to be compatible 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
)
Output passives (L and C14)
An external power inductor (not included) can be connected between VSW (CON1) and VOUT (CON4/5)
or VDC+ (CON2/3) for double pulse test. Users can choose their inductor size to meet the test
requirement. Generally it is recommended to use power inductor with low inter-winding capacitance to
obtain best switching performance. For the double pulse testing we use 2x 60uH/40Amp inductor (CWS,
P/N: HF467-600M-40AV) in series. C14 is designed to accommodate a film capacitor as output filter.
