GS-EVB-HB-0650603B-HD
Half Bridge Bipolar Drive Switch Board
Technical Manual
_____________________________________________________________________________________________________________________
GS-EVB-HB-0650603B-HD TM Rev. 210712 © 2021 GaN Systems Inc
10
Please refer to the Evaluation Board/Kit Important Notice on page # 16
Figure 8: Double Pulse Test Waveforms
An inductor is placed in parallel with the high side switch. The goal of this inductor is to establish the test
level current in the low side switch at the end of the first on pulse (1). The magnitude of the test level
current at the end of period 1 is given by:
𝐼
𝐿
=
𝑉
𝐵𝑈𝑆
𝑇
𝑂𝑁_1
𝐿
During period 2, the inductor current will naturally decay. The duration of period 2 should not be too long
that inductor current deviates significantly from the desired test level.
During period 3, the inductor current will again rise. Period 3 should not be so long that the inductor
current rises to an excessive level.
The falling edge of pulse 1 is used to examine the hard turn off characteristics of the switch. The rising
edge of pulse 3 is used to examine the hard turn on characteristics of the switch. By only applying these
two pulses, the switches are only on for a very short time and should not overheat.
3.2
Components Specification
COMPONENTS
Drivers:
Heyday HEY1011-L12C
Inductor:
49uH 360m
Ω
Air Core
R
PU
:
10
R
PD
:
1
V
DS
I
L
V
GS_L
1
2
3
Test level
current
Hard switching edges
I
DS
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