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Application Note 4 of 23 V 1.1
2020-11-09
CoolGaN™ 600 V half-bridge evaluation platform featuring GaN
EiceDRIVER™
Functional description
2 Functional description
A typical block diagram is shown in Figure 2 for a double-pulse test application setup. A 5 V power supply
provides the circuit power, and a 0-400 V power supply provides the DC bus voltage. The input PWM signal is
provided by a lab pulse generator. A test inductor is then connected from the DC bus to the switch-node
output. An oscilloscope is used to measure the inductor current (with a current probe), switch-node voltage or
any other signal on the board. The available test points are described in
Table 2 .
+5V
Vsw
Isolated Gate
Driver Circuit
Isolated Gate
Driver Circuit
Deadtime
Circuit
Deadtime
Circuit
Isolated Gate
Drive Power
Vin+
Vo
Vin-
PWM
0V
Evaluation Board
0-400 V DC
Laboratory
Power Supply
Test
Inductor
+
-
5 V DC
Laboratory
Power Supply
50
Ω Pulse
Generator
Figure 2 Evaluation board typical application example (double-pulse test)
Note that the inductor can be connected to either the positive DC bus as shown in Figure 2 , or the negative bus
(V
in-
) for inverted double-pulse where the high-side is the active switch, and the low-side is the freewheeling
synchronous rectifier ( Figure 3 ).
The evaluation board can also be easily configured as a buck or boost topology. See section 4.2 for further
details.
+5V
Vsw
Isolated Gate
Driver Circuit
Isolated Gate
Driver Circuit
Deadtime
Circuit
Deadtime
Circuit
Isolated Gate
Drive Power
Vin+
Vo
Vin-
PWM
0V
Evaluation Board
0-400 V DC
Laboratory
Power Supply
Test
Inductor
+
-
5 V DC
Laboratory
Power Supply
50
Ω Pulse
Generator
Figure 3 Evaluation board connected for inverted double-pulse test