Gate Driver Circuit; Gate Driver Circuit: Low-Voltage Side - Broadcom ACPL-352J Reference Manual

ACPL-352J Reference Manual Infineon EconoPIM™ 3 IGBT Module EB1200-352J Evaluation Board
Figure 5: (a) 24V/5V Power Supply of the EB1200-352J Board, and (b) the Isolated 5V/5V Power Supply
a) b)
Figure 6: 24V/+15V/–15V Isolated Gate Driver High-Voltage Side Power Supply

4.2 Gate Driver Circuit

The used optocoupler-based IGBT gate drivers, ACPL-352J, feature fast signal propagation, desaturation detection, soft
shutdown protection, active clamping, and fault feedback. Figure 7 shows the both the low-voltage and high-voltage side
gate driver circuit.
Figure 7: Isolated Gate Drive Based on ACPL-352J

4.2.1 Gate Driver Circuit: Low-Voltage Side

Figure 8 shows the low-voltage (digital) side of the driver circuitry. The low-voltage side of the driver is supplied with +5V on
the VCC1 pin. The UVLO, FAULT, and GFAULT signals are pulled up to +5V with 10-kΩ resistors. These signals are normally
active high when no fault is present. Two 330-pF capacitors are added as a support for these signals according to the data
sheet. The two resistors 330Ω and 110Ω are connected to input LED's anode and cathode to help in equalizing the common
mode voltage changes at the anode and cathode and give high CMR performance. The input LED signal that is interfacing
with the controller is amplified with an IC buffer.
ATTENTION: Signals dedicated for high-side and low-side drivers, in one inverter leg, need to have proper dead time. The
board itself does not provide dead-time generation. The recommended minimal dead time is 5 µs.
Broadcom ACPL-352J-EB1200-RM100
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