Gate Driver Circuit: Low-Voltage Side - Broadcom ACPL-355JC Reference Manual

ACPL-355JC Reference Manual
Figure 11: ACPL-355JC Gate Driver Circuitry
With a maximum peak output current of 10A, the ACPL-355JC can drive most of the power IGBT/MOSFET switches directly
without an external push-pull stage. This driver contains an LED that is electrically isolated and optically coupled to an
integrated circuit on the gate driver high-voltage side with two power output stages and a CLAMP function for preventing the
parasitic turn-on due to the parasitic Miller current during turn-off transient. Other features encompass under-voltage lockout
(UVLO) and over-current (OC) protection as well as a soft shutdown during an OC fault.
Table 10 provides the recommended gate turn-on/turn-off resistor values for the WAB300M12BM3 and FF6MR12KM1
MOSFET modules.
Table 10: Recommended Values for Gate Turn-On/Turn-Off Resistors
Device
WAB300M12BM3
FF6MR12KM1

3.2.1 Gate Driver Circuit: Low-Voltage Side

Figure 12 shows the low-voltage side of the gate drive circuitry, which contains the power supply for ACPL-355JC, the LED
anode and cathode, and safety reporting signals (FAULT and UVLO).
The resistor responsible for the LED forward current setting is split in two, and those resistors are placed on anode pins 6
and 7 and cathode pin 8 to balance the common mode impedances at the LED's anode and cathode. This helps to equalize
the common mode voltage change. Resistor values are selected because it was recommended in the device data sheet.
Broadcom
R
g_on
2.95Ω (2x parallel 5.9Ω)
4.03Ω (2x parallel 8.06Ω)
62-mm SiC Module EB1200M62-355JC Evaluation Board
R
g_off
2.95Ω (2x parallel 5.9Ω)
4.03Ω (2x parallel 8.06Ω)
ACPL-355JC-62mmSiC-RM100
18