USER GUIDE
UG499: Si828x-AW-GDB Gate Driver Boards
Skyworks Solutions, Inc. • Phone [949] 231-3000 • [email protected] • www.skyworksinc.com
206359B • Skyworks Proprietary Information • Products and Product Information are Subject to Change without Notice
5
November 10, 2022
•
PS-DISb:
The PS-DISb signal disables the output of the isolated DC/DC converters for the two channels. It is a single-
ended input that must be pulled low to turn off the power supplies. With the power supplies disabled the gate will be
held low with a 10 k
Ω
resistor. This signal can be used for startup sequencing.
•
PWM-EN:
This is a single-ended input that enables the PWM inputs for both channels. When this signal is pulled down
the differential receivers for both channels are disabled and the gates will both be pulled low through R_G-OFF. All pro-
tection circuitry and power supplies will continue to operate including FAULT and RTD outputs.
•
RESET:
This single-ended input clears a desaturation-induced fault state, allowing PWM inputs to function as soon as
RESET is released. When the signal is set high, FAULT will assume a high state if there are no UVLO conditions. The signal
should be returned to low in order to operate the device.
•
Over-Voltage and Reverse Polarity Protection:
Power input on pin 1 is protected against connecting a power source with
over-voltage or reverse polarity; there is a diode and a Zener diode across the power input, and a MOSFET in-line with
the power input.
3.2. Module Connectors (High-Voltage)
These connectors are located at the bottom of the Si828x-AW-GDB and provide direct connections to the Wolfspeed XM3 SiC
half-bridge modules. Table 2 provides a listing and locations of the signals on the module connectors.
•
HS-Gate:
The high-side gate pin is driven by the Si8281 Isolated Gate Driver IC and external BOM circuitry meant to
enhance the drive, soft shutdown, and Miller clamp functions for higher gate capacitance switch devices / arrays.
•
HS-Source:
The high-side source pin is connected to the VMID-H supply and the low-side DESAT detection circuit.
•
HS-Drain:
The high-side drain pin is connected to the high-side DESAT detection circuit.
•
LS-Gate:
The low-side gate pin is driven by the Si8285 Isolated Gate Driver IC and external BOM circuitry meant to
enhance the drive, soft shutdown, and Miller clamp functions for higher gate capacitance switch devices / arrays.
•
LS-Source:
The low-side source pin is connected to the VMID-L supply.
•
RTD-1 and RTD-2:
The RTD pins connect to a resistive temperature sensor in the switch device / module. The resistance
is sensed and converted to a frequency which is then sent across an isolation barrier to the digital transceiver and out
the I/O connector.
Table 2: Module Connectors (High Voltage)
Connector
Reference
Parallel
Connector Pins
Si828x-AW-GDB
Signal Name
Description
JT1
2, 4
HS-Gate
High-side gate lead of switch module
JT1
1, 3
HS-Source (LS-Drain) High-side source lead of switch module; primary output
JT2
1, 2, 3, 4
HS-Drain
High-side drain lead of switch module
JT6
2, 4
LS-Gate
Low-side gate lead of switch module
JT6
1, 3
LS-Source
Low-side source lead of switch module
JT5
1, 3
RTD-1
Lead 1 of switch module resistive temperature sensor
JT5
2, 4
RTD-2
Lead 2 of switch module resistive temperature sensor
