The Isolated Half-Bridge: An IGBT Gate Driver Module with Current Sense, NCD57085DR2G
The Isolated Half-Bridge with Current Sense is a compact power electronics module designed to drive two IGBTs in a half-bridge configuration. Each gate driver channel uses an NCD57085DR2G single-channel gate driver IC from onsemi, paired with an R12P21509D isolated DC-DC converter module that generates the +15 V / –9 V bias required for proper IGBT operation.
A shunt resistor in the IGBT emitter path provides current sensing for overload detection and current monitoring. Power LEDs on each channel indicate the presence of the gate driver supply voltage. Figure 1 shows the fully assembled module.
High-current screw terminals accommodate the load connection and DC bus input. A seven-pin header connector provides access to the high-side and low-side PWM inputs, fault output, and gate driver power. The PCB supports TO-247 package IGBTs, allowing users to select devices appropriate to their application.
Specs and Features
- Supply: 12–20 VDC
- DC-DC Converter (R12P21509D) Output: +15 V / –9 V
- Gate Driver (NCD57085DR2G) Peak Output Current: +7 A / –7 A
- IGBT (AFGHL40T65RQDN): 40 A, 650 V
- Maximum Load Voltage: 500 V DC
- Current Sense Threshold: 250 mV (adjustable via shunt resistor value)
- Overcurrent fault output (active low; normally high)
- PCB Dimensions: 68.90 × 52.07 mm
- Mounting Holes: 4 × 4 mm
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The Isolated Half-Bridge with Current Sense is a compact power electronics module designed to drive two IGBTs in a half-bridge configuration. Each gate driver channel uses an NCD57085DR2G single-channel gate driver IC from onsemi, paired with an R12P21509D isolated DC-DC converter module that generates the +15 V / –9 V bias required for proper IGBT operation.
A shunt resistor in the IGBT emitter path provides current sensing for overload detection and current monitoring. Power LEDs on each channel indicate the presence of the gate driver supply voltage. Figure 1 shows the fully assembled module.
High-current screw terminals accommodate the load connection and DC bus input. A seven-pin header connector provides access to the high-side and low-side PWM inputs, fault output, and gate driver power. The PCB supports TO-247 package IGBTs, allowing users to select devices appropriate to their application.
Specs and Features
- Supply: 12–20 VDC
- DC-DC Converter (R12P21509D) Output: +15 V / –9 V
- Gate Driver (NCD57085DR2G) Peak Output Current: +7 A / –7 A
- IGBT (AFGHL40T65RQDN): 40 A, 650 V
- Maximum Load Voltage: 500 V DC
- Current Sense Threshold: 250 mV (adjustable via shunt resistor value)
- Overcurrent fault output (active low; normally high)
- PCB Dimensions: 68.90 × 52.07 mm
- Mounting Holes: 4 × 4 mm
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