Renesas Electronics announced the availability of an IGBT drive optocoupler product featuring an integrated insulated gate bipolar transistor (IGBT) protection function.
The PS9402 comprises a gallium-aluminium-arsenide (GaAlAs) LED as the light emitting element, a photodetector IC and an IGBT protection circuit. It is designed to drive IGBTs used in inverter devices for purposes such as motor control. The use of the new optocoupler facilitates the design of IGBT peripheral circuits and enables IGBT direct drive up to the 1200 V and 100 A class. The compact 16-pin SOP (small outline package) contributes to system compactness.
When a fault (short circuit) occurs in the IGBT connected to the optocoupler, the collector-emitter voltage of the IGBT rises and may damage the device. The PS9402 detects a rise in collector-emitter voltage and turns off the IGBT. It also incorporates a soft turn-off function that suppresses the generation of noise when the IGBT is turned off. A fault signal is output to indicate that an abnormal shut-off has occurred, and an auto-reset function performs recovery automatically once a specified time (minimum 5 microseconds) has elapsed after the fault was detected.
When the IGBT connected to the optocoupler turns off, current flow to the collector-gate capacitance (Miller current) can generate a gate voltage that causes a malfunction. The active Miller clamp circuit built into the PS9402 absorbs the Miller current, averting malfunctions by preventing the gate voltage from rising.
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