Description

This reference design is a 4.2-W: single-channel: automotive 12-V battery input flyback bias supply for IGBT/SiC isolated gate drivers. The supply accepts a wide input range of 4.5-V to 65-V DC. The output is configurable as +15 V:–8 V or +20 V: –4 V at loads up to 180 mA for driving the IGBT/SiC MOSFET power modules. The system consists of reverse polarity protection: electric transients clamping: and overvoltage and undervoltage protection circuits. The flyback controller implements primary-side regulation with better than ±1% load and line regulation performance. The power stage design includes the dual-channel isolated gate drivers with 5.7-kVRMS reinforced isolation and designed in compact form factor of 100 mm × 62 mm. It includes isolated DC bus sensing: isolated temp sensing: logic shoot-through protection and diagnostic features.