Description

The reference design is a compact size, dual-channel output isolated gate driver board design for IGBT in solar inverter, PCS, as well as UPS and motor driver applications. The isolated bias power is implemented with fly-buck topology using the TPS54308 synchronous buck converter. This converter provides primary-side regulation without the need of optocoupler feedback and offers good output voltage regulation with certain input voltage variation versus the open-loop control method. The design takes 12-V input voltage and generates a non-isolated 5-V rail for primary-side MCU and two isolated outputs with 1500-V function isolation. Each output channel was split to 15-V and –8-V rail and biases each UCC23513 isolated gate driver. The total maximum power for each channel is 2 W. The design is a single-layer PCB board for easy manufacturing.