我还特意去网上看了下这个数据手册 对VCC这样描述Internal 5V LDO output. The driver and control circuits are powered from this
voltage. Decouple with a minimum 1μF ceramic capacitor as close to the pin as
possible. X7R or X5R grade dielectric ceramic capacitors are recommended for their
stable temperature characteristics.
是5V线性输出,我猜想是不是作为上下管的基电压。