Self-oscillating Half-bridge Driver
Features
● Floating channel designed for bootstrap operation to +600V
● Noise immunity of transient voltage
● Under-voltage lockout
● Programmable oscillator frequency
● Matched propagation delay for both channels
● Ultra low startup current of 75uA
● Shutdown function turns off both channels
● Low side output in phase with RT
Description
GR8853A is a high voltage, high speed, self-oscillating power MOSFET and IGBT driver with both high and low side referenced output channels. Proprietary HVIC and latch immune CMOS technologies enable ruggedized monolithic construction. The front end features a programmable oscillator which is similar to the 555 timer. The output drivers feature a high pulse current buffer stage and an internal dead time designed for minimum driver cross-conduction. Propagation delays for the two channels are matched to simplify use in 50% duty cycle applications. The floating channel can be used to drive an N-MOSFET or IGBT in the high side configuration that operates off a high voltage rail up to 600 volts.
Applications
● HID lamp ballast
● PDP sustain driver
● Motor driver
● SMPS
Typical Application Circuit
Package
