FEATURES

· Programmable Output Turn On Delay; Zero

Delay Available

· Compatible with Voltage Mode or Current

Mode Topologies

· Practical Operation at Switching Frequencies

to 300 kHz

· 10-MHz Error Amplifier

· Pin Programmable Undervoltage Lockout

· Low Startup Current – 150 mA

· Soft Start Control

· Outputs Active Low During UVLO

DESCRIPTION

The UC3879 controls a bridge power stage by phase

shifting the switching of one half-bridge with respect

to the other. This allows constant frequency pulse

width modulation in combination with resonant,

zero-voltage switching for high efficiency

performance. The UC3879 can be configured to

provide control in either voltage mode or current

mode operation, with overcurrent shutdown for fast

fault protection.

Independently programmable time delays provide

dead-time at the turn-on of each output stage,

allowing time for each resonant switching interval.