UCC38083PWR

8Pin CURRENT MODE PUSH-PULL PWM CONTROLLERS WITH PROGRAMMABLE SLOPE COMPENSATION

DESCRIPON

The UCC38083/4/5/6 is a family of BiCMOS pulse width modulation PWM controllers for dc-to-dc or off-line fixed-frequency current-mode switching power supplies. The dual output stages are configured for the push-pull topology. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 110 ns, limiting each output’s duty cycle to less than 50%.

FEATURES

Programmable Slope Compensation

Internal Soft-Start on the UCC38083/4

Cycle-by-Cycle Current Limiting

Low Start-Up Current of 120 µA and 1.5 mA Typical Run Current

Single External Component Oscillator Programmable from 50 kHz to 1 MHz

High-Current Totem-Pole Dual Output Stage Drives Push-Pull Configuration with 1-A Sink and 0.5-A Source Capability

Current Sense Discharge Transistor to Improve Dynamic Response

Internally Trimmed Bandgap Reference

Undervoltage Lockout with Hysteresis