UC3849N

Soft Switching PWM Controllers Sec Side Avg Current Mode

DESCRIPON

The UC3849 family of average current mode controllers accurately accomplishes secondary side average current mode control. The secondary side output voltage is regulated by sensing the output voltage and differentially sensing the AC switching current. The sensed output voltage drives a voltage error amplifier. The AC switching current, monitored by a current sense resistor, drives a high bandwidth, low offset current sense amplifier.

FEATURES

•Practical Secondary Side Control of Isolated Power Supplies

•1MHz Operation

•Differential AC Switching Current Sensing

•Accurate Programmable Maximum Duty Cycle

•Multiple Chips Can be Synchronized to Fastest Oscillator

•Wide Gain Bandwidth Product 70MHz, Acl>10 Current Error and Current Sense Amplifiers

•Up to Ten Devices Can Easily Share a Common Load