Datasheet Texas Instruments UCC28231PWR — 数据表

UCC28230
UCC28231
www.ti.com . SLUS814A – FEBRUARY 2008 – REVISED JUNE 2008 Advanced PWM Controller for Bus Converters
FEATURES 1 Programmable, Load Depended Off Time
Control
Frequency Controlled Start Up Allows Small
Output Inductor, Low Ripple and Constant
Current Start with Large Output Capacitor
Two 0.2-A Push-Pull Outputs Provide Matched
Control Signals D to External Drivers
Two Additional 1-D Outputs for Optimal Use
of Self-Driven or Control Driven Synchronous
Rectifiers
Unregulated, Fixed Volt-Second or Fixed
Frequency Modes set by User
Two, 1.5% Overall Accuracy Reference Voltage
Options: 5-V for UCC28230 and 3.3-V for
UCC28231
Resistor Programmable Switching Frequency
up to 1 MHz
Cycle-by-Cycle Current Limit Allows Parallel
Operation with Droop Based Current Sharing
Single External Capacitor sets Soft-Start and …