UCC2891DR集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF中文资料

UCC2891DR属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由德州仪器制造生产的UCC2891DRDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。

FEATURES

Low Output Jitter

Soft−Stop Shutdown of MAIN and AUX

Ideal for Active Clamp/Reset Forward,

Flyback Converters

Provides Complementary Auxiliary Driver

with Programmable Deadtime (Turn-On

Delay) between AUX and MAIN Switches

Peak Current-Mode Control with

Cycle-by-Cycle Current Limiting

110-V Input Startup Regulator on UCC2891/3

TrueDrive 2-A Sink, 2-A Source Outputs

Accurate Line UV and Line OV Threshold

Programmable Slope Compensation

1.0-MHz Synchronizable Oscillator

Precise Programmable Maximum Duty Cycle

Programmable Soft Start

APPLICATIONS

150-W to 700-W SMPS

High-Efficiency, Low EMI/RFI Off-Line or

DC/DC Converters

Server, 48-V Telecom, Datacom

High Power Adapter, LCD-TV and PDP-TV

DESCRIPTION

The UCC2891/2/3/4 family of PWM controllers is

designed to simplify implementation of the various

active clamp/reset switching power topologies.

The UCC289x is a peak current-mode, fixedfrequency,

high-performance pulse width modulator.

It includes the logic and the drive capability for the

auxiliary switch with a simple method of

programming the critical delays for proper active

clamp operation.

The UCC2891/3 includes a 110-V start-up

regulator for initial start-up and to provide

keep-alive power during stand-by.

Additional features include an internal

programmable slope compensation circuit,

precise DMAX limit, and a single resistor

programmable synchronizable oscillator. An

accurate line monitoring function also programs

the converter’s ON and OFF transitions with

regard to the bulk input voltage. Along with the

UCC2897, this UCC289x family allows the power

supply designer to eliminate many of the external

components, reducing the size and complexity of

the design.