UCC3808ADTR-1集成电路（IC）的ACDC转换器离线开关规格书PDF中文资料

UCC3808ADTR-1属于集成电路（IC）的ACDC转换器离线开关。由德州仪器制造生产的UCC3808ADTR-1AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。

1 Features

1• Dual-Output Drive Stages in Push-Pull

Configuration

• Current-Sense Discharge Transistor to Improve

Dynamic Response

• 130-μA Typical Starting Current

• 1-mA Typical Run Current

• Operation to 1 MHz

• Internal Soft Start

• On-Chip Error Amplifier With 2-MHz Gain

Bandwidth Product

• On-Chip VDD Clamping

• Output Drive Stages Capable of 500-mA Peak-

Source Current, 1-A Peak-Sink Current

2 Applications

• High-Efficiency Switch-Mode Power Supplies

• Telecom DC-to-DC Converters

• Point-of-Load Power Modules

• Low-Cost Push-Pull and Half-Bridge Applications

3 Description

The UCCx808A devices are a family of BiCMOS

push-pull, high-speed, low-power, pulse-width

modulators. The UCCx808A contains all of the control

and drive circuitry required for off-line or DC-to-DC

fixed frequency current-mode switching power

supplies with minimal external parts count.

The UCCx808A dual-output drive stages are

arranged in a push-pull configuration. Both outputs

switch at half the oscillator frequency using a toggle

flip-flop. The dead time between the two outputs is

typically 60 ns to 200 ns depending on the values of

the timing capacitor and resistors, thus limiting each

output stage duty cycle to less than 50%.

The UCCx808A family offers a variety of package

options, temperature range options, and choice of

undervoltage lockout levels. The family has UVLO

thresholds and hysteresis options for off-line and

battery-powered systems.

The UCCx808A is an enhanced version of the

UCC3808 family. The significant difference is that the

A versions feature an internal discharge transistor

from the CS pin to ground, which is activated each

clock cycle during the oscillator dead time. The

feature discharges any filter capacitance on the CS

pin during each cycle and helps minimize filter

capacitor values and current sense delay.