Datasheet > UCC3580Q-1

UCC3580Q-1

更新时间： 2024-11-28 23:39:03

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描述

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中文翻译

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数据手册

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UCC3580Q-1 数据手册

UCC1580-1,-2,-3,-4

UCC2580-1,-2,-3,-4

UCC3580-1,-2,-3,-4

Single Ended Active Clamp/Reset PWM

FEATURES

DESCRIPTION

• Provides Auxiliary Switch Activation

Complementary to Main Power

Switch Drive

The UCC3580 family of PWM controllers is designed to implement a variety

of active clamp/reset and synchronous rectifier switching converter topolo-

gies. While containing all the necessary functions for fixed frequency, high

performance pulse width modulation, the additional feature of this design is

the inclusion of an auxiliary switch driver which complements the main

power switch, and with a programmable deadtime or delay between each

transition. The active clamp/reset technique allows operation of single

ended converters beyond 50% duty cycle while reducing voltage stresses

on the switches, and allows a greater flux swing for the power transformer.

This approach also allows a reduction in switching losses by recovering en-

ergy stored in parasitic elements such as leakage inductance and switch

capacitance.

• Programmable deadtime (Turn-on

Delay) Between Activation of Each

Switch

• Voltage Mode Control with

Feedforward Operation

• Programmable Limits for Both

Transformer Volt- Second Product

and PWM Duty Cycle

The oscillator is programmed with two resistors and a capacitor to set

switching frequency and maximum duty cycle. A separate synchronized

ramp provides a voltage feedforward pulse width modulation and a pro-

grammed maximum volt-second limit. The generated clock from the oscilla-

tor contains both frequency and maximum duty cycle information.

• High Current Gate Driver for Both

Main and Auxiliary Outputs

• Multiple Protection Features with

Latched Shutdown and Soft Restart

• Low Supply Current (100µA Startup,

1.5mA Operation)

(continued)

BLOCK DIAGRAM

UDG-95069-2

Pin Numbers refer to DIL-16 and SOIC-16 packages

SLUS292A - FEBRUARY 1999 - REVISED JANUARY 2002

12 3 4 5 6 7...10

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