UCC28220 Datasheet

IC型号：
UCC28220
PDF描述：
具有可编程最大占空比的双路交错 PWM 控制器
文件大小：
596.85KB
PDF页数：
28页
芯片厂家：
TI

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UCC28220, UCC28221

SLUS544A 鈭?SEPTEMBER 2003 鈭?REVISED AUGUST 2004

INTERLEAVED DUAL PWM CONTROLLER

WITH PROGRAMMABLE MAX DUTY CYCLE

FEATURES

2-MHz High Frequency Oscillator with 1-MHz

Operation Per Channel

Matched Internal Slope Compensation

Circuits

Programmable Maximum Duty Cycle Clamp

60% to 90% Per Channel

Peak Current Mode Control with

Cycle-by-Cycle Current Limit

Current Sense Discharge Transistor for

Improved Noise Immunity

Accurate Line Under and Over-Voltage Sense

with Programmable Hysteresis

Opto-Coupler Interface

110-V Internal Start-Up JFET (UCC28221)

Operates from 12-V Supply (UCC28220)

Programmable Soft-Start

APPLICATIONS

High Output Current (50-A to 100-A)

Converters

Maximum Power Density Designs

High Efficiency 48-V Input with Low Output

Ripple Converters

High Power Offline, Telecom and Datacom

Power Supplies

DESCRIPTION

The UCC28220 and UCC28221 are a family of BiCMOS

interleaved dual channel PWM controllers. Peak

current mode control is used to ensure current sharing

between the two channels. A precise maximum duty

cycle clamp can be set to any value between 60% and

90% duty cycle per channel.

UCC28220 has an UVLO turn-on threshold of 10 V for

use in 12-V supplies while UCC28221 has a turn-on

threshold of 13 V for systems needing wider UVLO

hysteresis. Both have 8-V turn-off thresholds.

TYPICAL APPLICATION

VIN

(+48V)

CS1

UCC28221

1 LINEOV

VIN 16

2 LINE

HYS

3 VDD

4 CS1

5 SLOPE

6 CS2

7 SS

LINEUV 15

REF 14

1/2 UCC27324

OUT1 13

OUT2 12

GND 11

CHG 10

REF

1/2 UCC27324

E/A

VOUT

Bias

CS2

8 CTRL DISCHG 9

NOTE: Pin 16 is a no connect (N/C) on UCC28220 which does not include the JFET option.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

铮?/div>

2004, Texas Instruments Incorporated

www.ti.com

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