UCC28220, UCC28221

SLUS544C − SEPTEMBER 2003 − REVISED OCTOBER 2007

INTERLEAVED DUAL PWM CONTROLLER

WITH PROGRAMMABLE MAX DUTY CYCLE

1

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FEATURES

Operation Per Channel

Circuits

60% to 90% Per Channel

Cycle-by-Cycle Current Limit

Improved Noise Immunity

with Programmable Hysteresis

APPLICATIONS

Converters

Ripple Converters

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

UCC28221

3

7

6

4

5

1

8

15

11

12

14

13

9

10

VDD

CS1

SLOPE

CS2

SS

CTRL

LINEOV

LINEUV

OUT1

OUT2

CHG

DISCHG

Bias

E/A

2

16

LINE

VIN

VIN

(+48V)

REF

GND

CS1

VOUT

REF

1/2 UCC27324

1/2 UCC27324

CS2

HYS

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

Copyright

 2004, Texas Instruments Incorporated

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.