UCC28220_07 Datasheet, PDF (1/30 Pages) Texas Instruments – INTERLEAVED DUAL PWM CONTROLLER WITH PROGRAMMABLE MAX DUTY CYCLE

UCC28220, UCC28221
SLUS544C − SEPTEMBER 2003 − REVISED OCTOBER 2007
INTERLEAVED DUAL PWM CONTROLLER
WITH PROGRAMMABLE MAX DUTY CYCLE
FEATURES
D 2-MHz High Frequency Oscillator with 1-MHz
Operation Per Channel
D Matched Internal Slope Compensation
Circuits
D Programmable Maximum Duty Cycle Clamp
60% to 90% Per Channel
D Peak Current Mode Control with
Cycle-by-Cycle Current Limit
D Current Sense Discharge Transistor for
Improved Noise Immunity
D Accurate Line Under and Over-Voltage Sense
with Programmable Hysteresis
D Opto-Coupler Interface
D 110-V Internal Start-Up JFET (UCC28221)
D Operates from 12-V Supply (UCC28220)
D Programmable Soft-Start
TYPICAL APPLICATION
VIN
(+48V)
UCC28221
1 LINEOV VIN 16
APPLICATIONS
D High Output Current (50-A to 100-A)
Converters
D Maximum Power Density Designs
D High Efficiency 48-V Input with Low Output
Ripple Converters
D 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.
CS1
Bias
2 LINE LINEUV 15
HYS
3 VDD
REF 14
4 CS1 OUT1 13
1/2 UCC27324
VOUT
5 SLOPE OUT2 12
CS2
6 CS2
GND 11
7 SS
CHG 10
8 CTRL DISCHG 9
1/2 UCC27324
REF
E/A
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.
Copyright  2004, Texas Instruments Incorporated
www.ti.com
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