UCC28220-Q1_15 Datasheet, PDF (1/27 Pages) Texas Instruments – INTERLEAVED DUAL PWM CONTROLLER WITH PROGRAMMABLE MAXIMUM DUTY CYCLE

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INTERLEAVED DUAL PWM CONTROLLER
WITH PROGRAMMABLE MAXIMUM DUTY CYCLE
UCC28220-Q1
SLUS789 – MARCH 2008
FEATURES
1
•2 Qualified for Automotive Applications
• 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 Undervoltage and Overvoltage
Sense With Programmable Hysteresis
• Opto-Coupler Interface
• Operates From 12-V Supply
• 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 is a BiCMOS interleaved
dual-channel PWM controller. 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. It has 8-V
turn-off threshold.
Additional features include a programmable internal
slope compensation with a special circuit that ensures
exactly the same slope is added to each channel.
The UCC28220 is available in a 16-pin low-profile
TSSOP package.
TYPICAL APPLICATION
VIN
(48 V)
UCC28220
1 LINEOV N/C 16
Bias
2 LINE LINEUV 15
HYS
3 VDD
REF 14
4 CS1 OUT1 13
5 SLOPE OUT2 12
6 CS2
7 SS
GND 11
CHG 10
8 CTRL DISCHG 9
CS1
1/2 UCC27324
CS2
1/2 UCC27324
VOUT
REF
E/A
1
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.
PowerPAD is a trademark of Texas Instruments.
2
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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 © 2008, Texas Instruments Incorporated