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UCC28220 Datasheet

  • UCC28220

  • 具有可編程最大占空比的雙路交錯 PWM 控制器

  • 596.85KB

  • 28頁

  • 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
D
2-MHz High Frequency Oscillator with 1-MHz
D
D
D
D
D
D
D
D
D
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
D
High Output Current (50-A to 100-A)
D
D
D
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.
Copyright
錚?/div>
2004, Texas Instruments Incorporated
www.ti.com
1

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