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UCC28221PW
Dual Interleaved PWM Controller with Programmable Max Duty Cycle
VDD
CS1
SLOPE
LINEOV
LINEUV
OUT1
OUT2
CHG
DISCHG
Bias
LINE
VIN
VIN
(+48V)
REF
GND
CS1
VOUT
1/2UCC27324
1/2UCC27324
HYS
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UCC28220, UCC28221SLUS544G–SEPTEMBER 2003–REVISED APRIL 2017
UCC2822x 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% 90% Per Channel Peak Current Mode Control With Cycle-by-Cycle
Current Limit Current Sense Discharge Transistorfor Improved
Noise Immunity Accurate Line Undervoltage and Overvoltage
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-Ato 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
DescriptionThe UCC28220 and UCC28221 area family of
BiCMOS interleaved dual channel PWM controllers.
Peak current mode controlis usedto ensure current
sharing between the two channels. A precise
maximum duty cycle clamp can be setto any
between 60% and 90% duty cycle per channel.
The UCC28220 has an UVLO turnon thresholdV for usein 12-V supplies while UCC28221
turnon thresholdof 13V for systems needing
UVLO hysteresis. Both have 8-V turnoff thresholds.
Additional features includea programmable
slope compensation witha special circuit which
usedto ensure exactly the same slopeis added
each channel anda high-voltage 110-V internal
for easier start-up for the wider hysteresis UCC28221
version.
The UCC28220is availablein both 16-pin SOIC
low-profile TSSOP packages. The UCC28221 also
comesin 16-pin SOIC package anda slightly larger
20-pin TSSOP packageto allow for high-voltage pin
spacingto meet UL1950 creepage clearance safety
requirements.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
