Dual Interleaved PWM Controller with Programmable Max Duty Cycle - UCC28220


Dual Interleaved PWM Controller with Programmable Max Duty Cycle


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.

Additional features include a programmable internal slope compensation with a special circuit which is used to ensure exactly the same slope is added to each channel and a high voltage 110-V internal JFET for easier startup for the wider hysteresis UCC28221 version.

The UCC28220 is available in both 16-pin SOIC and low-profile TSSOP packages. The UCC28221 also comes in 16-pin SOIC package and a slightly larger 20-pin TSSOP package to allow for high voltage pin spacing to meet UL1950 creepage clearance safety requirements.


  • 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 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
    • 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

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Parametrics Compare all products in PWM and Resonant Controller

Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Regulated Outputs (#)
Special Features
Operating Temperature Range (C)
Approx. Price (US$)
UCC28220 LM5032 LM5034 UCC28221
Forward     Flyback
Current     Current     Current     Current    
90         90    
2000     1000     1000     2000    
10.0/8.0         13.0/8.0    
2         2    
HV Start-up
Input Line Monitor
Programmable Slope Compensation    
Synchronization Pin     Synchronization Pin     HV Start-up
Input Line Monitor
Programmable Slope Compensation
Soft Start    
Catalog     Catalog     Catalog     Catalog    
-40 to 105     -40 to 125     -40 to 125     -40 to 105    
16TSSOP     20TSSOP     16SOIC
1.90 | 1ku     1.40 | 1ku     1.45 | 1ku     2.40 | 1ku    

Other qualified versions of UCC28220

Version Part Number Definition
Automotive UCC28220-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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