UCC28064A Natural Interleaving™ transition-mode PFC controller with high light-load efficiency | TI.com

UCC28064A (ACTIVE) Natural Interleaving™ transition-mode PFC controller with high light-load efficiency



The UCC28064A interleaved PFC controller has higher power ratings than previously possible. The device uses a Natural Interleaving™ technique. Both channels operate as masters (there is no slave channel) synchronized to the same frequency. This approach enables faster response time, excellent phase-to-phase on-time matching, and transition mode operation for each channel. The device has a burst mode function to get high light-load efficiency. Burst mode eliminates the need to turn off the PFC during light load operation to meet standby power targets. Burst mode eliminates the need for an auxiliary flyback converter when paired with UCC25630x LLC controller and the UCC24624 synchronous rectifier controller.

Expanded system level protections features include input brownout and dropout recovery, output over-voltage, open-loop, overload, soft-start, phase-fail detection, and thermal shutdown. The additional fail-safe over-voltage protection (OVP) feature protects against shorts to an intermediate voltage that, if undetected, could lead to catastrophic device failure. Advanced non-linear gain results in rapid, yet smooth response to line and load transient events. Special line-dropout handling avoids significant current disruption. Strong reduction of bias current when not switching during burst mode operation, improves stand-by performance.


  • Input Filter and Output Capacitor Ripple-Current Reduction
    • Reduced Current Ripple for Higher System Reliability and Smaller Bulk Capacitor
    • Reduced EMI Filter Size
  • High Light-Load Efficiency
    • User Adjustable Phase Management with Input Voltage Compensation
    • Burst Mode Operation with Adjustable Burst Threshold
    • Helps Enable Compliance to EUP Lot6 Tier II, CoC Tier II and DOE Level VI Standards
  • Sensorless Current-Shaping Simplifies Board Layout and Improves Efficiency
  • Input Line Feed-Forward for Fast Line Transient Response
  • Inrush-Safe Current Limiting:
    • Prevents MOSFET Conduction During Inrush
    • Eliminates CCM Operation and Reverse Recovery Events in Output Rectifier
  • Operating Temperature Range –40°C to +125°C in a 16-pin SOIC Package
  • Create a Custom Design Using the UCC28064A With the WEBENCH® Power Designer

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AC Frequency  60 Hz  50 Hz
  Min   Max Range
VinRMS -  V 85.0 to 265.0V
Vout  V 115 to 420V
Iout  A 0 to 7A
Ambient Temp °C -40 to 125°C


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Part number Order Device type Control method UVLO thresholds on/off (V) Operating supply (Max) (V) Operating supply current (mA) Operating temperature range (C) Rating Features Package Group Package size: mm2:W x L (PKG)
UCC28064A Order now Interleaved PFC     TM     10.35 / 9.6     21     5     -40 to 125     Catalog     < 150W Applications
> 750W Applications
Burst mode for no load regualtion
Feed-forward correction for near unity PF
Low Power
Soft Start    
SOIC | 16     16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)