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High-density flyback controller for active-clamp (ACF) and zero-voltage switching (ZVS) topologies

US ECCN: EAR99 US/Local Export Classification Number

Quality information

RoHS Yes
Lead finish / Ball material NIPDAU
MSL rating / Peak reflow Level-2-260C-1 YEAR
Quality, reliability
& packaging information

Information included:

  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
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Packaging information

Package | Pins Package qty | Carrier: Operating temperature range (°C)
WQFN (RTW) | 24 3,000 | LARGE T&R -40 to 125
Package | Pins WQFN (RTW) | 24
Package qty | Carrier: 3,000 | LARGE T&R
Operating temperature range (°C) -40 to 125
View TI packaging information

Features for the UCC28782

  • Active clamp recovers leakage inductance energy

  • Adaptive control for fast zero voltage switching (ZVS) tracking and dead time optimization

  • Integrated switching bias regulator supports USB Type-C PD wide output voltage range with one auxiliary winding
  • EMI frequency dithering without trade-offs on transient response or audible noise
  • Dynamic bias power management for digital isolator and GaN driver
  • Programmable Adaptive Burst Mode (ABM) with internal compensation
  • Active X-capacitor (X-cap) discharge
  • Over-temperature, over-voltage, output short-circuit, over-current, over-power, and pin-fault protections
  • Auto-recovery and group-latch fault options with fast latch-reset capability

  • 4x4-mm 24-pin QFN package

Description for the UCC28782

The UCC28782 is a high-density active-clamp flyback (ACF) controller for USB Type C™ PD applications and allows for efficiencies over 93% by recovering the leakage inductance energy and adaptive ZVS tracking over the full load range.

With a maximum frequency of 1.5 MHz the magnetics can be minimized. Frequency dithering helps to improve EMI margin. The UCC28782 also integrates dynamic bias power management to optimize the gate drive for Si or GaN MOSFETs.

Adaptive Burst Mode (ABM) combined with Low Power Mode (LPM) and Standby Power mode (SBP) work together to increase light-load efficiency while reducing ripple and audible noise.

The UCC28782 also integrates an X-Cap discharge function to discharge the residual input voltage when power is removed.

The UCC28782 has multiple protection modes and options for retry or latch-off responses depending on the application needs. See Device Comparison Table.


Qty Price (USD)
1-99 1.725
100-249 1.425
250-999 1.023
1,000+ 0.77