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Flyback controllers

UCC28782

ACTIVE

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

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Data sheet

UCC28782

ACTIVE
Data sheet Order now

Product details

Control mode Secondary-side regulation UVLO thresholds on/off (V) 17/10.5 Features Integrated Switching Bias Regulator, SSR, Zero Voltage Switching, OVP, Adaptive Burst Mode, X-Cap Discharge Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
Control mode Secondary-side regulation UVLO thresholds on/off (V) 17/10.5 Features Integrated Switching Bias Regulator, SSR, Zero Voltage Switching, OVP, Adaptive Burst Mode, X-Cap Discharge Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
WQFN (RTW) 24 16 mm² 4 x 4

  • 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

  • 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet UCC28782 High-Density Active-Clamp Flyback Controller with EMI Dithering, X-Cap Discharge, and Bias Power Management datasheet (Rev. D) PDF | HTML 20 May 2021
EVM User's guide Using the UCC28782EVM-030 (Rev. C) PDF | HTML 28 Jul 2022
Application note Flyback Selection Guide PDF | HTML 23 Jun 2022
Application note UCC28782 Practical Design Guidelines PDF | HTML 15 Oct 2021
Application note UCC28782 System Bring Up Guideline and Common Issues PDF | HTML 29 Sep 2021
Analog Design Journal Transformer structures that achieve low EMI with low- and high-side rectifiers 22 Sep 2020
Certificate UCC28782EVM-030 EU Declaration of Conformity (DoC) (Rev. A) 29 Jun 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC28782EVM-030 — UCC28782 active clamp flyback converter 65-W USB-C PD EVM with LMG2610 integrated GaN half-bridge

UCC28782EVM-030 demonstrates high-efficiency and high-density for a 65-W USB Type-C™ power delivery (PD) off-line adapter using the UCC28782 active-clamp flyback controller.  The input supports a universal 90 Vac to 264 Vac and the single output can be set to 5 V, 9 V and 15 V all at 3-A (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

UCC28782 SIMPLIS Model with 65W GaN ACF

SLUM740.ZIP (617 KB) - SIMPLIS Model
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Calculation tool

UCC28782 Design Calculator Tool (Rev. C)

SLURAZ0C.ZIP (831 KB)
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Reference designs

PMP22244 — 60-W USB Type-C® high-density active clamp flyback with GaN reference design

This reference design is a high-density, 60-W 115-VAC input power supply for USB Type-C applications that uses the UCC28782 active clamp flyback controller, LMG2610 integrated GaN half-bridge and UCC24612 synchronous rectifier driver. The maximum power rating is 60 W at 20-V or 15-V output, 54 W at (...)
Test report: PDF
Reference designs

PMP40974 — High-power density 65-W, USB Type-C®, charger using active clamp flyback reference design

This reference design is a 65-W, high-power density USB charger using the UCC28782 active-clamp flyback controller achieving 30-W/in power density. The maximum power rating is 65-W at 20-V VOUT across a universal AC-input range. VOUT is also adjustable to 20-, 15-, 9-, and 5-V output voltage and 3 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP22322 — 65-W USB Type-C® ZVS-flyback reference design

This reference design is a low-cost, high-density USB adapter that uses the UCC28782 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-V/15-V/9-V/5-V output voltages and 3 A. This design (...)
User guide: PDF
Schematic: PDF
Package Pins Download
WQFN (RTW) 24 View options

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