Product details

Control mode Secondary-side regulation Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 17.5/10 Duty cycle (Max) (%) 99 Features SSR, Zero Voltage Switching, Soft Start, Light Load Efficiency, 1 MHz Switching Frequency, Input Line Monitor, OVP Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
Control mode Secondary-side regulation Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 17.5/10 Duty cycle (Max) (%) 99 Features SSR, Zero Voltage Switching, Soft Start, Light Load Efficiency, 1 MHz Switching Frequency, Input Line Monitor, OVP Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
SOIC (D) 16 59 mm² 9.9 x 6 WQFN (RTE) 16 9 mm² 3 x 3
  • Full and Partial Zero Voltage Switching (ZVS) of Primary FET with Adaptive Control
  • Programmable Timing for External Si or GaN FETs
  • High Switching Frequency up to 1 MHz
  • Programmable Adaptive Burst Control and Standby Mode for Light-Load Efficiency with Low Output Ripple and Audible Noise Mitigation
  • Brownout Detection without Direct Line Sensing
  • Accurate Programmable Over-Power Protection (OPP) to Support Peak Power Mode
  • Fault Protections: Over-Temperature, Output Over-Voltage, Output Short-Circuit, Over-Current, and Pin Fault
  • Direct Interface with Optocoupler Based Feedback Allows for Dynamically Scalable Output Voltage
  • Internal Soft Start
  • NTC Thermistor Interface with External Enable
  • Full and Partial Zero Voltage Switching (ZVS) of Primary FET with Adaptive Control
  • Programmable Timing for External Si or GaN FETs
  • High Switching Frequency up to 1 MHz
  • Programmable Adaptive Burst Control and Standby Mode for Light-Load Efficiency with Low Output Ripple and Audible Noise Mitigation
  • Brownout Detection without Direct Line Sensing
  • Accurate Programmable Over-Power Protection (OPP) to Support Peak Power Mode
  • Fault Protections: Over-Temperature, Output Over-Voltage, Output Short-Circuit, Over-Current, and Pin Fault
  • Direct Interface with Optocoupler Based Feedback Allows for Dynamically Scalable Output Voltage
  • Internal Soft Start
  • NTC Thermistor Interface with External Enable

UCC28780 is a high-frequency active-clamp flyback controller that enables high-density AC-to-DC power supplies that comply with stringent global efficiency standards such as DoE Level VI and EU CoC V5 Tier-2. User programmable advanced control law features allow performance to be optimized for both Silicon (Si) and Gallium Nitride (GaN) power FETs. Direct operation with switching devices that combine driver and GaN FETs is further enhanced with logic-level gate signals and enable outputs.

Zero voltage switching (ZVS) is achieved over a wide operating range with advanced auto-tuning techniques, adaptive dead-time optimization, and variable switching frequency control law. Using adaptive multimode control that changes the operation based on input and output conditions, UCC28780 enables high efficiency while mitigating audible noise. With a variable switching frequency of up to 1 MHz and accurate programmable over-power protection, which provides consistent power for thermal design across wide line range, the size of passive components can be further reduced and enable high power density.

UCC28780 works with VDS-sensing synchronous rectifier controllers, such as UCC24612, to achieve higher conversion efficiency and very compact designs.

UCC28780 is a high-frequency active-clamp flyback controller that enables high-density AC-to-DC power supplies that comply with stringent global efficiency standards such as DoE Level VI and EU CoC V5 Tier-2. User programmable advanced control law features allow performance to be optimized for both Silicon (Si) and Gallium Nitride (GaN) power FETs. Direct operation with switching devices that combine driver and GaN FETs is further enhanced with logic-level gate signals and enable outputs.

Zero voltage switching (ZVS) is achieved over a wide operating range with advanced auto-tuning techniques, adaptive dead-time optimization, and variable switching frequency control law. Using adaptive multimode control that changes the operation based on input and output conditions, UCC28780 enables high efficiency while mitigating audible noise. With a variable switching frequency of up to 1 MHz and accurate programmable over-power protection, which provides consistent power for thermal design across wide line range, the size of passive components can be further reduced and enable high power density.

UCC28780 works with VDS-sensing synchronous rectifier controllers, such as UCC24612, to achieve higher conversion efficiency and very compact designs.

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Technical documentation

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Type Title Date
* Data sheet UCC28780 High Frequency Active Clamp Flyback Controller datasheet (Rev. A) 22 Feb 2018
Analog design journal Transformer structures that achieve low EMI with low- and high-side rectifiers 22 Sep 2020
Application note Zero-Voltage-Switching Flyback Using UCC28780 Controller and UCC5304 Isolated Sy 30 Jul 2020
Application note Minimize Standby Consumption for UCC287XX Family 01 Aug 2019
Application note Debugging UCC28780 ACF Converter Start-up Issues 15 Jul 2019
Technical article Gain ultra-high power density for 100-W USB Power Delivery adapters 05 Mar 2019
Technical article Searching for the newest innovations in power? Find them at APEC 09 Feb 2019
Application note Selecting Electrolitic Bus Capacitor for Universal Input 17 Jul 2018
User guide Using the UCC28780EVM-021 15 May 2018
Technical article Measuring efficiency, the right way 12 Mar 2018
Technical article Intelligently control an active clamp flyback 01 Mar 2018
Application note Increasing Power Density With Active Clamp Flyback (UCC28780) 27 Feb 2018
User guide Using the UCC28780EVM-002 (Rev. A) 07 Feb 2018

Design & development

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

Evaluation board

UCC28780EVM-002 — UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET

The UCC28780EVM-002 demonstrates high-efficiency and high-density for a 45-W off-line adapter using the UCC28780 active-clamp flyback controller at high frequency nominal 300 kHz using GaN MOSFET Power ICs, NV6115 and NV6117.  The EVM also uses the UCC24612 synchronous rectifier controller on (...)

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Evaluation board

UCC28780EVM-021 — UCC28780 active clamp flyback converter 45W EVM with UCC24612 and Si MOSFET

The UCC28780EVM-021 is a 45-W evaluation module (EVM) for evaluating an off-line active-clamp flyback adapter for notebook charging and other applications. The EVM meets CoC Tier 2 and DoE Level 6 efficiency requirements. It is intended for evaluation purposes and is not intended to be an end (...)

In stock
Limit: 2
Support software

UCC28780 Excel Design Calculator (Rev. C)

SLUC664C.ZIP (533 KB)
Simulation model

UCC28780 GaN SIMPLIS Model

SLUM626.ZIP (393 KB) - SIMPLIS Model
Simulation model

UCC28780 Si SIMPLIS Model

SLUM643.ZIP (406 KB) - SIMPLIS Model
Calculation tool

UCC28780 Mathcad Design Calculator

SLUC644.ZIP (8301 KB)
Reference designs

PMP21479 — 65W Active clamp flyback with Si FETs reference design for a high power density 5-20V AC/DC adapter

This reference design uses the UCC28780 active clamp flyback controller to generate a 20-V/15-V/9-V/5-V adjustable output voltage. The maximum power rating is 65 W at 20-V output and up to 3 A at all other output voltage settings. This design reaches a peak efficiency of over 93% using silicon (...)
Reference designs

PMP21552 — 65-W USB Type-C ZVS-flyback reference design

This reference design is a low-cost, high-density USB adapter that uses the UCC28780 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 voltage and 3 A.  This (...)
Reference designs

PMP21639 — 65-W USB Type-C™ high density active clamp flyback with GaN reference design

This reference design is a high density USB adapter that uses the UCC28780 active clamp flyback controller and LMG3411R150 GaN with integrated driver and protection. The maximum power rating is 65W at 20V output but is adjustable for 20V/15V/9V/5V output voltage and 3A.  This design reaches a (...)
Reference designs

TIDA-01622 — 30-W/in3, 94% Efficiency, 65-W USB Type-C PD AC/DC adapter reference design

This fully tested, USB power delivery reference design is a high efficiency, high power density, AC/DC adapter solution with a wide input voltage range (85 - 265VAC) for laptop adapters and smartphone charger applications. It adopts active-clamp-flyback topology controlled by TI’s newest ACF (...)
Reference designs

TIDA-010047 — 22-W/in3, 93.1% peak efficiency, 100-W USB-PD 3.0 AC/DC adapter reference design with Si MOSFET

This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC) (...)
Reference designs

PMP30720 — High efficiency, ultra-wide input (20 VDC to 375 VDC) isolated power supply reference design

This reference design uses the UCC28C42 boost controller and the UCC28780 active-clamp flyback controller to generate an isolated output of 24 V at 3.5 A over an ultra-wide input voltage range of 20 V to 375 V. The design also uses the UCC24612 synchronous rectifier controller on the secondary (...)
Reference designs

PMP30631 — High efficiency, 70-W AC/DC active clamp flyback reference design

This reference design uses the UCC28780 active clamp flyback controller to generate an isolated output of 20 V @ 3.5 A over an input voltage rage of 90 Vac to 264 Vac. The design also uses the UCC24612 synchronous rectifier controller on the secondary side. Zero voltage switching (ZVS) ensures (...)
Reference designs

TIDA-01623 — 30-W/in3, 93.4% efficiency, 100-W AC/DC adapter reference design

This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC) (...)
Reference designs

PMP40328 — High Efficiency, High Power Density Active Clamp Flyback Adapter with SJ FET Reference Design

PMP40328 is a maximum 9V 5A reference design for high frequency and high density adapter applications. The solution implements a high efficiency active clamp flyback  controller UCC28780 and secondary rectifier controller UCC24612-2. The efficiency is around 90% at full load. Integrated input (...)
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SOIC (D) 16 View options
WQFN (RTE) 16 View options

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