UCC28780

ACTIVE

Adaptive zero voltage switching active-clamp flyback controller

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Product details

Parameters

Control method Secondary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 17.5/10 Features SSR, Zero Voltage Switching Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

SOIC (D) 16 59 mm² 9.9 x 6 WQFN (RTE) 16 9 mm² 3 x 3 open-in-new Find other Flyback controllers

Features

  • 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

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Description

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
* Datasheet UCC28780 High Frequency Active Clamp Flyback Controller datasheet (Rev. A) Feb. 22, 2018
Application notes Minimize Standby Consumption for UCC287XX Family Aug. 01, 2019
Application notes Debugging UCC28780 ACF Converter Start-up Issues Jul. 15, 2019
Technical articles Gain ultra-high power density for 100-W USB Power Delivery adapters Mar. 05, 2019
Technical articles Searching for the newest innovations in power? Find them at APEC Feb. 08, 2019
Application notes Selecting Electrolitic Bus Capacitor for Universal Input Jul. 17, 2018
User guides Using the UCC28780EVM-021 May 15, 2018
Technical articles Measuring efficiency, the right way Mar. 12, 2018
Technical articles Intelligently control an active clamp flyback Mar. 01, 2018
Application notes Increasing Power Density With Active Clamp Flyback (UCC28780) Feb. 27, 2018
User guides Using the UCC28780EVM-002 (Rev. A) Feb. 07, 2018

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

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 (...)

Features
  • 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, GaN MOSFET Power IC, and synchronous rectification
  • High Efficiency (> 94%), High Power Density (> 20W/in3), Low Standby Power (55mW), and High Switching Frequency (300kHz)
  • Exceeds EU Code of Conduct and US Department of Energy (...)
EVALUATION BOARDS Download
document-generic User guide
$149.00
Description

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 (...)

Features
  • 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, Si MOSFET Power IC, and synchronous rectification.
  • High Efficiency (> 93%), High Power Density (> 20W/in3), Low Standby Power (55mW), and High Switching Frequency (300kHz).
  • Exceeds EU Code of Conduct and US Department of Energy (...)

Software development

SUPPORT SOFTWARE Download
SLUC664C.ZIP (533 KB)

Design tools & simulation

SIMULATION MODELS Download
SLUM626.ZIP (393 KB) - SIMPLIS Model
SIMULATION MODELS Download
SLUM643.ZIP (406 KB) - SIMPLIS Model
CALCULATION TOOLS Download
SLUC644.ZIP (8301 KB)

Reference designs

REFERENCE DESIGNS Download
65W Active clamp flyback with Si FETs reference design for a high power density 5-20V AC/DC adapter
PMP21479 — 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 FETs (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
65-W USB Type-C ZVS-flyback reference design
PMP21552 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
22-W/in3, 93.1% peak efficiency, 100-W USB-PD 3.0 AC/DC adapter reference design with Si MOSFET
TIDA-010047 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High efficiency, ultra-wide input (20 VDC to 375 VDC) isolated power supply reference design
PMP30720 — 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 side (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High efficiency, 70-W AC/DC active clamp flyback reference design
PMP30631 — 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 high (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30-W/in3, 94% Efficiency, 65-W USB Type-C PD AC/DC adapter reference design
TIDA-01622 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30-W/in3, 93.4% efficiency, 100-W AC/DC adapter reference design
TIDA-01623 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency, High Power Density Active Clamp Flyback Adapter with SJ FET Reference Design
PMP40328 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 16 View options
WQFN (RTE) 16 View options

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