Product details

Control mode Secondary-side regulation Frequency (Max) (kHz) 1500 UVLO thresholds on/off (V) 17/10.5 Features 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 Frequency (Max) (kHz) 1500 UVLO thresholds on/off (V) 17/10.5 Features 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
  • Switching frequency: > 500 kHz
  • Enables peak efficiency > 93 %
  • Enables < 45 mW stand-by power
  • Adaptive control for zero-voltage-switching (ZVS) and dead-time optimization
  • EMI frequency-dithering without trade-offs on transient response or audible noise
  • Programmable adaptive burst mode (ABM) with internal compensation
  • X-capacitor discharge capability
  • Over-temperature, overvoltage, output short-circuit, overcurrent, over-power, and pin-fault protections
  • Auto-recovery fault-responses
  • 4 mm × 4 mm, 24-pin, QFN package
  • Switching frequency: > 500 kHz
  • Enables peak efficiency > 93 %
  • Enables < 45 mW stand-by power
  • Adaptive control for zero-voltage-switching (ZVS) and dead-time optimization
  • EMI frequency-dithering without trade-offs on transient response or audible noise
  • Programmable adaptive burst mode (ABM) with internal compensation
  • X-capacitor discharge capability
  • Over-temperature, overvoltage, output short-circuit, overcurrent, over-power, and pin-fault protections
  • Auto-recovery fault-responses
  • 4 mm × 4 mm, 24-pin, QFN package

The UCC28781 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density.

With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.)

Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range.

The programmable adaptive burst mode (ABM) gives flexibility to control when the controller enters and exits standby mode to optimize standby power in light and no-load conditions. ABM also helps to reduce ripple and minimize audible noise.

The controller offers multiple protection modes with automatic restart (retry) responses.

The UCC28781 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density.

With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.)

Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range.

The programmable adaptive burst mode (ABM) gives flexibility to control when the controller enters and exits standby mode to optimize standby power in light and no-load conditions. ABM also helps to reduce ripple and minimize audible noise.

The controller offers multiple protection modes with automatic restart (retry) responses.

Download

Similar products you might be interested in

open-in-new Compare products
Same functionality with different pin-out to the compared device.
UCC28782 ACTIVE High-density flyback controller for active-clamp (ACF) and zero-voltage switching (ZVS) topologies Active clamp flyback controller for higher power density and increased efficiency.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 3
Type Title Date
* Data sheet UCC28781 Zero-Voltage-Switching Flyback Controller with Dedicated Synchronous Rectifier Gate-Drive datasheet 08 Dec 2021
Certificate UCC28781EVM-053 EU RoHS Declaration of Conformity (DoC) 19 Aug 2021
User guide Using the UCC28781EVM-053 Zero-Voltage-Switching Flyback Converter 30 Jun 2021

Design & development

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

Package Pins Download
WQFN (RTW) 24 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos