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Texas Instruments UCC28781-Q1 | Demoboard UCC28781EVM-053
UCC28781 Zero-Voltage-Switching Flyback Controller with Dedicated Synchronous Rectifier Gate-Drive
Overview
| Topology | Flyback Converter |
| Input voltage | 90-264 V |
| Output 1 | 15 V |
Description
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.
Features
- 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 shortcircuit, overcurrent, over-power, and pin-fault protections
- Auto-recovery fault-responses
- 4 mm × 4 mm, 24-pin, QFN package
Typical applications
- Industrial AC-DC
- Appliances Battery Charger, Merchant Battery Charger
- Soundbar, Smart Speaker
- Merchant Network and Server PSU
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | VR(V (AC)) | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | L(mm) | W(mm) | H(mm) | Packaging | L(µH) | IR(A) | RDC max.(Ω) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-FTX2 Film Capacitors, Across the mains, 330 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | Capacitance330 nF | Rated Voltage275 V (AC) | Safety ClassX2 | Rate of Voltage Rise260 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch12.5 mm | Length15 mm | Width8.5 mm | Height14 mm | PackagingBulk | – | – | – | ||||
 | WE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | – | Length10 mm | Width6.6 mm | – | – | Inductance32 µH | Rated Current2.6 A | DC Resistance0.045 Ω |