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UCC28950PWR

Phase-shift full-bridge controller, ZVS, sync rect, 1MHz, burst mode, TSSOP-20

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Manufacturer Part：

UCC28950PWR

Package：

TSSOP-20 (6.50 x 4.40 x 1.05 mm)

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Description

Product Overview

The UCC28950PWR from Texas Instruments is a phase-shift full-bridge controller with synchronous rectification output. Operating at up to 1 MHz switching frequency, it achieves high efficiency through zero-voltage switching (ZVS) and adaptive synchronous rectifier control. With programmable slope compensation, peak current mode control, and burst mode for light-load efficiency, it targets 200W-1kW isolated power converters in a 20-pin TSSOP package.

Key Specifications

Type Phase-Shift Full-Bridge Controller
Topology Phase-Shift Full-Bridge with SR
Control Mode Peak Current Mode
Switching Frequency Up to 1 MHz
Output Voltage Ref 0.75V (+/-1%)
Sync Rect Control Adaptive (Out-of-Phase + Predictive)
Light Load Mode Burst mode for efficiency
Supply Voltage 8.2V – 15V (UVLO 7.3V start)
Package TSSOP-20 (PWR)
Operating Temp -40 to 125 C

Features

  • Phase-shift full-bridge control for ZVS operation
  • Adaptive synchronous rectifier timing for high efficiency
  • Programmable burst mode for light-load efficiency
  • Peak current mode control with slope compensation
  • Sync-to-primary clock output for cascaded designs
  • Programmable output over-voltage protection
  • Enable and UVLO with programmable hysteresis
  • 400 kHz to 1 MHz switching frequency range

Applications

  • Server and telecom DC-DC bus converters
  • Industrial power supplies (200W-1kW)
  • Battery charger and renewable energy
  • LED lighting power supplies
  • Electric vehicle on-board chargers

The UCC28950PWR from Texas Instruments is an advanced phase-shift full-bridge controller with integrated synchronous rectifier control. It enables zero-voltage switching (ZVS) across a wide load range by controlling the phase relationship between the two half-bridge legs. The adaptive synchronous rectifier timing algorithm combines out-of-phase and predictive methods to minimize body-diode conduction, achieving high efficiency in both heavy and light-load conditions. With programmable burst mode, peak current mode control, and a switching frequency range of 400 kHz to 1 MHz, it targets high-power isolated DC-DC converters from 200W to 1kW.

The UCC28950PWR controls a full-bridge converter by phase-shifting the switching of one half-bridge relative to the other. During the overlap period when both switches in a leg are off, the transformer leakage inductance resonates with the MOSFET capacitances, achieving ZVS turn-on. The controller uses peak current mode with a leading-edge blanking circuit and programmable slope compensation for stability. The synchronous rectifier driver timing adapts dynamically: at heavy loads it uses the OUTE/OUTF signals in out-of-phase mode, while at light loads predictive timing compensates for the reduced energy available for commutation. Burst mode disables switching cycles when the load drops below a programmable threshold, reducing switching losses at light load.

Pin Name Type Function
1 SS/EN I/O Soft-start / enable
2 COMP I/O Error amplifier output / compensation
3 FB Input Voltage feedback (0.75V ref)
4 RSLOPE Input Slope compensation resistor
5 RT Input Switching frequency programming
6 BURST Input Burst mode threshold
7 SYNC I/O Clock sync input/output
8 CS Input Current sense input
9 GND Ground Ground
10 VDD Power Supply (8.2-15V)
11-14 OUTA-D Output Full-bridge gate drives
15-16 OUTE-F Output Sync rectifier gate drives
17-20 Misc – OA/OB, REF, PWRGND
  • Server DC-DC: 48V-to-12V bus converters with ZVS full-bridge
  • Telecom rectifiers: Isolated 300W+ DC-DC with synchronous rectification
  • Battery chargers: Constant-current/constant-voltage phase-shift control
  • EV on-board chargers: High-efficiency isolated PFC output stage
  • Industrial power: High-power supplies requiring wide-load-range efficiency
Manufacturer Part Number Package Notes
TI UCC28951PWR TSSOP-20 Enhanced version, improved SR timing
TI LM5046MH HTSSOP-20 Phase-shift full-bridge, 100V input
Infineon ICE2HS01G DSO-14 Phase-shift full-bridge controller
TI UCC28910DR SOIC-8 Primary-side regulated flyback
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