Texas Instruments' UCC28950 enhanced, phase-shifted controller builds upon Texas Instruments' industry standard UCCx895 phase-shifted controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28950 implements advanced control of the full-bridge along with active control of the synchronous rectifier output stage.
The primary-side signals allow programmable delays to ensure ZVS operation over wide-load current and input voltage range, while the load current naturally tunes the secondary-side synchronous rectifiers switching delays, maximizing overall system efficiency. The UCC28950 also offers multiple light-load management features including burst mode and dynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM) operation, ensuring ZVS operation is extended down to much lighter loads.
| Features |
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- Enhanced wide range resonant zero voltage switching (ZVS) capability
- Direct synchronous rectifier (SR) control
- Light-load efficiency management including
- Burst mode operation
- Discontinuous conduction mode (DCM), dynamic SR On/Off control with programmable threshold
- Programmable adaptive delay
- Average or peak current mode control with programmable slope compensation and voltage mode control
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- Closed loop soft start and enable function
- Programmable switching frequency up to 1 MHz with bi-directional synchronization
- (+/-3%) cycle-by-cycle current limit protection with hiccup mode support
- 150 µA start-up current
- VDD under voltage lockout
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| Applications |
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- Phase-shifted full-bridge converters
- Server
- Telecom power supplies
- Industrial power systems
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- High-density power architectures
- Solar inverters
- Electric vehicles
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Texas Instruments' UCC28950 enhanced, phase-shifted controller builds upon Texas Instruments' industry standard UCCx895 phase-shifted controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28950 implements advanced control of the full-bridge along with active control of the synchronous rectifier output stage.
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