UCC28710DR

UCC28710DR is Texas Instruments’ primary-side regulated (PSR) flyback controller. It drives an external MOSFET to regulate an isolated output without opto-isolation, making it well suited for offline adapters and battery chargers with universal input. Key features typically include a high-voltage startup current source, primary-side feedback for accurate regulation, fixed switching frequency, valley switching for high efficiency, and comprehensive protections (UVLO, OVP, current limit/short-circuit, soft-start, and enable). The DR suffix indicates a reel-packaged variant in a specific package. Common applications are compact, isolated power supplies such as wall adapters, USB chargers, and other low- to mid-power offline converters. For exact electrical specs (input range, switching frequency, efficiency, protection thresholds) refer to the UCC28710 datasheet and TI’s product page.

Here are the key features of the UCC28710DR (TI):
- Integrated high-voltage MOSFET (≈650 V) with current limit and thermal shutdown
- Valley-switching / quasi-resonant operation for high efficiency and reduced EMI
- Primary-Side Regulation (PSR) – regulatory feedback without opto-coupler
- Fixed-frequency operation (optimized for flyback topology; light-load efficiency enhancements)
- Current-mode control with fast transient response
- Soft-start to reduce inrush and limit peak current
- Protections: undervoltage lockout, overvoltage protection, overcurrent with hiccup/auto-retry, and thermal shutdown
- Fault latch with automatic retry and safe-state behavior
- Robust start-up architecture suitable for offline/off-grid adapters and chargers
- 8-pin package (DR/SOIC-style) suitable for compact flyback implementations
Note: Always consult the latest TI datasheet for exact electrical specs and recommended operating conditions.

- Pin count: 8 pins (8-pin package).
- Function: Off-line flyback controller with primary-side regulation (PSR) and valley switching. Drives an external flyback MOSFET, provides startup, current limit, and protection (overvoltage/short-circuit) to regulate the output without opto-isolation.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits.

Typical application areas for UCC28710DR (an active PFC controller with universal input) include:
- Universal-input AC‑DC power supplies with active PFC (85–265 VAC)
- External power adapters and battery chargers for consumer electronics
- LED lighting driver power supplies with high power factor
- Telecom and industrial off-line SMPS
- Desktop/monitor power supplies and other small to medium offline supplies

UCC28710DR is provided in an 8‑pin small‑outline package (SOIC).