UCC25630-2DDBR

UCC25630-2DDBR is TI’s primary-side regulated, quasi-resonant flyback controller. It drives an external high-voltage MOSFET to implement an isolated flyback converter and uses primary-side regulation (PSR), so feedback can be done without an opto-isolator in many designs.
Key points
- Quasi-resonant, valley-switching operation to reduce switching losses
- External MOSFET required (high-voltage drive capability)
- Primary-side regulation (PSR) for simplified feedback and improved EMI/accuracy
- Versatile protection suite: undervoltage, overcurrent/short-circuit, overvoltage, and thermal protection
- Current-mode control with slope compensation; adaptable switching behavior and wide input range
- Suitable for offline AC-DC adapters, battery chargers, and LED/offline power supplies (tens of watts)
Package/variant
- -DDBR denotes the specific TI package/lead-frame variant for this part.
In short: a compact, efficient controller for isolated offline SMPS using PSR and valley switching, with robust protection and no mandatory optocoupler feedback.

Key features of UCC25630-2DDBR (TI)
- Integrated high-voltage MOSFET: 650–700 V device for offline flyback applications
- Quasi-resonant valley-switching: reduced switching losses and EMI
- Primary-side regulation (PSR) capable: optocoupler-free regulation in suitable flyback designs
- Universal input range: 85–265 VAC
- Programmable switching behavior: adjustable frequency with valley-detection
- Control: peak current-mode with cycle-by-cycle current limit
- Protection suite: UVLO, overvoltage, overcurrent, thermal shutdown, and latch/hiccup modes
- Soft-start for controlled startup and reduced inrush
- Low standby power and high overall efficiency
- Packaging: 8-pin DDBR (RoHS-compliant) option for compact designs
Note: Specifications may vary by exact device revision; consult the datasheet for precise electricals and recommended operating ranges.

8-pin Small Outline Integrated Circuit (SOIC) package (D-type), RoHS-compliant.

8 pins. It is a high-voltage, fixed-frequency PWM controller for off-line flyback converters, with an integrated power MOSFET (valley/critical conduction switching) and protection features (UVLO, current limit, OVP) used in AC-DC power supplies.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits, sensors, and related semiconductor products, with global operations and headquartered in Dallas, Texas.

Typical applications include offline AC-DC flyback power supplies (wall adapters, battery chargers, standby/auxiliary rails) for consumer electronics; telecom and industrial power supplies; designs requiring high efficiency and low standby power.