UCC28250RGPR

UCC28250RGPR is Texas Instruments’ high-voltage PWM controller for flyback power supplies. It’s intended for offline AC-DC adapters, chargers, and isolated power modules, and requires an external MOSFET.
Key points:
- Drives a flyback topology with current-mode PWM and valley-switching to improve efficiency and reduce losses/EMI.
- Includes a high-voltage startup source, undervoltage lockout, overcurrent/short-circuit protections, and thermal shutdown; features soft-start to limit inrush.
- Frequency is programmable to balance efficiency, size, and EMI considerations.
- RGPR denotes the specific packaging variant for surface-mount use (RoHS-compliant, 8-pin style).
Typical applications: small-to-medium isolated power supplies such as USB/phone chargers, telecom adapters, TV/monitors power bricks, and LED drivers.
For exact pinout, electrical characteristics, and design guidelines, see the TI UCC28250 datasheet and application notes.

There isn’t a single direct cross-reference for UCC28250RGPR. For a drop-in substitute, match topology and specs (8-pin package, off-line flyback current‑mode PWM). Possible equivalents from other vendors include: Onsemi NCP1250/NCP1251 (NCP12xx family); ST VIPER family (VIPER12A, VIPER16); Power Integrations LNK/TOPSwitch families; TI equivalents in the UCC28xx line such as UCC28150 or UCC28700. Use TI’s cross-reference tool for an exact replacement.

Here are the key features of the UCC28250RGPR (QR/PSR flyback controller):
- Quasi-Resonant (QR) valley-switching for high efficiency and reduced EMI.
- Primary-Side Regulation (PSR) — regulation without opto-coupler.
- Current-mode PWM with cycle-by-cycle current limiting.
- Universal/wide input range for off-line operation (typical 85–265 VAC).
- Integrated high-voltage startup current source and a high-voltage switch drive (VDS rating around the 600–700 V range, per device).
- Soft-start to minimize inrush and improve line/load regulation.
- Protection suite: overcurrent/short-circuit, overvoltage, undervoltage lockout, and thermal shutdown (with auto-restart).
- Enable/disable/control pins for simple system integration.
- Compact 8-pin package (RGPR variant) suitable for space-conscious designs.
Note: exact voltage ratings, frequency, and mode details may vary by revision; consult the datasheet for precise specs.

- Pin count: 8 pins (8-pin package, RGPR variant)
- Function: High-voltage primary-side PWM controller for isolated flyback/off-line SMPS; provides current‑mode control to regulate the output, with startup and protection features (OC/OV/OTP, etc.).

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and mixed-signal ICs, embedded processing, and related semiconductor products.

Application areas of UCC28250RGPR:
- Off-line isolated switch‑mode power supplies (universal input, typical flyback)
- LED lighting drivers (constant-current, flicker‑free)
- General‑purpose DC‑DC converters in telecom, industrial and consumer electronics
- Battery chargers and portable power adapters
Designed for compact, high‑efficiency SMPS with fast transient response.

UCC28250RGPR is in an 8‑pin Small-Outline IC package (SOIC), RoHS‑compliant.