UC2879DW

UC2879DW is a Texas Instruments PWM controller IC in the UC2879 family, used for off-line switch-mode power supplies. It provides primary‑side control of the switching regulator (typically in isolated flyback/forward converters) and includes protection features to simplify SMPS design. The “DW” suffix denotes a specific package variant (e.g., a DIP-8/SO-8 wide package). Main roles and features commonly supported: regulating the output by controlling the switching duty cycle, protection (undervoltage lockout, current limit/overcurrent protection, etc.), and an adjustable oscillator frequency for setting switching speed. It is designed to streamline designs for adapters, power bricks, and other isolated power supplies by integrating key control and protection functions. For exact electrical specs, application details, and pinout, refer to the UC2879DW datasheet.

Do you need exact cross-ref with the same pinout and HV specs? UC2879DW is a high-voltage, current‑mode PWM controller (Unitrode/TI). TI doesn’t publish a simple direct replacement. For substitutes, look at other high‑voltage PWM controllers with similar specs (e.g., NCP12xx/NCP125x, VIPer, TEA176x) only if pinout and performance match. Please share your target package, input voltage, and switching frequency to propose concrete equivalents or use TI’s cross-reference tool.

Key features of UC2879DW (typical):
- High-voltage startup regulator (up to ~650 V) for off-line operation
- Primary-side current-mode PWM control with valley current limit
- Internal oscillator for switching frequency (programmable/fixed range)
- Thermal shutdown protection
- Overcurrent/short-circuit protection
- Overvoltage protection
- Undervoltage lockout with safe-start behavior
- Soft-start and current-slope ramp for stable startup
- Suitable for flyback converters and CV/CC LED/adapter applications
- 8-pin DW package (compact, DIP/SOIC variant)
Note: Always refer to the official datasheet for exact electrical specs and recommended operating ranges.

- Pin count: 8 pins (DIP-8/SO-8, suffix DW indicates a 8-pin package).
- Function: UC2879DW is an 8-pin PWM controller for switch-mode power supplies (e.g., flyback/forward). It provides a current-mode control loop with an internal reference, an error/feedback input, a current-sense input, an oscillator (RT/CT timing), and an output to drive the switching element, plus protection features.

Manufacturer: Texas Instruments (TI).
What kind of company: TI is an American multinational technology company that designs and manufactures semiconductors and integrated circuits for a wide range of electronics applications.

UC2879DW is a high‑voltage, current‑mode PWM controller used in off‑line isolated SMPS. Typical applications include:
- Flyback converters for AC adapters and wall‑wart supplies
- Standby/auxiliary power for consumer electronics
- Isolated DC–DC converters in telecom/industrial equipment
- LED constant‑current driver circuits
- Battery chargers and small to medium‑power power supplies
(Designed for high‑voltage startup and regulation in compact power supplies.)

8-pin wide SOIC (surface-mount) package.