UC2842BNG

UC2842BNG is an 8-pin current‑mode PWM controller used in switch‑mode power supplies (SMPS). It belongs to the UC2842 family and is designed to drive a primary-side power switch (MOSFET) in flyback/forward converters, regulating the output via feedback.
Key features (typical):
- Internal high‑voltage startup current source and undervoltage lockout
- Adjustable oscillator frequency for PWM
- Current-sense input and error-amplifier input with a COMP output
- Soft-start and protection options (overcurrent/short-circuit)
- RoHS/lead-free packaging indicated by the NG suffix
How it works (high level): from rectified mains, the IC powers itself, senses primary current, compares it to the feedback error signal, and modulates the PWM output to regulate the secondary output through the SMPS topology and an external MOSFET.
Typical uses: offline AC‑DC adapters, LED drivers, telecom power supplies, and other low-to-medium power SMPS.
For exact pinout, electrical specs, and application notes, consult the UC2842BNG datasheet.

UC2842BNG is a current‑mode PWM controller for switching power supplies. Key features include:
- Current‑mode PWM control for flyback/forward topologies
- Fixed-frequency oscillator (set externally with components)
- Internal high‑voltage startup current source
- Internal 5V reference for the error amplifier
- Error amplifier with feedback input for regulation
- Undervoltage lockout (UVLO)
- Cycle‑by‑cycle current limit protection
- Overload/short‑circuit protection and thermal shutdown
- Soft‑start to reduce inrush and overshoot
- Gate‑drive output suitable for switching MOSFETs
- Available in DIP‑8 package (BNG)
Note: exact electrical specs (frequencies, voltage ranges) are in the datasheet.

Pin count: 8 pins (DIP-8/SO-8; the BNG variant is the RoHS/lead-free version).
Function: UC2842BNG is an off-line switching-mode PWM controller (current-mode control) used in flyback/forward converters. It provides: startup current, undervoltage lockout, a 5V reference (Vref) for feedback, a feedback input (FB) via optocoupler, a compensation input (COMP) for the error amplifier, a current-sense input (IS) for primary current sensing and limiting, an oscillator whose frequency is set by external components (RT/CT), and an OUTPUT pin to drive the main switching device.

- Manufacturer: Texas Instruments (TI).
- Company type: A global semiconductor company that designs and manufactures analog and embedded processing integrated circuits.

UC2842BNG is a current‑mode PWM controller used in off‑line switch‑mode power supplies. Typical applications include isolated flyback and forward converters for wall‑wart and desktop adapters, telecom/industrial power supplies, LED constant‑current drivers, and battery charging circuits. It is suitable for low‑ to medium‑power SMPS (tens of watts) in consumer electronics and general‑purpose DC‑DC converter designs.

UC2842BNG comes in an 8-pin DIP package (DIP-8), RoHS-compliant/green package.