NCP1937B1DR2G

NCP1937B1DR2G is an ON Semiconductor switch-mode power supply controller in the NCP1937 family. It’s a high‑voltage, current‑mode PWM controller used to implement SMPS topologies (offline flyback, buck/boost, LED drivers, etc.).
Key points:
- Function: PWM controller with current-mode control, designed to drive an external MOSFET (or used with an integrated MOSFET in some variants).
- Protections: typical PD/overcurrent, short‑circuit, undervoltage lockout, thermal shutdown, and soft-start to improve startup reliability.
- Applications: isolated and non‑isolated SMPS, flyback converters, LED drivers, and other low-to-medium power supplies.
- Package: RoHS‑compliant small‑outline package (DR2G variant indicates the specific package/reel options).
Note: for exact electrical specs, recommended use cases, and pinout, refer to the NCP1937B1DR2G datasheet and application notes from ON Semiconductor.

Equivalents depend on the chip’s function and package. I don’t have a live cross-reference database for NCP1937B1DR2G. To get precise substitutes, provide: (1) function (buck regulator/controller), (2) input range, (3) output current/voltage, (4) switching frequency, (5) package. Or search distributor cross-refs (DigiKey/Mouser) for NCP1937B1DR2G and compare specs. Similar parts from TI, Renesas, Rohm, Richtek with matching parameters are potential candidates.

Pin count: 8 pins (8‑lead package).
Function: NCP1937B1DR2G is an LED driver controller/power regulator (current‑mode PWM controller) intended to drive an external MOSFET for constant‑current LED string regulation, with protection features (overcurrent/thermal).

- Manufacturer: ON Semiconductor (ON).
- What kind of company: American multinational semiconductor manufacturer that designs, manufactures, and sells analog, power-management, sensor, and other ICs for automotive, industrial, and consumer markets.

Applications of NCP1937B1DR2G:
- Offline switch‑mode power supplies using flyback topology (AC‑DC adapters, wall worts)
- Constant‑current LED driver supplies
- Battery chargers and charging circuits
- Auxiliary/standby rails for consumer electronics
- General low‑ to mid‑power SMPS in TVs, monitors, set‑top boxes and similar devices

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