FAN4800AUM

FAN4800AUM is a power-management IC from the FAN4800 family, normally used as a primary‑side flyback controller in off‑line SMPS (AC‑DC adapters, chargers, etc.). It provides PWM control for an external MOSFET, with features like startup current, undervoltage lockout (UVLO), current‑mode control, and protections such as overcurrent and thermal shutdown. It is designed for fixed‑frequency flyback operation and is typically used with a few external passive components to form the regulator.
The “AUM” suffix indicates a specific package/variant (an 8‑pin package is common) and temperature/lot code; exact pinout and electrical specs are defined in the manufacturer’s datasheet.
For a precise introduction, review the official FAN4800AUM datasheet and app notes. If you share your target input/output and power, I can help interpret the key parameters (input range, switching frequency, current sense, and protection thresholds) relevant to your design.

- Pin count: 8 pins (UM/SO-8 style).
- Function: High-voltage PWM controller for flyback-type switch-mode power supplies (SMPS) with an integrated MOSFET, used in AC-DC adapters.

Manufacturer: Fairchild Semiconductor (historically for the FAN4800AUM; now part of ON Semiconductor).
What kind of company: A multinational semiconductor company that designs, manufactures, and sells integrated circuits and discrete electronic components (power management, analog, logic, sensors, etc.).

FAN4800AUM is a high-voltage, fixed-frequency current-mode control IC for offline SMPS. Typical application areas include:
- Off-line AC-DC adapters and power supplies (flyback/buck-boost)
- LED lighting drivers (constant-current, dimmable)
- USB chargers and portable-power adapters
- Battery charging circuits and small DC-DC converters
- General high-voltage switching regulator designs in low-to-medium power applications

FAN4800AUM is in an 8-pin MSOP (MSOP-8) package.