5L0380R – Power Management IC ( KA5L0380R )

Part Number: 5L0380R, KA5L0380R

Functions: Power Management IC

Package: SIP 4 Pin Type

Manufacturer: Fairchild Semiconductor


5l0380r smps circuit


The 5L0380R is Power Switch(FPS).

The Fairchild Power Switch(FPS) product family is specially designed for an off-line SMPS with minimal external components. The Fairchild Power Switch(FPS) consists of a high voltage power SenseFET and a current mode PWM IC. Included PWM controller integrates the fixed frequency oscillator, the under voltage lock-out, the leading edge blanking, the optimized gate turn-on/turn-off driver, the thermal shutdown protection, the over voltage protection, and the temperature compensated precision current sources for the loop compensation and the fault protection circuitry.


• Precision Fixed Operating Frequency (100/67/50kHz)
• Low Start-up Current(Typ. 100uA)
• Pulse by Pulse Current Limiting
• Over Current Protection
• Over Voltage Protection (Min. 25V)
• Internal Thermal Shutdown Function
• Under Voltage Lockout
• Internal High Voltage Sense FET
• Auto-Restart Mode

1. Power MOSFET: The integrated power MOSFET allows for efficient switching and control of power in the application.

2. PWM Controller: The built-in Pulse Width Modulation (PWM) controller provides regulation and control over the power supply output.

3. Protections: The IC includes various protection features like overvoltage protection, overload protection, and over-temperature protection to ensure safe and reliable operation.

4. Energy Efficiency: The KA5L0380R is designed to deliver high energy efficiency and minimize power consumption, making it suitable for applications that require energy-saving capabilities.

Pinouts and schematic:

5L0380R pinout KA5L0380R



• SMPS for Printer, Facsimile & Scanner
• Adaptor for Camcorder


5L0380R datasheet pdf

5L0380R Datasheet File

Information related to components

5L0380R - - Fairchild


Fairchild Semiconductor