5L0365R PDF Datasheet – Fairchild Power Switch

This post describes for the Power Switch.

The function of this semiconductor is Fairchild Power Switch(FPS).

The package is TO-220F-4L Type

The manufacturer of this parts is Fairchild Semiconductor.

Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.

See the preview image and the 5L0365R Datasheet PDF file for more information.


5L0365R schematic


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.

5L0365R is a type of power switch that is designed for use in power supplies and other applications that require high efficiency and low power consumption. It is a type of switching regulator that uses a pulse width modulation (PWM) technique to regulate the output voltage.

The Green Mode Fairchild Power Switch is named after its environmentally friendly design, which minimizes power loss and reduces energy consumption. It is designed to operate in a low-power standby mode when there is no load demand, which helps to conserve energy and reduce standby power consumption.

1 page
5L0365R pdf datasheet


• 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




• SMPS for Printer, Facsimile & Scanner

• Adaptor for Camcorder


Other data sheets are available within the file:

KA5H0365R, KA5M0365R, KA5L0365R, KA5H0380R, KA5M0380R, KA5L0380R, 5LO365R

5L0365R PDF Datasheet

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LD7660J PDF Datasheet – Low Power Off-line Switcher

Part Number: LD7660J, LD7660JGN

Function: Low Power Off-line Switcher

An off-line switcher, also known as an offline switch-mode power supply (SMPS) controller or off-line flyback controller, is an integrated circuit (IC) or semiconductor device used in power supply designs to convert high-voltage AC (alternating current) mains voltage to a lower DC (direct current) voltage for various electronic devices. These controllers are specifically designed for offline power supplies, which operate directly from the mains power source, typically at voltages such as 100V to 240V AC.

Package: DIP 8 Pin Type

Manufacturer: Leadtrend


LD7660J pdf pinout


The LD7660J integrated a 600V power MOSFET and a current mode PWM controller in a DIP-8 package. It’s operating at fixed frequency of 65 kHz. It provides important functions needed for a low output power applications such as leading-edge blanking of the current sensing, internal slope compensation, and green-mode power-saving operation under light load or no load condition.

This highly integrated device provides the users a high efficiency, low external component counts, and low cost solution for low power adaptor or charger applications. The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7660J is operating under light load or no load condition.


1. Built-in 600V/1A Power MOSFET

2. Secondary-side/Primary-side feedback control

3. Switching Frequency at 65KHz

4. Fixed Internal Frequency Trembling

5. Built-in Load Regulation Compensation

6. Built-in Slope Compensation with 75% max duty-cycle

7. Low Startup Current (<20μA)

8. Current Mode Control with Cycle-by-Cycle Current Limit

9. Non-audible-noise Green Mode Control

LD7660J datasheet


1. AC to DC Conversion: Off-line switchers take the high-voltage AC input from the mains and convert it into a lower DC voltage suitable for powering electronic devices. This process involves rectification, filtering, and voltage regulation.

2. Switching Operation: Off-line switchers use high-frequency switching to convert the AC input voltage into a high-frequency AC signal. This allows for smaller and more efficient transformers and reduces the size and weight of the power supply.



1. Switching AC/DC Adaptor

2. LCD TV or PC Standby Power


LD7660J PDF Datasheet