KASxO2xx-SERIES Fairchild Power Switch (FPS)

Category: Electronics, Fairchild Semiconductor, Other Semiconductors

Overview

The KASxO2xx-SERIES datasheet presents information on the Fairchild Power Switch (FPS) product family, which is particularly tailored for off-line Switched Mode Power Supplies (SMPS) with reduced external components.

Features

The FPS devices feature a precision fixed operating frequency (100/67/50kHz) and a low start-up current (typically 100µA). They are equipped with comprehensive protection and control functions, such as:

– Pulse by pulse current limiting

– Overload protection

– Overvoltage protection (minimum 25V)

– Internal thermal shutdown function

– Under voltage lockout

– Internal high voltage SenseFET

– Auto-restart mode.

Description

FPS components consist of a high-voltage power SenseFET and a current mode PWM (Pulse Width Modulation) controller IC. The integrated PWM controller comes with several features such as an oscillator, under-voltage lockout, leading edge blanking, gate drive optimization, thermal shut down, over-voltage protection, and loop compensation as well as fault protection circuitry. The integrated approach offered by the FPS implies an improvement over discrete MOSFET and controllers or RCC switching converter solutions.

Utilizing the FPS can result in a decrease in overall component count, and consequently in the size, weight, and cost of the design. Additionally, it can enhance efficiency, productivity, and system reliability. The FPS devices are suitable for use in both flyback and forward converter designs.

Package Options

The datasheet specifies the package options for the FPS, which include:

– TO-220F-4L

– 8-DIP

– TO-220-5L.

Pin Configuration

The pin configuration describes distinct functions such as:

– Drain

– Ground (GND)

– Supply Voltage (Vcc)

– Feedback (FB)

– Soft Start (SIS), with the fifth pin being Non-Connected (NC) for some package types.

Internal Block Diagram

An internal block diagram is provided which shows the internal architecture of the device clarifying the interconnections between various blocks including the Soft Start, OSC (Oscillator), thermal shutdown (SID), Over Voltage SID, along with other internal components. These help in understanding the integrated functions of the FPS and offer a quick reference to how the device operates.