KASxO2xx-SERIES Fairchild Power Switch(FPS)

Category: Electronics, Fairchild Semiconductor, Other Semiconductors

Overview

The KASxO2xx-SERIES, consisting of multiple models such as KASHO265RC, KASMO265R, KASLO265R, KASHO2659RN/KASMO2659RN, and KASHO28OR/KASMO28OR, are part of the Fairchild Power Switch (FPS) product family by Fairchild Semiconductor. These switches are optimized for use in off-line SMPS (Switched-Mode Power Supply) applications and aim to reduce the number of external components required in the design.

Key Features

Precision Fixed Operating Frequency: Ranges from 100 to 67 to 50 kHz.
Low Start-Up Current: The typical start-up current is as low as 100µA.
Efficient Current Regulations: This includes pulse-by-pulse current limiting and an integrated high voltage SenseFET.
Protection Mechanisms: The series offers multiple protection features against overload, overvoltage (min. 25V), and thermal overload, with an internal thermal shutdown function.
Under Voltage Lockout (UVLO): Ensures the device only operates at adequate power levels.
Auto-Restart Mode: This mode is triggered during fault conditions to attempt a safe recovery.

Advantages and Efficiency

Due to the integration of a current mode PWM IC and power SenseFET, the FPS provides an efficient solution that not only simplifies the design by reducing the total component count but also improves the end product by enhancing performance in terms of size, weight, efficiency, and reliability. The FPS can serve as a fundamental platform for designing cost-effective power supply solutions, be it flyback or forward converters.

Product Variants

Variants within this series come in different package types, including TO-220F-4L, 8-DIP, and TO-220-5L. Each variant is tailored to fit specific use cases while maintaining the core advantages of the FPS series such as precise operating frequencies and robust protection features.

Internal Block Diagram and Pin Configuration

The internal block diagram is provided, elucidating the circuitry composed of Vcc, an internal bias, DRAIN, Vref, a good logic indicator, Soft Start and OSC for the oscillator, FB for feedback, overvoltage SID (shutdown), power-on reset, thermal SID, and GND. Pin configurations for each model are described, varying between GND, Drain, Vcc, FB, and NC/SIS, depending on the specific model variant.

Document Revision

The datasheet is marked as revision 1.0.4, updated in 2003 by Fairchild Semiconductor Corporation, indicating the version of the document for the KASxO2xx-SERIES being referenced.