LM2577T-ADJ 3 Pin Transistor SIMPLE SWITCHER-R Step-Up Voltage Regulator

LM1577/LM2577 Series SIMPLE SWITCHER® Step-Up Voltage Regulator

Features

♦ Requires few external components

♦ NPN output switches 3.0A, can stand off 65V

♦ Wide input voltage range: 3.5V to 40V

♦ Current-mode operation for improved transient response, line regulation, and current limit

♦ 52 kHz internal oscillator

♦ Soft-start function reduces in-rush current during start-up ♦ Output switch protected by current limit, under-voltage lockout, and thermal shutdown

Typical Applications

♦ Simple boost regulator

♦ Flyback and forward regulators

♦ Multiple-output regulator

General Description

The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators.

Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Typical Application

CHONGMING GROUP (HK) INT'L CO., LTD. located in Hong Kong and Shenzhen. We are an independent Distributor of Electronic Components,established in 2008. AS a growing fast company, CM GROUP is renowned for its world-class efficiency, excellent services, and extraordinary ability to supply electronic components that are hard to find and even obsolete. We have taken pride in our innovation, reliability and service, especially in the semiconductor marketplace.
Our distribution brands include XILINX，ALTERA，ATMEL, INFINEON, ST,SAMSUNG，TEXAS INSTRUMENTS，ON，TOSHIBA，，MICROCHIP，CYPRESS，FREESCALE，etc. We distributes over 200,000 products ranging from semiconductors to resistors, capacitors, diodes, inductors, connectors, transistors, sensors and so on.
Our mission is to meet and exceed all the expecations of what we supply to customers.