Our advantages 

Chinese manufacturing processes have undergone years of iteration, resulting in mature and reliable technologies. Many international corporations opt for production outsourcing in China. As an electronic components manufacturer in China, our products can fully replace those of major international brands in 99% of applications without the need for testing verification. Our products boast high consistency in quality, reasonable pricing, ample inventory, flexible supply, short lead times, and professional after-sales service. 

Description

The LM2577S/T-ADJ is a monolithic integrated circuit that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. 

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.

The LM2577S is available in TO263-5L package. 

The LM2577T is available in TO220-5L package.

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

Applications

● Simple boost regulator
● Flyback and forward regulators
● Multiple-output regulator