LM2577T-ADJ 3 Pin Transistor SIMPLE SWITCHER-R Step-Up Voltage Regulator
multi emitter transistor
,silicon power transistors
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
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