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LM2577

Features: Requires few external componentsNPN output switches 3.0A, can stand off 65VWide input voltage range: 3.5V to 40VCurrent-mode operation for improved transient response, line regulation, and current limit52 kHz internal oscillatorSoft-start function reduces in-rush current during start-upO...

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SeekIC No. : 004394893 Detail

LM2577: Features: Requires few external componentsNPN output switches 3.0A, can stand off 65VWide input voltage range: 3.5V to 40VCurrent-mode operation for improved transient response, line regulation, and...

LM2577 Data Sheet

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Part Number:
LM2577
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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




Application

Simple boost regulator
Flyback and forward regulators
Multiple-output regulator




Pinout

Connection Diagram




Specifications

Supply Voltage 45V
Output Switch Voltage65V
Output Switch Current (Note 2) 6.0A
Power Dissipation Internally Limited
Storage Temperature Range −65˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.) 260˚C
Maximum Junction Temperature150˚C
Minimum ESD Rating
(C = 100 pF, R = 1.5 kΩ)2kV

Output Range 15V, 1.23V min, 12V
Switch Current 3 Amp
Input Min Voltage 3.5 Volt
Input Max Voltage 40 Volt
Feedback Voltage 1.23, 12, 15 Volt
Frequency Max 52 kHz
Efficiency (peak) 80 %
Sync Pin No
Adj Switch Frequency No
Frequency Min 52 kHz
On/Off Pin No
Error Flag No
SoftStart Yes
Special Features SIMPLE SWITCHER regulator
Topology Boost, Flyback
Step-Up Yes
Inverting No
Flyback Yes
RegType Switching Regulator
Adjustable Output No, Yes
Temperature Min -40 deg C
Temperature Max 125 deg C
Regulator Family SIMPLE SWITCHER
View Using Catalog





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 LM2577 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.






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