TI-UC2577-ADJ.pdf
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Simple Step-Up Voltage Regulator
•
Requires Few External Components
•
NPN Output Switches 3.0A, 65V(max)
•
Extended Input Voltage Range: 3.0V to 40V
•
Current Mode Operation for Improved
Transient Response, Line Regulation, and
Current Limiting
•
Soft Start Function Provides Controlled
Startup
•
52kHz Internal Oscillator
•
Output Switch Protected by Current Limit,
Undervoltage Lockout and Thermal
Shutdown
•
Improved Replacement for LM2577-ADJ
Series
The UC2577-ADJ device provides all the active functions neces-
sary to implement step-up (boost), flyback, and forward converter
switching regulators. Requiring only a few components, these sim-
ple regulators efficiently provide up to 60V as a step-up regulator,
and even higher voltages as a flyback or forward converter regula-
tor.
The UC2577-ADJ features a wide input voltage range of 3.0V to
40V and an adjustable output voltage. An on-chip 3.0A NPN switch
is included with undervoltage lockout, thermal protection circuitry,
and current limiting, as well as soft start mode operation to reduce
current during startup. Other features include a 52kHz fixed fre-
quency on-chip oscillator with no external components and current
mode control for better line and load regulation.
A standard series of inductors and capacitors are available from
several manufacturers optimized for use with these regulators and
are listed in this data sheet.
UC2577-ADJ
3/97
FEATURES DESCRIPTION
CONNECTION DIAGRAM
BLOCK DIAGRAM
UDG-94034
•
Simple Boost and Flyback Converters
•
SEPIC Topology Permits Input Voltage to
be Higher or Lower than Output Voltage
•
Transformer Coupled Forward Regulators
•
Multiple Output Designs
TYPICAL APPLICATIONS
5-Pin TO-220 (Top View)
Also available in TO-263 Package.
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