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LM2595S-3.3 Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza LM2595S-3.3
Descripción Electrónicos  SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM2595S-3.3 Datasheet(HTML) 3 Page - Texas Instruments

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3
LM2595
www.ti.com
SNVS122C – MAY 1999 – REVISED MAY 2016
Product Folder Links: LM2595
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
5 Description (continued)
A standard series of inductors are available from several different manufacturers optimized for use with the
LM2595 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a ±4% tolerance on output voltage under specified input voltage and output load
conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-μA stand-
by current. Self protection features include a two stage frequency reducing current limit for the output switch and
an overtemperature shutdown for complete protection under fault conditions.
6 Pin Configuration and Functions
NDH Package
5–Pin TO-220
Top View
KTT Package
5-Pin TO-263
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NO.
NAME
1
Output
O
Internal switch. The voltage at this pin switches between (+VIN − VSAT) and approximately –0.5 V,
with a duty cycle of approximately VOUT/VIN. To minimize coupling to sensitive circuitry, the PCB
copper area connected to this pin must be kept to a minimum.
2
+VIN
I
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must
be present at this pin to minimize voltage transients and to supply the switching currents needed by
the regulator.
3
Ground
Circuit ground.
4
Feedback
I
Senses the regulated output voltage to complete the feedback loop.
5
ON/OFF
I
Allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total
input supply current to approximately 85 μA. Pulling this pin below a threshold voltage of
approximately 1.3 V turns the regulator on, and pulling this pin above 1.3 V (up to a maximum of
25 V) shuts the regulator down. If this shutdown feature is not needed, the ON/OFF pin can be wired
to the ground pin or it can be left open, in either case the regulator is in the ON condition.


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