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LM2595S-3.3 Datasheet(PDF) 10 Page - Texas Instruments

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Part # LM2595S-3.3
Description  SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM2595S-3.3 Datasheet(HTML) 10 Page - Texas Instruments

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10
LM2595
SNVS122C – MAY 1999 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM2595
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Copyright © 1999–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LM2595 SIMPLE SWITCHER® regulator is an easy-to-use, nonsynchronous step-down DC-DC converter
with a wide input voltage range up to 40 V. The regulator is capable of delivering up to 1-A DC load current with
excellent line and load regulation. These devices are available in fixed output voltages of 3.3-V, 5-V, 12-V, and
an adjustable output version. The family requires few external components, and the pin arrangement was
designed for simple, optimum PCB layout.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Delayed Start-Up
The circuit in Figure 14 uses the ON/OFF pin to provide a time delay between the time the input voltage is
applied and the time the output voltage comes up (only the circuitry pertaining to the delayed start up is shown).
As the input voltage rises, the charging of capacitor C1 pulls the ON/OFF pin high, keeping the regulator off.
Once the input voltage reaches its final value and the capacitor stops charging, the resistor R2 pulls the ON/OFF
pin low, thus allowing the circuit to start switching. Resistor R1 is included to limit the maximum voltage applied to
the ON/OFF pin (maximum of 25 V), reduces power supply noise sensitivity, and also limits the capacitor, C1,
discharge current. When high input ripple voltage exists, avoid long delay time, because this ripple can be
coupled into the ON/OFF pin and cause problems.
This delayed start-up feature is useful in situations where the input power source is limited in the amount of
current it can deliver. It allows the input voltage to rise to a higher voltage before the regulator starts operating.
Buck regulators require less input current at higher input voltages.


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