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LM2598T-12 Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2598T-12
Description  SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2598T-12 Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Test Circuit and Layout Guidelines
Fixed Output Voltage Versions
DS012593-23
Component Values shown are for VIN = 15V, VOUT =5V, ILOAD = 1A.
120 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”
120 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”
3A, 40V Schottky Rectifier, 1N5822
68 µH, L30
Typical Values
*CSS:
— 0.1 µF
CDELAY:
— 0.1 µF
RPull Up:
— 4.7k
Adjustable Output Voltage Versions
DS012593-24
where VREF = 1.23V
Select R1 to be approximately 1kΩ, use a 1% resistor for best stability.
Component Values shown are for VIN = 20V,
VOUT = 10V, ILOAD = 1A.
CIN
— 120 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
COUT
— 120 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”
D1
— 3A, 40V Schottky Rectifier, 1N5822
L1
— 100 µH, L29
R1
—1 k
Ω,1%
R2
— 7.15k, 1%
CFF
— 3.3 nF, See Application Information Section
RFF
—3 k
Ω, See Application Information Section
Typical Values
CSS — 0.1 µF
CDELAY — 0.1 µF
RPULL UP — 4.7k
FIGURE 1. Standard Test Circuits and Layout Guides
www.national.com
9


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