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LM2590HV Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2590HV
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)

LM2590HV Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Test Circuit and Layout Guidelines
Fixed Output Voltage Versions
10134724
Component Values shown are for VIN = 15V,
VOUT = 5V, ILOAD = 1A.
CIN
470 µF, 50V, Aluminum Electrolytic Nichicon “PM Series”
COUT
220 µF, 25V Aluminum Electrolytic, Nichicon “PM Series”
D1
2A, 60V Schottky Rectifier, 21DQ06 (International Rectifier)
L1
68 µH, See Inductor Selection Procedure
Adjustable Output Voltage Versions
10134725
Select R1 to be approximately 1 kΩ, use a 1% resistor for best stability.
Component Values shown are for VIN = 20V,
VOUT = 10V, ILOAD = 1A.
CIN:
— 470 µF, 35V, Aluminum Electrolytic Nichicon “PM Series”
COUT:
— 220 µF, 35V Aluminum Electrolytic, Nichicon “PM Series”
D1 — 2A, 60V Schottky Rectifier, 21DQ06 (International Rectifier)
L1 — 100 µH, See Inductor Selection Procedure
R1 —1 kΩ,1%
R2 — 7.15k, 1%
CFF — 3.3 nF
Typical Values
CSS — 0.1 µF
CDELAY — 0.1 µF
RPULL UP — 4.7k (use 22k if VOUT is ≥ 45V)
† Resistive divider is required to aviod exceeding maximum rating of 45V/3mA on/into flag pin.
†† Small signal Schottky diode to prevent damage to feedback pin by negative spike when output is shorted (CFF not being able to discharge immediately will
drag feedback pin below ground). Required if VIN > 40V
FIGURE 1. Standard Test Circuits and Layout Guides
www.national.com
8


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