LM2591HV datasheet(8/20 Pages) NSC

8 / 20 page

Test Circuit and Layout Guidelines

Fixed Output Voltage Versions

10129324

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”

—

2A, 60V Schottky Rectifier, 21DQ06 (International Rectifier)

—

68 µH, See Inductor Selection Procedure

Adjustable Output Voltage Versions

10129325

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)

† 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

LM2591HV Datasheet(PDF) 8 Page - National Semiconductor (TI)

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