Datasheet

LM2599
www.ti.com SNVS123C –APRIL 1998–REVISED APRIL 2013
Test Circuit and Layout Guidelines
Fixed Output Voltage Versions
Component Values shown are for V
IN
= 15V,
V
OUT
= 5V, I
LOAD
= 3A.
C
IN
— 470 μF, 50V, Aluminum Electrolytic Nichicon “PL Series”
C
OUT
— 220 μF, 25V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 5A, 40V Schottky Rectifier, 1N5825
L1 — 68 μH, L38
Typical Values
C
SS
— 0.1 μF
C
DELAY
— 0.1 μF
R
Pull Up
— 4.7k
Adjustable Output Voltage Versions
where V
REF
= 1.23V
Select R
1
to be approximately 1 kΩ, use a 1% resistor for best stability.
Component Values shown are for V
IN
= 20V,
V
OUT
= 10V, I
LOAD
= 3A.
C
IN
: — 470 μF, 35V, Aluminum Electrolytic Nichicon “PL Series”
C
OUT
: — 220 μF, 35V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 5A, 30V Schottky Rectifier, 1N5824
L1 — 68 μH, L38
R
1
— 1 kΩ, 1%
R
2
— 7.15k, 1%
C
FF
— 3.3 nF, See Application Information Section
R
FF
— 3 kΩ, See Application Information Section
Typical Values
C
SS
—0.1 μF
C
DELAY
—0.1 μF
R
PULL UP
—4.7k
Figure 24. Standard Test Circuits and Layout Guides
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