SNVS107C – JUNE 1999 – REVISED APRIL 2013
TEST CIRCUIT AND LAYOUT GUIDELINES
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the
length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as
indicated) or ground plane construction should be used for best results. When using the Adjustable version,
physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short.
C
IN
— 100
μF,
75V, Aluminum Electrolytic
C
OUT
— 1000
μF,
25V, Aluminum Electrolytic
D
1
— Schottky, MBR360
L
1
— 100
μH,
Pulse Eng. PE-92108
R
1
— 2k, 0.1%
R
2
— 6.12k, 0.1%
Figure 21. Fixed Output Voltage Versions
where
V
REF
= 1.23V, R1 between 1k and 5k
Figure 22. Adjustable Output Voltage Version
Copyright © 1999–2013, Texas Instruments Incorporated
11
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