Datasheet

V
OUT
(500 mV/DIV)
R
LOAD
= 1.2Ö
R
FB1
= 0Ö
V
SS/TRK
(500 mV/DIV)
TIME (4 ms/DIV)
V
EN
(1V/DIV)
V
OUT
(500 mV/DIV)
R
LOAD
= 1.2Ö
TIME (200 és/DIV)
V
OUT
(500 mV/DIV)
R
LOAD
= 1.2Ö
V
EN
(5V/DIV)
C
SS/TRK
= None
C
SS/TRK
= 33 nF
C
SS/TRK
= 68 nF
TIME (2 ms/DIV)
V
OUT
(50 mV/DIV)
V
IN
(1V/DIV)
TIME (100 és/DIV)
V
IN
(3V to 5V)
LM20146
SNVS563C –FEBRUARY 2008–REVISED APRIL 2013 www.ti.com
Typical Performance Characteristics (continued)
Unless otherwise specified: C
IN
= C
OUT
= 100µF, L = 1.0µH (TDK SPM6530T-1R0M120), V
IN
= 5V, V
OUT
= 1.2V, R
LOAD
=
1.2Ω, f
SW
= 500 kHz, T
A
= 25°C for efficiency curves, loop gain plots and waveforms, and T
J
= 25°C for all others.
Line Transient Response Start-Up (Soft-Start)
Figure 20. Figure 21.
Start-Up (Tracking) Power Down
Figure 22. Figure 23.
Short Circuit Input Current P
GOOD
vs. vs.
V
IN
I
PGOOD
Figure 24. Figure 25.
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