PTH12030W/L
www.ti.com
SLTS211F–MAY 2003–REVISED FEBRUARY 2007
2
U1
VI
Track
VI = 12 V
Vo1 = 3.3 V
3
6
VO
PTH12050W
Inhibit
GND
1
Adjust
4
5
+
+
CI1
CO1
RSET1
2.0 kΩ
8
VCC
U3
7
2
1
3
SENSE
RESIN
5
6
RESET
#
50 Ω
RTRK
TL7712A
REF
10
9
8
5
U2
VI
Up Dn
Track
Sense
RESET
CT
Vo2 = 1.8 V
2
6
GND
VO
PTH12060W
4
CREF
RRST
CT
10 kΩ
0.1 µF
3.3 µF
Inhibit
GND
Adjust
3
1
4
7
+
+
# R
= 100 Ω / N
CI2
CO2
TRK
RSET2
N = Number of Track pins connected together
11.5 kΩ
Figure 14. Sequenced Power Up and Power Down Using Auto-Track
V
TRK
(1 V/div)
V
TRK
(1 V/div)
V 1 (1 V/div)
0
V 1 (1 V/div)
0
V 2 (1 V/div)
0
V 2 (1 V/div)
0
t − Time − 400 µs/div
t − Time − 20 ms/div
Figure 15. Simultaneous Power Up
with Auto-Track Control
Figure 16. Simultaneous Power Down
with Auto-Track Control
16
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