PTB78560A_15 Datasheet, PDF (21/27 Pages) Texas Instruments – 30-W, 24-V/48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK™ SEQUENCING

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PTB78560A, PTB78560B
PTB78560C
SLTS249 – JUNE 2005
V_OBus (1 V/div)
V_(POL)1 (1 V/div)
V_(POL)2 (1 V/div)
t_d = 20 ms
t − 10 ms/div
Figure 29. Power-Up Waveform
Track ⁵
U1
PTB78560A
+V_I
1 _+VI
+Sense ⁹
C_I
100 µF
2 _PEN
3 _NEN
V_O Bus ¹⁰
V_O Adjust 8
V_O COM ⁶
−V_I
4 _−VI
7
−Sense
C2
220 µF
R1
13.7 kΩ
2
Track
3
V_I
U2
6
PTH04000W VO
Inhibit GND Adjust
4
15
C3
47 µF
R2
475 Ω
3 _VI
2
Track
U3
6
PTH04000W ^VO
Inhibit GND Adjust
4
5
C5
47 µF
15
R3
11.5 kΩ
Figure 30. Power-Up Sequencing With Nonisolated POL Modules
V_O Bus
(5 V)
V_POL1
(3.3 V)
C4
47 µF
V_POL2
(1.5 V)
C6
47 µF
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