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PTB78560A_15 Datasheet, PDF (22/27 Pages) Texas Instruments – 30-W, 24-V/48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK™ SEQUENCING
PTB78560A, PTB78560B
PTB78560C
SLTS249 – JUNE 2005
www.ti.com
Stand-Alone Operation
The wide output voltage adjust range makes either model of the PTB78560 series of converters an attractive
product as a stand-alone dc/dc converter. In these applications, it is not required to power up or sequence with
any nonisolated POL modules. The output voltage can be adjusted to any value within the applicable adjust
range. The Auto-Track features are simply not used.
Figure 31 shows the recommended configuration when these converters are used as a stand-alone regulator.
The main output (VO Bus) can be used to supply the load directly. Both the Track pin and the VO Seq output
(PTB78560B) are simply left open circuit. The +Sense pin should be connected to the VO Bus output for
improved load regulation.
When the converter is operated in this mode, the output from VO Bus rises promptly on power up.
PTB78560x
5
Track
+Sense 9
+VI
1
VO Seq 11
+VI
VO Bus 10
2
PEN
3
NEN
8
VO Adjust
RSET
L
C1
O
220 µF A
D
VO COM 6
4 −VI
7
−Sense
−VI
Figure 31. Stand-Alone Configuration
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