Datasheet

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Stand-Alone Operation
1
3
4
5
9
10
11
8
7
6
L
O
A
D
Track
−Sense
+V
I
−V
I
NEN
PTB78560x
PEN
2
V
O
Seq
+Sense
V
O
Bus
V
O
Adjust
V
O
COM
−V
I
+V
I
R
SET
C1
220 µF
PTB78560A , PTB78560B
PTB78560C
SLTS249 – JUNE 2005
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 (V
O
Bus) can be used to supply the load directly. Both the Track pin and the V
O
Seq output
(PTB78560B) are simply left open circuit. The +Sense pin should be connected to the V
O
Bus output for
improved load regulation.
When the converter is operated in this mode, the output from V
O
Bus rises promptly on power up.
Figure 31. Stand-Alone Configuration
22
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