PTB48560A Datasheet, PDF (22/28 Pages) Texas Instruments – 30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING

PTB48560A, PTB48560B
PTB48560C
SLTS236A – MARCH 2005 – REVISED OCTOBER 2005
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Stand-Alone Operation
The wide output voltage adjust range makes either model of the PTB48560 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 23 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
(PTB48560B) 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.
5
Track
PTB48560x
9
+Sense
11
+V_I
1
+V_I
V_OSeq
10
V_OBus
2
PEN
3 _NEN
8
V_OAdjust
R_Set
L
C1
O
220 mF ^A
D
6
V_OCOM
−V_I
4 _−VI
7
−Sense
Figure 23. Stand-Alone Configuration
22