PTB78520W Datasheet, PDF (11/15 Pages) Texas Instruments – 20-A, 18–60-V Input Auto-Track Compatible Isolated DC/DC Converter

Application Notes
PTB78520W
Not Recommended for New Designs
Stand-Alone Operation
The combination of a wide-input and wide-output volt-
age range makes the PTB78520W an attractive product
as a stand-alone DC/DC converter. In these applications
the PTB78520W is not required to power up, or sequence
with, any non-isolated POL modules. The output voltage
can be adjusted to any value over the range, 1.8 V to 3.6 V,
and the Auto-Track features simply disregarded.
Figure 2-4 shows the the recommended configuration of
the PTB78520W when it is used as a stand-alone con-
verter. As a sequenced output voltage is not required, the
main output, ‘V_O Bus’, is used to supply all the load cur-
rent. The ‘Track’ pin, and ‘V_O Seq’ output are simply left
open circuit. The ‘(+)Sense’ pin can also be connected to
the ‘V_O Bus’ output for improved load regulation.
When the PTB78520W is operated in this mode, the
output from ‘V_O Bus’ rises promptly upon power up. The
converter also exhibits slightly less power dissipation and
a corresponding improvment in operating efficiency.
Figure 2-4; PTB78520W Stand-Alone Configuration
4
Track
PTB78520W
8
+Sense
10
1
VO Seq
+VI
+VI
9
VO Bus
2
VO Enable
7
VO Adjust
RSET
L
C1
O
100 µF A
D
5
VO COM
3
6
–VI
–VI
–Sense
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