Datasheet

1.25V
20 PA
0.4V
SHUTDOWN
OVP
1.25V
STANDBY
V
PWR
5V
R1
R2
R3
LM5045
STANDBY
UVLO
20 PA
OVP
LM5045
1.25V
20 PA
STANDBY
V
PWR
5V
R1
R2
UVLO
LM5045
1.25V
20 PA
SHUTDOWN
V
PWR
R1
R2
STANDBY
0.4V
LM5045
www.ti.com SNVS699G –FEBRUARY 2011–REVISED MARCH 2013
Figure 23. Basic UVLO Configuration
Figure 24. Basic OVP Configuration
Figure 25. UVLO/OVP Divider
The UVLO and OVP can also be set together using a 3 resistor divider ladder as shown in Figure 25. R
1
is
calculated as explained in the basic UVLO divider selection. Using the same values, as in the above two
examples, for the UVLO and OVP set points, R
1
and R
3
remain the same at 100kΩ and 1.5kΩ. The R
2
is 2.7kΩ
obtained by subtracting R
3
from 4.2kΩ.
Remote configuration of the controller’s operational modes can be accomplished with open drain device(s)
connected to the UVLO pin as shown in Figure 26.
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