Datasheet

ENA
START ENA
ENA
1
V
R2
V V
V
I
R1 R3
=
-
+ -
START STOP
OUT
HYS
V V
R1
V
I
R3
-
=
+
EN
Ihys
VIN
+
-
TPS54160A
R1
R2
VOUT
R3
I1
0.9 Am
2.9 Am
1.25 V
ENA
START ENA
1
V
R2
V V
I
R1
=
-
+
START STOP
HYS
V V
R1
I
-
=
EN
VIN
+
-
TPS54160A
R1
R2
Ihys
I1
0.9 Am
1.25 V
2.9 Am
TPS54160 , TPS54160A
SLVSB56C –MAY 2012–REVISED FEBRUARY 2014 www.ti.com
Feature Description (continued)
Figure 29. Adjustable Undervoltage Lockout (UVLO)
(2)
(3)
Another technique to add input voltage hysteresis is shown in Figure 30. This method may be used, if the
resistance values are high from the previous method and a wider voltage hysteresis is needed. The resistor R3
sources additional hysteresis current into the EN pin.
Figure 30. Adding Additional Hysteresis
(4)
(5)
Do not place a low-impedance voltage source with greater than 5 V directly on the EN pin. Do not place a
capacitor directly on the EN pin if V
EN
> 5 V when using a voltage divider to adjust the start and stop voltage.
The node voltage, (see Figure 31) must remain equal to or less than 5.8 V. The zener diode can sink up to 100
µA. The EN pin voltage can be greater than 5 V if the V
IN
voltage source has a high impedance and does not
source more than 100 µA into the EN pin.
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