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| TPS54260-Q1_15 Datasheet, PDF (15/52 Pages) Texas Instruments – TPS54260-Q1 3.5-V to 60-V Step-Down Converter With Eco-mode™ | |||
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Feature Description (continued)
TPS54260-Q1
SLVSAH8F â DECEMBER 2010 â REVISED AUGUST 2015
TPS54260-Q1
VIN
R1
I1
0.9 mA
Ihys
2.9 mA
R2
EN
+
1.25 V -
Figure 27. Adjustable UVLO
R1 =
VSTART - VSTOP
IHYS
(2)
R2 =
VENA
VSTART - VENA
R1
+ I1
(3)
Another technique to add input voltage hysteresis is shown in Figure 28. 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.
TPS54260-Q1
VIN
R1
I1
0.9 mA
Ihys
2.9 mA
R2
EN
+
1.25 V -
VOUT
R3
Figure 28. Adding Additional Hysteresis
R1 =
VSTART - VSTOP
IHYS
+
VOUT
R3
(4)
R2 =
VENA
VSTART - VENA
R1
+ I1 -
VENA
R3
(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 VEN > 5 V when using a voltage divider to adjust the start and stop voltage.
The node voltage, (see Figure 29) 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 VIN voltage source has a high impedance and does not
source more than 100 µA into the EN pin.
Copyright © 2010â2015, Texas Instruments Incorporated
Product Folder Links: TPS54260-Q1
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