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TLV70225 Datasheet(PDF) 11 Page - Texas Instruments

Part # TLV70225
Description  Thermal Shutdown and Overcurrent Protection
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV70225 Datasheet(HTML) 11 Page - Texas Instruments

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background image
t
=
(120
R )
(120+R )
L
L
·
·
C
OUT
Thermal
Shutdown
Current
Limit
UVLO
Bandgap
IN
EN
OUT
LOGIC
GND
TLV702xxPSeries
120W
TLV702
www.ti.com
SLVSAG6C – SEPTEMBER 2010 – REVISED MARCH 2015
Functional Block Diagrams (continued)
Figure 24. TLV702P Block Diagram
7.3 Feature Description
7.3.1 Internal Current Limit
The TLV702 internal current limit helps to protect the regulator during fault conditions. During current limit, the
output sources a fixed amount of current that is largely independent of the output voltage. In such a case, the
output voltage is not regulated, and is VOUT = ICL × RLOAD. The PMOS pass transistor dissipates (VIN – VOUT) ×
ICL until thermal shutdown is triggered and the device turns off. As the device cools, it is turned on by the internal
thermal shutdown circuit. If the fault condition continues, the device cycles between current limit and thermal
shutdown. See Thermal Consideration for more details.
The PMOS pass element in the TLV702 has a built-in body diode that conducts current when the voltage at OUT
exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated,
external limiting to 5% of the rated output current is recommended.
7.3.2 Shutdown
The enable pin (EN) is active high. The device is enabled when voltage at EN pin goes above 0.9 V. The device
is turned off when the EN pin is held at less than 0.4 V. When shutdown capability is not required, EN can be
connected to the IN pin.
The TLV702P version has internal active pulldown circuitry that discharges the output with a time constant of:
where:
RL = Load resistance
COUT = Output capacitor
(1)
Copyright © 2010–2015, Texas Instruments Incorporated
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