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TLV751 Datenblatt(PDF) 14 Page - Texas Instruments

Teilenummer TLV751
Bauteilbeschribung  TLV751 Dual, 500-mA, High-Accuracy, LDO in a Small-Size Package
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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TLV751 Datenblatt(HTML) 14 Page - Texas Instruments

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VOUT(NOM)
0 V
0 mA
VOUT
VFOLDBACK
ICL
ISC
IRATED
IOUT
Brickwall
Foldback
14
TLV751
SBVS385B – DECEMBER 2019 – REVISED APRIL 2020
www.ti.com
Product Folder Links: TLV751
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Feature Description (continued)
For this device, VFOLDBACK = 0.4 V × VOUT(NOM).
The output voltage is not regulated when the device is in current limit. When a current limit event occurs, the
device begins to heat up because of the increase in power dissipation. When the device is in brickwall current
limit, the pass transistor dissipates power [(VIN – VOUT) × ICL]. When the device output is shorted and the output
is below VFOLDBACK, the pass transistor dissipates power [(VIN – VOUT) × ISC]. If thermal shutdown is triggered, the
device turns off. After the device cools down, the internal thermal shutdown circuit turns the device back on. If
the output current fault condition continues, the device cycles between current limit and thermal shutdown. For
more information on current limits, see the Know Your Limits application report.
Figure 37 shows a diagram of the foldback current limit.
Figure 37. Foldback Current Limit
7.3.4 Thermal Shutdown
Thermal shutdown protection disables the output when the junction temperature rises to approximately 170°C.
Disabling the device eliminates the power dissipated by the device, allowing the device to cool. When the
junction temperature cools to approximately 155°C, the output circuitry is again enabled. Depending on power
dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off.
This cycling limits regulator dissipation, protecting the LDO from damage as a result of overheating.
Activating the thermal shutdown feature usually indicates excessive power dissipation as a result of the product
of the (VIN – VOUT) voltage and the load current. For reliable operation, limit junction temperature to 125°C
maximum. To estimate the margin of safety in a complete design, increase the ambient temperature until the
thermal protection is triggered; use worst-case loads and signal conditions.
The TLV751 internal protection circuitry protects against overload conditions but is not intended to be activated in
normal operation. Continuously running the TLV751 into thermal shutdown degrades device reliability.


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