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TPS62172QDSGTQ1 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS62172QDSGTQ1
Description  3-V to17-V 0.5-A Step-Down Converters with DCS-Control
Download  33 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TPS62170-Q1, TPS62171-Q1, TPS62172-Q1
SLVSCK7A – DECEMBER 2014 – REVISED SEPTEMBER 2016
www.ti.com
Product Folder Links: TPS62170-Q1 TPS62171-Q1 TPS62172-Q1
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Device Functional Modes (continued)
The output current of the device is limited by the current limit (see Electrical Characteristics). Due to internal
propagation delay, the actual current can exceed the static current limit during that time. The dynamic current
limit can be calculated as follows:
space
(4)
where
ILIMF is the static current limit, specified in the electrical characteristic table,
L is the inductor value,
VL is the voltage across the inductor and
tPD is the internal propagation delay.
space
The dynamic high side switch peak current can be calculated as follows:
space
(5)
space
Care on the current limit has to be taken if the input voltage is high and very small inductances are used.
7.4.5 Operation Above TJ = 125°C
The operating junction temperature of the device is specified up to 125°C. In power supply circuits, the self
heating effect causes, that the junction temperature, TJ, is even higher than the ambient temperature TA.
Depending on TA and the load current, the maximum operating temperature TJ can be exceeded. However, the
electrical characteristics are specified up to a TJ of 125°C only. The device operates as long as thermal
shutdown threshold is not triggered.


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