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TPS62172 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62172 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 33 page ( ) ns L V V I I OUT IN HS LIMF typ peak 30 × - + = _ ) ( PD L LIMF typ peak t L V I I × + = ) ( 10 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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