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In the attached file soft start time is varied when we change the input voltage. Could you please let me know this reason? Also , please let me know the culculation of tss(soft start time).
In attached file page 4, Vout was increased as step by step at start-up. I thought that this cause is current limit. However Isen peak voltage is about 70mV.
Hi, In your 5VIN plot it looks like there is a 4 or 5ms delay from VIN to VOUT starting to come up, this delay is less than 2ms when VIN is at 8V, If you refer to UVLO section on page 13 of the datasheet, R7 and R8 sets up the UVLO rising and enable values, for example if UVLO is ~4V and VIN is 5V, this may account for this inital delay before VIN starts to rise.
Also looks like the start up time is internally fixed at 15ms.
Yes this is expected behaviour, the soft start feature allows the output to gradually reach staedy-state operation, thus reducing inrush current.The internal soft start brings the output up in about 15ms.
