JAJSLU8C February 2019 – April 2021 TPS51396A
PRODUCTION DATA
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The TPS51396A has an internal 1.3-ms soft start, and also an external SS pin is provided for setting higher soft-start time if needed. When the EN pin becomes high, the soft-start function begins ramping up the reference voltage to the PWM comparator.
If the application needs a larger soft start time, it can be set by connecting a capacitor on SS pin. When the EN pin becomes high, the soft-start charge current (ISS) begins charging the external capacitor (CSS) connected between SS and AGND. The devices tracks the lower of the internal soft-start voltage or the external soft-start voltage as the reference. The equation for the soft-start time (TSS) is shown in Equation 2:
where