JAJSMH6F July 2021 – August 2024 TPS7H5001-SP , TPS7H5002-SP , TPS7H5003-SP , TPS7H5004-SP
PRODUCTION DATA
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The soft-start circuit increases the output voltage of the converter gradually until the steady-state programmed output is reached. During soft start, the error amplifier uses the voltage on the soft-start pin as its reference until the SS pin voltage rises above VREF. Once the voltage at SS pin is above VREF, the soft-start period is complete. Note that the voltage at SS pin will continue to rise and once it reaches 1 V, the synchronous rectifier outputs of the controller will become active.
A capacitor between the SS pin and AVSS controls the soft-start time of the PWM controller. The following equation can be used to select the capacitor for the desired soft-start time:
where: