TLE956x family: What is the purpose of the separate VS/VSINT supply pins?

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forix
Employee
Employee
25 replies posted 10 replies posted 5 replies posted
VSINT is the supply for the voltage regulator VCC1
VS is the supply for the charge pump and for the gate drivers.
Having two separate inputs for VS and VSINT enables to buffer more easily VSINT, in order to maintain VCC1 in case of a drop of the battery voltage.

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Indeed, the possible high load current drawn by the half-bridges does not discharge Cin2, which is the buffer capacitor for VSINT, thanks to the decoupling diode Drev1.
Note: Drev1 is also used as reverse battery protection for VSINT.
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