VN751S
9
Active VDS clamp
Active VDS clamp
The active clamp is also known as the fast demagnetization of inductive loads or fast current
decay. When a high-side driver turns off an inductance, an undervoltage is detected on the
output.
The OUT pin is pulled down to Vdemag. The conduction state is modulated by internal
circuitry in order to keep the OUT pin voltage at about Vdemag until the load energy has been
dissipated. The energy is dissipated both in the IC internal switch and in load resistance.
Figure 10. Active clamp equivalent principle schematic
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DocID12320 Rev 9
15/22
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