Active clamp

IPS161H

18/25

DocID029436 Rev 2

7

Active clamp

Active clamp is also known as fast demagnetization of inductive loads or fast current

decay. When a high-side driver turns off an inductance, an undervoltage is detected on

output.

dissipated. The energy is dissipated both in IC internal switch and in load resistance.

Figure 9: Active clamp equivalent principle schematic

Figure 10: Fast demag waveforms

I

LOAD

I

OUT

V

IN

t

V

OUT

V

CC

V

t

t