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IPS161HTR Fiches technique(PDF) 18 Page - STMicroelectronics

No de pièce IPS161HTR
Description  Ground disconnection protection
PDF  25 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

IPS161HTR Fiches technique(HTML) 18 Page - STMicroelectronics

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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.
The OUT pin is pulled down to Vdemag. The conduction state is modulated by an 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 IC internal switch and in load resistance.
Figure 9: Active clamp equivalent principle schematic
Figure 10: Fast demag waveforms
I
LOAD
tDEMAG
I
OUT
V
IN
t
tON
V
OUT
V
CC
V
CC-VDEMAG
t
t



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