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AN4402 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN4402
Description  Multichannel drivers driving inductive loads
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4402 Datasheet(HTML) 9 Page - STMicroelectronics

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AN4402
Active clamp of the L99MC6 and L9733
38
2.2.2
Case 2: VBAT ≥ VCL_LS - VCL_HS
At the turn-off, the evolution of the voltage across the inductor causes an increase of VDS
until VDS = VCL_LS. Then, the gate-drain clamp is activated (see Figure 5), like for a low-side
switch. VDS is maintained at VCL_LS = VZENER_HS + VF + VGS_TH.
Since VS = VBAT - VCL_LS > - VCL_HS, this prevents the activation of the gate-source clamp.
Figure 5. L99MC6 high-side during the turn-off, VBAT > VCL_LS - VCL_HS
Case 2 corresponds to a demagnetization of the inductive load for VBAT ≥ 16 V for the
L99MC6 and for VBAT ≥ 36 V for the L9733.



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