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AN4402 Scheda tecnica(PDF) 16 Page - STMicroelectronics

Il numero della parte AN4402
Spiegazioni elettronici  Multichannel drivers driving inductive loads
PDF  39 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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AN4402 Scheda tecnica(HTML) 16 Page - STMicroelectronics

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Demagnetization energy
AN4402
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DocID025557 Rev 1
We verify that the condition on RP (Equation 10) is satisfied: RP must be higher than 79 Ω.
Using the formulas of Table 2, we have:
Figure 9. EDEMAG_LS vs RP
RP dissipates a part of the energy stored in the inductor. As RP decreases, iP increases and
the amount of energy transferred from the inductor to RP increases as well.
Table 3. Example of application parameters
Parameter
Value
VBAT
13V
L512mH
RL
46
Ω
RP
200
Ω - 10kΩ and no R
P (RP →+ ∞)
VCL_LS
35V (typical value of the L99MC6)
Table 4. Energy parameters vs RP values
RP [Ω]tDEMAG_LS [ms]
EDEMAG_LS [mJ]
EDEMAG_LS decrease due to
RP [mJ]
200
2.9
8.3
15.3
300
3.6
12.4
11.2
400
4.0
14.8
8.8
600
4.3
17.5
6.1
1k
4.7
19.8
3.8
10k
5.1
23.2
0.4
No RP ( RP →+ ∞)
5.2
23.6
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