AN4402 Datasheet, PDF (29/39 Pages) STMicroelectronics – Multichannel drivers driving inductive loads

AN4402
Energy capability and load compatibility
Table 12. Application conditions (continued)
Parameter
Value
V_BAT,MAX (jump start)
V_BAT,TYP
24V  I_{L0 @}V_BAT,MAX = 0.522A, low probability of occurrence
13.5V  I_{L0 @}V_BAT,TYP = 0.293A, nominal conditions
Note:
Step 1: Calculation of t_DEMAG and E_DEMAG
The demagnetization energy and the demagnetization time under the conditions listed in
Table 12 are given by Equation 19 and Equation 11:
E_{DEMAG_LS} = 83.6 mJ and t_{DEMAG_LS} = 11.7 ms with V_BAT,MAX = 24 V
E_{DEMAG_LS} = 16.6 mJ and t_{DEMAG_LS} = 4.2 ms with V_BAT,TYP = 13.5 V
The validity condition of Equation 19 is satisfied since R_P > 21 Ω (for V_BAT = 24 V) and
R_P > 74 Ω (for V_BAT = 13.5 V).
Step 2: Maximum energy capability of the L99MC6 at the relevant t_DEMAG
Considering the type of output, the relevant diagram of the datasheet is: “Configurable
switch LSD – Maximum turn-off current versus inductance” (Figure 16).
If the considered output is one of the fixed low-side switches (outputs 4, 5, 6) or one of the
outputs configured as high-side driver, the relevant diagrams are respectively “Fixed LSD
switch – Maximum turn-off current versus inductance” and “Configurable switch HSD–
Maximum turn-off current versus inductance”.
Figure 16. Datasheet L99MC6 - Inductive energy capability of configurable channels,
configured as low-side switch

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