AN4402 datasheet(30/39 Pages) STMICROELECTRONICS

30 / 39 page

Energy capability and load compatibility

AN4402

30/39

DocID025557 Rev 1

Figure 16 displays the maximum allowed current of outputs 1, 2 or 3 (configurable outputs)

in low-side configuration, driving an inductive load. Different conditions (single or repetitive

pulses) and start temperature (junction temperature right before the switch-off phase of the

MOSFET) are considered. The test conditions for these curves are VBAT = 13.5 V and

RL = 0 Ω. These conditions are different from the application conditions and are therefore

not directly applicable to our specific case.

One way to verify the load compatibility consists in building the curve EDEMAG,MAX versus

the corresponding tDEMAG from the relevant I-L plot of Figure 16, where EDEMAG,MAX is the

maximum energy which the device can sustain.

Condition 1: The jump start conditions (VBAT,MAX = 24 V) have a very low probability of

occurrence. The single pulse is applicable. From Figure 17, we see that the energy

capability of the device for a single pulse at 11.7ms is higher than the energy dissipated in

the application conditions.

Figure 17. EDEMAG_MAX vs tDEMAG for a single pulse TJSTART = 150°C

Condition 2 (VBAT,TYP = 13.5 V) corresponds to the nominal conditions with TJ = 100 °C:

The repetitive pulse condition is applicable. Building the curve EDEMAG,MAX versus the

corresponding tDEMAG for repetitive pulses at TJSTART = 100 °C from Figure 16, we obtain

Table 14 and Figure 18.

Table 13. EDEMAG_MAX and corresponding tDEMAG for a single pulse, TJSTART = 150°C,

RL = 0 Ω, VBAT = 13.5 V

L [mH]

IL0 [A]

tDEMAG [ms]

RL = 0 Ω VBAT = 13.5 V

EDEMAG_MAX [mJ]

RL = 0 Ω VBAT = 13.5 V

400

0.542

9.9

500

0.536

12.2

114

600

0.530

14.4

134

700

0.525

16.7

153

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