AN4402 datasheet(23/39 Pages) STMICROELECTRONICS

Il numero della parte	AN4402

Spiegazioni elettronici	Multichannel drivers driving inductive loads

PDF	39 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

Logo

23 / 39 page

DocID025557 Rev 1

23/39

AN4402

Demagnetization energy

3.4.2

Example of a low-side configured output of the L99MC6

Figure 13 shows that under the considered conditions (Table 8), the simplification RL = 0 Ω

leads to a significant overestimation of the dissipated energy in the low-side driver. The

overestimation is even greater as VBAT increases (Table 9).

Figure 13. EDEMAG_LS vs VBAT – Example of a low-side output of the L99MC6

Figure 14 displays the relative evolution of EDEMAG with VBAT. The reference is for

Table 8. Low-side output - conditions

Parameter

Value

512 mH

400

VCL_LS

35 V (typical value of the L99MC6)

Table 9. Overestimation of EDEMAG caused by the simplification: RL = 0 Ω

VBAT

EDEMAG [mJ]

RL > 0Ω, RP = 400Ω

EDEMAG [mJ]

RL = 0Ω (w/o RP)

Overestimation of EDEMAG

[mJ] with RL = 0 Ω

0.9

5.2

4.3

10V

6.6

11.4

16V

26.9

57.1

30.2

24V

83.6

221

137

AN4402 Scheda tecnica(PDF) 23 Page - STMicroelectronics