AN4213 datasheet(31/42 Pages) STMICROELECTRONICS

部件名	AN4213

功能描述	Fluorescent lamps are increasingly driven by electronic

PDF	42 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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DocID023984 Rev 2

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AN4213

Driving optimization

Here below is the summary table, in terms of dissipated energy during both turn-on and

turn-off detail.

Table 2 shows, the best compromise in terms of switching losses, is to have a smaller

snubber capacitor, C

= 47 pF, in order to reduce the peak on the drain current during turn-

on (as shown in

Figure 21) and R

= 220

Ω with speed off diode in order to speed up the

device turn-off (as shown in

Figure 19.). In fact a greater R

provides a slower switch-on of

the Power MOSFET, reduces the snubber capacitor discharge, guaranteeing negligible

power losses during turn-on.

Table 2. Summary table of dissipation energy

Driving conditions

Eon (µJ)

Eoff (µJ)

Etot (µJ)

=220

Ω, speed off diode, C

= 47 pF

1.27

6.39

7.66

=220

Ω, speed off diode, C

= 100 pF

2.05

6.22

8.72

=220

Ω, no speed off diode, C

= 47 pF

1.25

12.46

13.71

=220

Ω, no speed off diode, C

= 100 pF

1.66

10.56

12.22

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