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AN4213 Datasheet(PDF) 29 Page - STMicroelectronics

Part # AN4213
Description  Fluorescent lamps are increasingly driven by electronic
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4213 Datasheet(HTML) 29 Page - STMicroelectronics

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DocID023984 Rev 2
29/42
AN4213
Driving optimization
The driving circuit, R
g
= 220
Ω and the diode D, allows the Power MOSFET to not have turn-
on too quickly, reducing the discharge of snubber capacitor and consequently guaranteeing
negligible switch-on losses and thanks to the diode, it allows the fastest discharge of
parasitic capacitance of the Power MOSFET and therefore speeds up the switch-off.
A comparison has been performed between two different driving networks in order to find
the best solution. The following figures show the waveforms of various conditions.
Figure 19. Turn-off detail with Rg=220 Ω, speed
off diode and Csn= 47 pF @ 230 VAC
Figure 20. Turn-off detail with Rg=220 Ω, speed
off diode and Csn=100 pF @ 230 VAC
Figure 21. Turn-on detail with Rg= 220 Ω, speed
off diode and Csn = 47 pF @ 230 VAC
Figure 22. Turn-on detail with Rg= 220 Ω, speed
off diode and Csn= 100 pF @ 230 VAC
AM17333v1
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d
d
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V
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g
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AM17334v1
ss
d
d
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d
d
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g
V
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ff
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E
E
AM17335v1
ss
d
d
V
V
d
d
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ss
g
g
V
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n
n
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AM17336v1
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d
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d
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ss
g
g
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E



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