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AN2640 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2640
Description  Intelligent multipower digital ballast for fluorescent lamps
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2640 Datasheet(HTML) 6 Page - STMicroelectronics

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PFC section design criteria
AN2640
6/36
Figure 3.
Inductor current waveform and MOSFET timing
1.3.1
Power switch
It must be:
●
VDSS > Vout
●
ID > IT(pk)
Equation 4
Equation 5
Equation 6
Equation 7
Equation 8
Equation 9
Equation 10
V
out
420 V
=
P
omax
85 W
=
η 0.9
=
P
imax
P
omax
η
----------------
95 W
≅
=
V
imin rms
()
185 V
=
I
Lmax rms
()
P
imax
V
imin rms
()
--------------------------
510 mA
≅
=
I
Lpk
()
22
I
Lmax rms
()
1.5 A
≅
⋅⋅
=



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