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AN2708 Datasheet(PDF) 12 Page - STMicroelectronics

No. de pieza AN2708
Descripción Electrónicos  2X36 W digital dimmable ballast with L6574 and ST7FDALI
PDF  42 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2708 Datasheet(HTML) 12 Page - STMicroelectronics

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High-frequency ballast
AN2708
12/42
The basic design specifications are listed in Table 4.
For reference, it is useful to define also the following quantities:
●
Input power: Pi (= Po /
η) ≈ 80 W
●
Maximum mains RMS current: Iirms (= Pi/Virms(min))
≈ 1 A
●
Rated output current: Io (= Po/Vo)
≈ 0.2 A
The design guidelines are deeply explained in AN966 ("L6561, enhanced transition mode
power factor corrector"), AN1757 ("Switching from the L6561 to the L6562) and AN1089
("control loop model of L6561-based TM PFC"). The main design formulas are summarized
as follows inTable 5.
Table 4.
PFC operating conditions
Parameter
Value
Mains voltage range: Virms(min) - Virms(max)
90 – 265 Vac
Regulated DC output voltage: Vo
400 Vdc
Rated output power: Po
75 W
Minimum switching frequency: fsw
35 kHz
Maximum output voltage ripple:
∆Vo
< ± 10 V
Maximum overvoltage admitted:
∆VOVP
60 V
Expected efficiency:
ηPFC
> 90 V
Table 5.
Power stage design equations
Input capacitor (C1)
Boost inductor
Power MOSFET (Q1)
Boost diode (D1)
where
where
where
Output capacitor (C6)
C1
Irms
2
π fsw r Vinrmsmin
⋅⋅
⋅
------------------------------------------------------------------------
=
r
0.01
0.1
÷
=
L
V
2
irms
Vo
2
Virms
⋅
–
()
⋅
2f
sw
Pi
Vo
⋅⋅
⋅
------------------------------------------------------------------------------
=
Volume
4K
L
I
2
irms
⋅⋅
≥
K1410
3
–
Ie
Igap
-------------
⋅⋅
≅
Pcu
4
3
---
I
2
irms
Rcu
⋅
⋅
=
BV
DSS
Vo
∆V
OVP
Vm
in
arg
++
=
Pon
I
2
Qrms
R
DS on
()
⋅
=
I
Qrms
2 2
Iirms
1
6
---
42
9
π
-----------
Virms
Vo
-----------------
⋅
–
⋅
⋅
=
Pcross
Vo
Iirms
t
fall
f
sw
⋅⋅
⋅
=
Pcap
3.3Coss
V
1.5
drain
1
2
--- Cd
V
2
drain
⋅
+
⋅
⎝⎠
⎛⎞
f
sw
⋅
=
V
RRM
1.2
Vo
⋅
=
I
F
3Io
⋅
=
P
losses
V
T
I
DC
Rd
I
2
rms
⋅
+
⋅
=
C6
Po
4
π fVo ∆Vo
⋅⋅
⋅
--------------------------------------------------
≥



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