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CS1600-FSZ bảng dữ liệu(PDF) 11 Page - Cirrus Logic

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Giải thích chi tiết về linh kiện  Low-cost PFC Controller for Electronic Ballasts
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CS1600
DS904A5
11
5. FLUORESCENT BALLAST APPLICATION EXAMPLE
The following section gives an example for a front-end PFC stage design for an electronic ballast application. The equations that
follow may be used as guidelines for any other requirements using the CS1600.
5.1
Component Selection Guidelines
The following design example is for a wide-input-voltage
fluorescent ballast application using 2 T5 lamps in series for a
total nominal power of 108W.The target specifications for the
PFC portion of the design, assuming a 94% efficient second
stage, are as follows:
5.1.1
IAC and IFB Sense Resistors
The rectified line voltage, VAC, and the output voltage of the
PFC boost converter, Vlink, are scaled as currents by using
sense resistors, whose values are estimated based on the
equations below:
where
RFB = Feedback resistor used to reflect the PFC output
voltage
RAC = Feedforward resistor used to reflect the rectified line
voltage
Vlink= PFC Output Voltage
VDD = IC Supply Voltage
Iref = Target reference current used for feedback
1% or lower tolerance resistors are recommended to
maximize the tightly toleranced system behavior provided by
the unique digital controller in the CS1600. Resistors may be
separated into two or more series elements if voltage
breakdown and/or regulatory compliance is of concern.
5.1.2
PFC Input Filter Capacitor
For a typical 115 W PFC output stage required to power up a
108 W fluorescent ballast, an input filter capacitance of
0.33
μF is recommended. Capacitor tolerances and the value
of the EMI filter capacitor need to be considered when
selecting the value of the capacitor to be used in this
application.
D6
C1
D5
C2
BR1
BR1
BR1
BR1
AC
Mains
+12V
L1
Q1
R3
CS1600
IAC
NC
FB
STBY
VDD
GND
NC
GD
2
3
1
7
8
6
4
5
R1a
R1b
R2b
R2a
C3a
C3b
R2c
R1c
RAC
RFB
Clink
Figure 17. CS1600 Basic Application Circuit
Vin(min)
108 VAC
Vin(max)
305 VAC
Vlink
460 V
Po
115 W
η
95%
R
FB
V
link
V
dd
I
ref
----------------------------
=
R
FB
460
12
130
10
6
×
----------------------------
=
R
FB
3.45M
Ω
=
[Eq.4]
R
AC
R
FB
=
R
AC
3.45M
Ω
=
[Eq.5]


Số phần tương tự - CS1600-FSZ

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