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CS1500-FSZ Datasheet(PDF) 12 Page - Cirrus Logic

Part # CS1500-FSZ
Description  Digital Power Factor Correction IC
PDF  22 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS1500-FSZ Datasheet(HTML) 12 Page - Cirrus Logic

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CS1500
12
DS849A5
May ?$shortyear>
CONFIDENTIAL
4. APPLICATION EXAMPLE
The following sections describe an example application. The
example is based upon the typical connection diagram
illustrated in Figure 21.
Equations are provided to demonstrate how a user would
calculate the values for the components shown in the diagram.
4.1 PFC for Power Supply Application
The following design example is for a universal main input,
front-end PFC converter with the following parameters:
4.1.1
IAC and IFB Sensing Inputs
The rectified AC input voltage (Vrect) and boosted PFC output
voltage (Vlink) are sensed as currents into the IC. The sensing
currents are set by resistors RAC and RFB, respectively:
Maximum power dissipation in each sense resistor is
calculated as follows (the equation ignores the voltage drop
across RIAC & RIFB):
D2
C1
D1
C S1500
C2
L B
C3
Q1
6
2
8
4
5
7
3
1
R1a
R1b
R2a
R2b
R3
FB
GD
NC
STBY
GND
VDD
IAC
NC
RAC
RFB
BR1
AC
Mains
Regulated
DC Output
Figure 21. CS1500 Basic Application Circuit
Vin(min)
90 VAC
Vin(max)
265 VAC
Vlink
400 V
Po
90 W
R
FB
V
link
V
dd
–
I
ref
----------------------------
=
R
FB
400
12
–
129
10
6
–
×
----------------------------
=
R
FB
3.0M
Ω
=
[Eq.6]
R
AC
R
FB
=
R
AC
3.0M
Ω
=
[Eq.7]
PR
FB
()
V
link
2
R
FB
---------------
=
PR
FB
()
400
2
310
6
×
------------------
=
PR
FB
()
53.3mW
=
[Eq.8]
PR
AC
()max
265
2
310
6
×
-------------------
=
PR
AC
()max
V
in max
()
[]
2
R
AC
-----------------------------
=
PR
AC
()max
23.4mW
=
[Eq.9]



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