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AN2761 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN2761
Description  Solution for designing a transition mode
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2761 Datasheet(HTML) 21 Page - STMicroelectronics

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AN2761
Designing a TM PFC
Doc ID 14690 Rev 2
21/36
Because the internal current sense clamping sets the maximum current that can flow in the
inductor, the maximum peak of the inductor current is calculated considering the maximum
voltage Vcsmax allowed on the L6562A (in the datasheet):
The calculated ILpkx is the limit at which the boost inductor saturates and it is used for
calculating the inductor number of turns and air gap length.
The power dissipated in Rs is given by:
According to the result two parallel resistors of 0.68
Ω with 0.25 W of power rating have
been selected.
●
Pin 3 (MULT): The MULT pin is the second multiplier input. It is connected, through a
resistive divider, to the rectified mains to get a sinusoidal voltage reference. The
multiplier can be described by the relationship:
where:
–VCS (multiplier output) is the reference for the current sense
–
k = 0.38 (typ) is the multiplier gain
–VCOMP is the voltage on pin 2 (E/A output)
–VMULT is the voltage on pin 3
(58)
(59)
(60)
s
max
pkx
R
Vcs
IL
=
A
41
.
3
34
.
0
V
16
.
1
IL
pkx
=
Ω
=
2
rms
s
s
ISW
R
P
⋅
=
(
)
W
35
.
0
A
01
.
1
34
.
0
P
2
s
=
⋅
Ω
=
MULT
COMP
CS
V
)
V
5
.
2
V
(
k
V
⋅
−
⋅
=



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