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DFS04M Scheda tecnica(PDF) 25 Page - STMicroelectronics

Il numero della parte DFS04M
Spiegazioni elettronici  APPLICATION NOTE
PDF  42 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

DFS04M Scheda tecnica(HTML) 25 Page - STMicroelectronics

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AN1262 APPLICATION NOTE
Figure 12. Secondary feedback: TL431 + optocoupler circuit (I)
Table 16. G1(j
ω) Implementation: secondary feedback (I)
This technique provides very good regulation of the output voltage and galvanic isolation from the primary side
at the same time.
In Table 16 it is possible to find the design relationships useful to derive the part values. Icmax is specified in
the Datasheet (2.5mA).
The following condition should be met:
,
(20)
otherwise t will not be possible to find a positive value for RF. If the condition (20) is not met, an optocoupler with
a narrower CTRmin - CTRmax spread should be selected. If that is not possible, either a higher fc or a lower Φm
should be selected and the calculations from step a) to step e) redone.
Symbol
Definition
RL
RL ≈ 0.27 to 2.7 [kΩ]
RH
RB
CF
RF
CCOMP
Vout
RB
RH
RL
TL431
CF
L6590
L6590D
L6590A
COMP
VK
IF
IC
CCOMP
IC
VCOMP
1.5
3.5
RCOMP =
∆VCOMP
∆IC
1 mA
VFB
Not needed
in the L6590A
RF
R
H
V
out
2.5
–
2.5
-------------------------
R
L
⋅
=
R
B
CTR
min
V
out
3.5
–
I
Cmax
-------------------------
⋅
<
C
F
CTR
max
R
COMP
⋅
R
B
R
H
G1
0
⋅⋅
-----------------------------------------------
=
R
F
1
2
π f
Z
C
F
⋅⋅
⋅
--------------------------------
R
H
–
=
C
CO M P
1
2
π f
P
R
COMP
⋅⋅
⋅
---------------------------------------------
=
CTR
max
CTR
min
-----------------------
G1
c
π
180
----------
Φ1
c
⋅


tan
R
CO MP
-------------------------------------------
V
out
3.5
–
I
Cmax
-------------------------
⋅⋅
≤



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