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VIPER25HDTR Datasheet(PDF) 25 Page - STMicroelectronics

No. de pieza VIPER25HDTR
Descripción Electrónicos  Off-line high voltage converters
PDF  40 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER25HDTR Datasheet(HTML) 25 Page - STMicroelectronics

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VIPER25
Operation description
Doc ID 15585 Rev 4
25/40
Figure 31.
Typical power capability vs input voltage in quasi-resonant converter’s
In order to proper select the value of the resistance RFF (see Figure 32 on page 26), once
are known the proper IDlim set points at minimum and at the maximum converter input
voltage. The following approximated formula calculates the value of the resistor RFF
Equation 3
Where:
●
Vin_Max and Vin_min are the maximum and minimum converter rectified input voltage
●
naux is the primary to auxiliary winding turn ratio
●
IZCD1, and IZCD2 are the currents needed to sink from the ZCD pin, in order to obtain
the selected IDlim set points, respectively at Vin_max and Vin_min, the graph IDlim vs IZCD
current is reported on Figure 16 on page 12).
The RLIM Value can be calculated from the following formula knowing the RFF value:
Equation 4
Where:
VZCD1 and VZCD2 are the ZCD pin voltages when the sunk current is IZCD1 and IZCD2
respectively (see Figure 15 on page 12).
 
Vin
Vinmin
11.522.5
3
3.5
4
0.5
1
1.5
2
2.5
system optimally
compensated
system not
compensated
)
I
I
(
n
V
V
R
2
ZCD
1
ZCD
aux
min
_
in
max
_
in
FF
−
⋅
−
=
⎟⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎠
⎞
⎜⎜
⎜
⎜
⎜
⎜
⎜
⎜
⎝
⎛
+
−
+
−
=
FF
2
ZCD
aux
max
_
in
2
ZCD
2
ZCD
FF
1
ZCD
aux
min
_
in
1
ZCD
1
ZCD
LIM
R
V
n
V
I
V
,
R
V
n
V
I
V
Max
R



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