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VIPER25LDTR Datasheet(PDF) 27 Page - STMicroelectronics

Part # VIPER25LDTR
Description  Off-line high voltage converters
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER25LDTR Datasheet(HTML) 27 Page - STMicroelectronics

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VIPER25
Operation description
Doc ID 15585 Rev 4
27/40
Equation 6
Where:
●
VOVP is the OVP threshold (see Table 8 on page 8)
●
VOUT OVP is the converter output voltage value to activate the OVP (set by designer)
designer
●
NAUX is the auxiliary winding turns
●
NSEC is the secondary winding turns
●
VDSEC is the secondary diode forward voltage
●
VDAUX is the auxiliary diode forward voltage
●
ROVP together RLIM make the output voltage divider
Than, fixed RLIM, according to the desired IDlim, the ROVP can be calculating by:
Equation 7
The resistor values will be such that the current sourced and sunk by the ZCD pin be within
the rated capability of the internal clamp.
Figure 33.
OVP timing diagram
k
OVP
R
LIM
R
LIM
R
OVP
+
----------------------------------
=
R
OVP
R
LIM
1k
OVP
–
k
OVP
-----------------------
×
=
t
VAUX
VOVP
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
ZCD
2 µs
0.5 µs
OVP
FAULT
0
0
0
0 →1
1 →2
2 →0
0 →1
1 →2
2 →3
3 →4
0
E
R
U
L
I
A
F
P
O
O
L
K
C
A
B
D
E
E
F
E
C
N
A
B
R
U
T
S
I
D
Y
R
A
R
O
P
M
E
T
N
O
I
T
A
R
E
P
O
L
A
M
R
O
N
t
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
2 µs
0.5 µs
OVP
FAULT
0
0
0
0 →1
1 →2
2 →0
0 →1
1 →2
2 →3
3 →4
0
E
R
U
L
I
A
F
P
O
O
L
K
C
A
B
D
E
E
F
E
C
N
A
B
R
U
T
S
I
D
Y
R
A
R
O
P
M
E
T
N
O
I
T
A
R
E
P
O
L
A
M
R
O
N
t



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