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VIPER28LE Datasheet(PDF) 19 Page - STMicroelectronics

Part # VIPER28LE
Description  Off-line high voltage converters
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER28LE Datasheet(HTML) 19 Page - STMicroelectronics

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VIPER28
Operation descriptions
Doc ID 15028 Rev 5
19/32
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
●
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 4
The resistor values will be such that the current sourced and sunk by the CONT pin be
within the rated capability of the internal clamp.
Figure 22.
OVP timing diagram
R
OVP
R
LIM
1k
OVP
–
k
OVP
-----------------------
×
=
t
VDS
VAUX
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
VCONT
T
STROBE
OVP
FAULT
0
0
0
0
→11 →22 →0
0
→11 →22 →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
VDS
V
OVP
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
OVP
FAULT
0
0
0
0
→11 →22 →0
0
→11 →22 →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
Sampling time



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