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VIPER17LN Datasheet(PDF) 20 Page - STMicroelectronics

Part # VIPER17LN
Description  Off-line high voltage converters
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER17LN Datasheet(HTML) 20 Page - STMicroelectronics

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Operation descriptions
VIPER17
20/31
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 26. OVP timing diagram
R
OVP
R
LIM
1k
OVP
–
k
OVP
-----------------------
×
=
t
VDS
VAUX
3V
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
CONT
(pin 4)
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
NORMAL OPERATION
TEMPORARY DISTURBANCE
FEEDBACK LOOP FAILURE
t
VDS
3V
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
(pin 4)
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
NORMAL OPERATION
TEMPORARY DISTURBANCE
FEEDBACK LOOP FAILURE
t



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