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VIPER17HN Folha de dados(PDF) 26 Page - STMicroelectronics

Nome de Peças VIPER17HN
Descrição Electrónicos  Off-line high voltage converters
PDF  31 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER17HN Folha de dados(HTML) 26 Page - STMicroelectronics

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Operation descriptions
VIPER17
26/31
Fixed the VINon and the VINoff levels, with reference to Figure 31, the following relationships
can be established for the calculation of the resistors RH and RL:
Equation 9
Equation 10
For a proper operation of this function, VIN on must be less than the peak voltage at
minimum mains and VIN off less than the minimum voltage on the input bulk capacitor at
minimum mains and maximum load.
The BR pin is a high impedance input connected to high value resistors, thus it is prone to
pick up noise, which might alter the OFF threshold when the converter operates or gives
origin to undesired switch-off of the device during ESD tests.
It is possible to bypass the pin to ground with a small film capacitor (e.g. 1-10 nF) to prevent
any malfunctioning of this kind.
If the Brown-out function is not used the pin has to be connected to GND.
Figure 31. Brown-out protection: BR external setting and timing diagram
Rh
Rl
AC_OK Disable
BR
0.1V
VinOK
Vcc
+
-
0.45V
15u
HV Input bus
HV Input bus
VinOK
Vcc
(pin 3)
VinON
VinOFF
VDS
Vout
BR
0.45V
IBR HYS
15 µA
t
t
t
t
t
t
t
HV Input bus
VinOK
Vcc
(pin 3)
VinON
VinOFF
VDS
Vout
0.45V
15 µA
t
t
t
t
t
t
t
VDD
VDD
BRHYST
BR
BR
INoff
BRHYST
INoff
INon
BRHYST
BRHYST
L
I
V
V
V
V
V
V
I
V
R
×
−
−
−
+
−
=
BRHYST
BRHYST
L
L
BRHYST
BRHYST
INoff
INon
H
I
V
R
R
I
V
V
V
R
+
×
−
−
=



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