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VIPER25HD Datasheet(PDF) 33 Page - STMicroelectronics

Part No. VIPER25HD
Description  Off-line high voltage converters
Download  40 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER25HD Datasheet(HTML) 33 Page - STMicroelectronics

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VIPER25
Operation description
Doc ID 15585 Rev 4
33/40
Fixed the VINon and the VINoff levels, with reference to Figure 38, the following relationships
can be established for the calculation of the resistors RH and RL:
Equation 12
Equation 13
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 BR pin has to be connected to GND, ensuring that
the voltage is lower than the minimum of VDIS threshold (50 mV, see Table 8). In order to
Figure 38.
Brown-out protection: BR external setting and timing diagram
-
+
Disable
C
BR
V
DIS
-
+
V
in_OK
V
BRth
R
H
I
BRhyst
R
L
V
IN_DC
VDD
+
V
OUT
V
IN
V
INon
V
INoff
V
DRAIN_START
V
BR
V
in_OK
I
BR
V
BRth
I
BRhyst
V
DD
V
DDon
V
DDoff
V
DS
V
DD(RESTART)
BRhyst
BRth
BRth
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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