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VIPER37 bảng dữ liệu(PDF) 30 Page - STMicroelectronics

tên linh kiện VIPER37
Giải thích chi tiết về linh kiện  VIPerPlus family: fixed frequency offline converter
PDF  35 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER37 bảng dữ liệu(HTML) 30 Page - STMicroelectronics

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Operation description
VIPER37
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Doc ID 022218 Rev 1
When the VINon and the VINoff levels are fixed, with reference to Figure 33, 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, it is therefore prone
to pick up noise, which might alter the OFF threshold when the converter operates or
creates an 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 brownout function is not used, the BR pin must be connected to GND, ensuring that
the voltage is lower than the minimum VDIS threshold (50 mV), see Table 8.
Figure 33.
Brownout protection: BR external setting and timing diagram
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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