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VIPER17LDTR Datasheet(PDF) 25 Page - STMicroelectronics

Part # VIPER17LDTR
Description  Off-line high voltage converters
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER17LDTR Datasheet(HTML) 25 Page - STMicroelectronics

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VIPER17
Operation descriptions
25/33
7.12
Brown-out protection
Brown-out protection is a not-latched shutdown function activated when a condition of mains
under voltage is detected.
The Brown-out comparator is internally referenced to VBRth,0.45 V typ value, and disables
the PWM if the voltage applied at the BR pin is below this internal reference. Under this
condition the power MOSFET is turned off. Until the Brown out condition is present, the VDD
voltage continuously oscillates between the VDDon and the UVLO thresholds, as shown in
the timing diagram of Figure 31 on page 25. A voltage hysteresis is present to improve the
noise immunity.
The switching operation is restarted as the voltage on the pin is above the reference plus the
before said voltage hysteresis. See Figure 31.
The Brown-out comparator is provided also with a current hysteresis, IBRhyst.With this
approach is possible to set the VINon threshold and VINoff thresholds separately, by properly
choosing the resistors of the divider connect to the BR pin.
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
Figure 31. Brown-out protection: BR external setting and timing diagram
Rh
Rl
AC_OK Disable
BR
0.1V
VinOK
Vcc
+
-
0.45V
10u
HV Input bus
HV Input bus
VinOK
Vcc
(pin 3)
VinON
VinOFF
VDS
Vout
BR
0.45V
IBRhyst
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
BRth
BRth
INoff
BRhyst
INoff
INon
BRhyst
BRhyst
L
I
V
V
V
V
V
V
I
V
R
×
−
−
−
+
−
=



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