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VIPER35 数据表(PDF) 36 Page - STMicroelectronics

部件名 VIPER35
功能描述  Quasi-resonant high performance off line high voltage converter
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

VIPER35 数据表(HTML) 36 Page - STMicroelectronics

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Operation description
VIPer35
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DocID026980 Rev 4
Figure 42. Burst mode timing: light load management
8.15
Brown-out
Brown-out protection is a not-latched shutdown function active when a condition of mains
undervoltage is detected. The brown-out comparator is internally referenced to VBRth
threshold (see Figure 10) and disables the PWM if the voltage applied to BR pin is below
this internal reference. Under this condition the power MOSFET turns 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 43. A voltage
hysteresis improves the noise immunity.
The switching operation restarts as the voltage on the pin is above the reference plus the
voltage hysteresis. The brown-out comparator is provided with a current hysteresis, IBRhyst.
The designer has to set the rectified input voltage above which the power MOSFET starts
switching after brown-out event, VINon, and below which the power MOSFET switches off,
VINoff. Thanks to the IBRhyst, see Table 7, these two thresholds can be set separately.
When VINon and VINoff levels are fixed, with reference to Figure 43, the following
relationships can be established to calculate RH and RL resistors:
Equation 12
Equation 13
time
time
time
VCOMP
VFBbm
VFBbm +VFBbmhys
IDD1
IDD0
IDD
IDRAIN
ID_BM
Burst mode
GIPG2801151121LM
R
L
V
BRhyst
I
BRhyst
---------------------
–
V
INon
V
INoff
V
BRhyst
–
–
V
INon
V
BRth
–
---------------------------------------------------------------
V
BRth
I
BRhyst
------------------
⋅
+
=
R
H
V
INon
V
INoff
V
BRhyst
–
–
I
BRhyst
---------------------------------------------------------------
R
L
R
L
V
BRhyst
I
BRhyst
---------------------
+
----------------------------------
⋅
=



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