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VIPER26 датащи(PDF) 16 Page - STMicroelectronics

номер детали VIPER26
подробное описание детали  Fixed frequency VIPerTM plus family
PDF  25 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER26 датащи(HTML) 16 Page - STMicroelectronics

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Burst mode
VIPER26
16/25
Doc ID 17736 Rev 2
13
Burst mode
When the voltage VCOMP drops below the threshold, VCOMPL, the power MOSFET is kept in
OFF state and the consumption is reduced to IDD0 current, as reported on Table 7 on
page 6. As reaction at the energy delivery stop, the V
COMP voltage increases and as soon
as it exceeds the threshold VCOMPL + VCOMPL_HYS, the converter starts switching again with
consumption level equal to IDD1 current. This ON-OFF operation mode, referred to as “burst
mode” and reported on
Figure 25 on page 16, reduces the average frequency, which can go
down even to a few hundreds hertz, thus minimizing all frequency-related losses and
making it easier to comply with energy saving regulations. During the burst mode, the drain
current limit is reduced to the value IDlim_bm (reported on Table 8 on page 7) in order to
avoid the audible noise issue.
Figure 25.
Load-dependent operating modes: timing diagrams
Figure 24.
COMP pin voltage versus IDLIM
time
time
time
V
COMP
V
COMPL +VCOMPL_HYS
V
COMPL
I
DD1
I
DD0
I
DD
I
DRAIN
I
Dlim_bm
Burst Mode



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