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SC4525C датащи(PDF) 13 Page - Semtech Corporation

номер детали SC4525C
подробное описание детали  28V 3A Step-Down Switching Regulator
PDF  22 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4525C датащи(HTML) 13 Page - Semtech Corporation

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SC4525C
3
Applications Information (Cont.)
D1
SC4525C
BST
GND
IN
SW
D1
C1
VIN
D2
(a)
3V < VO < 8V
D1
(b)
SC4525C
BST
GND
IN
SW
C1
VIN
D2
D3
D2
D3
D3
VO < 2.5V
(C)
SC4525C
BST
GND
IN
SW
C1
VIN
D2
2.5V < VO < 3V
or VO > 8V
Figures 6 — Methods of Bootstrapping the SC4525C
Minimum Soft-start Capacitance CSS
To ensure normal operation, the minimum soft-start
capacitance C
SS can be calculated in terms of the output
capacitance C
O and output load current IO according to
the following equations.
Substituting the first equation into the second equation,
where V
SS is the soft-start capacitor voltage and ISS is the
soft-start charging current. V
 is the voltage defined in
Figure 2.
To ensure successful startup, the total current drawn
from the output must be less than the maximum output
capability of the part,
Substituting the third equation of this section into the
previous equation,
Rearranging,
Therefore the minimum C
SS depends on the output
capacitance and the load current. Larger C
SS is necessary
when starting into a heavy load (small R). If V
IN rise time
exceeds 00ms, then a larger C
SS may be necessary
to produce a monotonic rising output. Always verify
converter start-up on the bench.



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