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MS1003SH Datasheet(PDF) 25 Page - Shindengen Electric Mfg.Co.Ltd

Part # MS1003SH
Description  Control IC
PDF  41 Pages
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Manufacturer  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Direct Link  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MS1003SH Datasheet(HTML) 25 Page - Shindengen Electric Mfg.Co.Ltd

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MS1003SH･MS1004SH
Application Note Ver.2.2
SHINDENGEN ELECTRIC MFG. CO. , LTD
25/41
* In place of the coefficient A in the formulas, substitute 1 for the MS1003SH and 2 for the MS1004SH.
35
ON range
)
(OCL
DC
R
V
Vburst
Lp
ton
[s]
36
OFF range
tq
A
V
V
Np
ton
N
V
toff
F
O
S
DC
)
1
2
(
)
(
1
1
1
[s]
37
Main SW device peak current
)
(OCL
DP
R
Vburst
I
[A]
38
Auto burst start/end power
)
(
2
)
(
toff
ton
R
ton
Vburst
V
Po
OCL
DC
[W]
5.4.5 Formulas for obtaining droop point power
Vth (ocl) varies with input voltage. First, calculate the input voltage VDC (clamp) at the point of change in Vth
(ocl). If VDC does not exceed VDC (clamp), apply the formulas in 1). If VDC exceeds VDC (clamp), apply the
formulas in 2).
Just as in Section 5.4.3, use the following formula to obtain the input voltage at the point of change in Vth
(ocl).
26
Input voltage at the point of
change in Vth (ocl)
)
(
)
(
)
(
OCL
clamp
OCL
clamp
DC
R
TOCL
Vth
Lp
V
[V]
The chart below shows a model curve of the relationship between input voltage and droop point power.
Calculated droop point
power determined by
OCL resistance
Calculated droop point
power corrected by the
OCL correction function
OCL correction
starts at this point.
Input voltage VDC [V]



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