MS1003SH datasheet(25/41 Pages) SHINDENGEN

25 / 41 page

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.

ON range

)

(OCL

Vburst

ton





[s]

OFF range

ton

toff









)

(

)

(

[s]

Main SW device peak current

)

(OCL

Vburst



[A]

Auto burst start/end power

)

(

)

(

toff

ton

Vburst

OCL









[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).

Input voltage at the point of

change in Vth (ocl)

)

(

)

(

)

(

OCL

clamp

OCL

clamp

TOCL

Vth





[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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