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

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.