MS1003SH datasheet(23/41 Pages) SHINDENGEN

23 / 41 page

MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

23/41

[Condition 1] The operating frequency fulfills T (bottom_skip_stop).

* In place of coefficient A in the formulas, substitute 1 for the MS1003SH and 2 for the MS1004SH.

ON range

)

(

)

(

)

(

ip_stop)

(bottom_sk

ton



















[s]

OFF range

ton

toff









ip_stop)

(bottom_sk

[s]

Main SW device peak

current

ton





[A]

Trough skip end power 1

)

(

ip_stop)

(bottom_sk

ton











[W]

[Condition 2] The OCL pin voltage reaches the current detection threshold voltage in trough skip mode.

Under this condition, 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).

The input voltage at the point of change in Vth (ocl) is obtained with the following formula.

Input voltage at the point of

change in Vth (ocl)

)

(

)

(

)

(

OCL

clamp

OCL

clamp

TOCL

Vth





[V]

Input voltage VDC [V]

Trough skip hysteresis

with input voltage of

VDC (clamp) or below

Trough skip hysteresis

with input voltage of

VDC (clamp) or above

Calculation line of

trough skip start

power

Calculation line of

trough skip end power

condition 1

Calculation line of trough skip

end power condition 2

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