M61880FP

Rev.1.0, Sep.19.2003, page 17 of 20

Meanwhile, ISW can be expressed as follows.

Isw = 2 • Iswo

−Isw2

............................ (7)

The relationship between ISW and

∆V is found as shown below.

Substituting Equation (6) in Equation (7),

(

)

I2

I1 + I2

............................ (8)

and further substituting Equation (3),

)

Id

250

µA

............................ (9)

Next, substituting Equation (2) gives the relationship between ISW and

∆V as follows.

)

∆V/2kΩ

250

µA

............................ (10)

A characteristic curve of the CH pin voltage and switching current is shown toward the end of “Electrical Characteristic

Graphs” following.