PS2625 datasheet(18/38 Pages) NEC

номер детали	PS2625

подробное описание детали	Optocoupler Applications

PDF	38 Pages

Scroll/Zoom	100%

производитель	NEC [NEC]

домашняя страница	http://www.nec.com/

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18 / 38 page

(

)

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

When resistor RBE is serially connected to resistor RL (see Fig. 3-4 (c)), the reduction of a CTR becomes greater even if hFE2 is

approximately equal to hFE0 in expression (8) as the expression includes RL as a parameter.

Fig. 3-5 shows typical V0 vs. IF characteristics of the above circuits (a), (b), and (c).

PS2601

RBE = 100 k

Ω

Vcc = 10V

RL = 470 k

Ω

Forward current IF (mA)

Figure 3-5. Vo vs. IF Characteristics

The reduction of a CTR is greatly affected by the positional relationship between load resistor RL and base-emitter resistor RBE,

as shown in Fig. 3-4 (b) and 3-4 (c).

( 1 -

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

hFE1

VBE

hFE0

ICBL • RBE1

The output voltage V0, V1, and V2 of the above circuits (a), (b), and (c) are related as follows:

hFE2

hFE0

VBE2

1 -

ICBL • RBE1

RL • hFE2

1 +

RBE2

Figure 3-4 (a).

Open

ICBL

VBE

ICBL

RBE1

VBE1

Figure 3-4 (b).

RBE Serial to RL

ICBL

RBE2

VBE2

Figure 3-4 (c).

RBE Parallel to RL

Ω

(b) RBE = 100 k

Ω

(a) RB open

Vcc = 10 V

RL = 470

Ω

CTR = 190%

(PS2601)

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