PS2602 datasheet(31/38 Pages) NEC

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At normal temperature (TA = 25

°C), the collector cut-off current ICEO is very little (about 1 nA (at VCE = 80 V and CTR = about

400% )), but it will be multiplied by about 10 at an increment of 25

°C. This needs to be kept in mind when using a small output

current (IC) of an optocoupler with a high load.

The rate change of VCE (sat) (Collector Saturation Voltage) is about 0.7% per

°C at ambient temperature of 0°C to 70°C. In circuit

design, the collector output current IC should be determined under the condition of half or less of the CTR rated values. Other-

wise, the saturation voltage VCE (sat) will become greater.

CHARACTERISTICS OF PS2502 AND PS2506 OPTOCOUPLERS

The PS2502 and PS2506 optocouplers are higher in sensitivity than the PS2501 and PS2505 optocouplers and can be driven by

low currents.

CTR-Related Characteristics

The PS2502 and PS2506 optocouplers assure CTR

⊕ 200% at IF = 1 mA and can be directly driven by CMOS output signals.

See 3.1 for CTR definition and characteristics.

Change of CTR Over time

Figure 22 shows the CTR vs. time characteristics of the PS2502 and PS2506 optocouplers.

Figure 22. CTR vs. Time Characteristics (Standard Value)

Standard values Continuous supply of

IF = 1 mA

1.2

1.0

0.8

0.6

0.4

0.2

TA = 25˚C

TA = 60˚C

Time (Hr)

PS2602 Datasheet(PDF) 31 Page - NEC