Figure 15. Series LED Driver Circuit for HCPL-4701/-4731.

0

0

TS – CASE TEMPERATURE – °C

200

50

400

125

25

75 100

150

600

800

200

100

300

500

700

PS (mW)

IS (mA)

175

Figure 16. Thermal Derating Curve,

Dependence of Safety Limiting Value

with Case Temperature per VDE 0884.

4.7 µF

VCC

0.1 µF

+

R1

HCPL-47XX

ACTIVE OUTPUT

OR

OPEN COLLECTOR

R1 =

VCC – VF – VOL

IF

FOR VCC = 5 Vdc, IF = 40 µA

R1 = 82 k

Ω (TYPICAL)

R1 = 62 k

Ω (WORST CASE)

R2 = 8.2 k

Ω AT IOH = 100 µA

ITOTAL = 640 µA (TYPICAL)

R2

R2 =

0.8 V

IOH MAX

ITOTAL =

TOTAL DRIVE CURRENT USED:

+

VCC – VF – VOL

R1

VCC – VOL

R2

Figure 13. Recommended Parallel LED Driver Circuit for

HCPL-4701/-4731.

Figure 14. Recommended Alternative LED Driver Circuit for

HCPL-4701/-4731 .

4.7 µF

VCC

0.1 µF

+

R1

HCPL-47XX

ACTIVE OUTPUT

OR

OPEN COLLECTOR

*

R1 =

VCC – VF

IF

FOR VCC = 5 Vdc, IF = 40 µA

R1 = 91 k

Ω (TYPICAL)

R1 = 75 k

Ω (WORST CASE)

R1

HCPL-47XX

ACTIVE OUTPUT

*

R1 =

VOH – VF

IF

FOR VCC = 5 Vdc, IF = 40 µA

R1 = 36 k

Ω (TYPICAL)

R1 = 30 k

Ω (WORST CASE)

www.semiconductor.agilent.com

Data subject to change.

Copyright © 1999 Agilent Technologies

Obsoletes 5965-6116E

5968-1086E (11/99)