V
CC
V
– V
F
I
F
CC
+
R1 =
4.7 µF
0.1 µF
FOR V
CC
R1 = 91 kΩ (TYPICAL)
R1 = 75 kΩ (WORST CASE)
= 5 Vdc, I = 40 µA
F
V
– V
F
OH
I
R1 =
R1
F
*
FOR V
= 5 Vdc, I = 40 µA
CC
F
R1 = 36 kΩ (TYPICAL)
R1 = 30 kΩ (WORST CASE)
*
R1
HCPL-47XX
ACTIVE OUTPUT
OR
OPEN COLLECTOR
HCPL-47XX
ACTIVE OUTPUT
*
USE ANY SIGNAL DIODE.
*
USE ANY STANDARD SCHOTTKY DIODE.
Figure 13. Recommended Parallel LED Driver Circuit for
HCPL-4701/-4731.
Figure 14. Recommended Alternative LED Driver Circuit for
HCPL-4701/-4731 .
V
– V – V
F OL
CC
R1 =
R2 =
I
F
0.8 V
I
OH MAX
TOTAL DRIVE CURRENT USED:
V
– V – V
F
R1
V – V
CC OL
CC
OL
I
=
+
TOTAL
R2
V
FOR V
R1 = 82 kΩ (TYPICAL)
R1 = 62 kΩ (WORST CASE)
R2 = 8.2 kΩ AT I
= 5 Vdc, I = 40 µA
F
CC
CC
+
4.7 µF
0.1 µF
R2
R1
= 100 µA
= 640 µA (TYPICAL)
OH
I
TOTAL
HCPL-47XX
ACTIVE OUTPUT
OR
OPEN COLLECTOR
Figure 15. Series LED Driver Circuit for HCPL-4701/-4731.
800
P
(mW)
S
700
600
500
400
300
200
100
0
I
(mA)
S
0
25 50 75 100 125 150 175 200
– CASE TEMPERATURE – °C
T
S
www.semiconductor.agilent.com
Data subject to change.
Copyright © 1999 Agilent Technologies
Obsoletes 5965-6116E
Figure 16. Thermal Derating Curve,
Dependence of Safety Limiting Value
with Case Temperature per VDE 0884.
5968-1086E (11/99)
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
