Datasheet

Figure 15. Series LED Driver Circuit for HCPL-4701/-4731.
OUTPUT POWER – P
S
, INPUT CURRENT – I
S
0
0
T
S
– CASE TEMPERATURE – °C
20050
400
12525 75 100 150
600
800
200
100
300
500
700
P
S
(mW)
I
S
(mA)
175
Figure 16. Thermal Derating Curve,
Dependence of Safety Limiting Value with
Case Temperature per VDE 0884.
4.7 µF
V
CC
0.1 µF
+
R1
HCPL-47XX
ACTIVE OUTPUT
OR
OPEN COLLECTOR
R1 =
V
CC
– V
F
– V
OL
I
F
FOR V
CC
= 5 V dc , I
F
= 40 µA
R1 = 82 kΩ (TYPICAL)
R1 = 62 kΩ (WORST CASE)
R2 = 8.2 kΩ AT I
OH
= 100 µA
I
TOTAL
= 640 µA (TYPICAL)
R2
R2 =
0.8 V
I
OH MAX
I
TOTAL
=
TOTAL DRIVE CURRENT USED:
+
V
CC
– V
F
– V
OL
R1
V
CC
– V
OL
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
V
CC
0.1 µF
+
R1
HCPL-47XX
ACTIVE OUTPUT
OR
OPEN COLLECTOR
*
*
USE ANY STANDARD SCHOTTKY DIODE.
R1 =
V
CC
– V
F
I
F
FOR V
CC
= 5 Vdc, I
F
= 40 µA
R1 = 91 kΩ (TYPICAL)
R1 = 75 kΩ (WORST CASE)
R1
HCPL-47XX
ACTIVE OUTPUT
*
*
USE ANY SIGNAL DIODE.
R1 =
V
OH
– V
F
I
F
FOR V
CC
= 5 Vdc, I
F
= 40 µA
R1 = 36 kΩ (TYPICAL)
R1 = 30 kΩ (WORST CASE)
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Data subject to change. Copyright © 2007 Avago Technologies Limited. All rights reserved. Obsoletes 5989-2106EN
AV01-0547EN June 24, 2007