HCPL-4731#320 Avago Technologies US Inc., HCPL-4731#320 Datasheet - Page 14

• Manufacturer Part Number: HCPL-4731#320
• Description: OPTOCOUPLER 2CH HS UL 8-SMD GW
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-4731#320

• Input Type: DC
• Package / Case: 8-SMD Gull Wing
• Voltage - Isolation: 5000Vrms
• Number Of Channels: 2, Unidirectional
• Current - Output / Channel: 60mA
• Data Rate: 100KBd
• Propagation Delay High - Low @ If: 65µs @ 40µA
• Current - Dc Forward (if): 5mA
• Output Type: Open Collector
• Mounting Type: Surface Mount, Gull Wing
• Isolation Voltage: 3750 Vrms
• Minimum Forward Diode Voltage: 1.1 V
• Output Device: Photodarlington
• Configuration: 2 Channel
• Current Transfer Ratio: 25000 %
• Maximum Baud Rate: 100 KBps
• Maximum Forward Diode Voltage: 1.4 V
• Maximum Reverse Diode Voltage: 2.5 V
• Maximum Input Diode Current: 10 mA
• Maximum Power Dissipation: 115 mW
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 1. Typical HCPL-4701 Power Dissipation for 3 V and 5 V Applications
Notes:
1. R
2. For typical total interface circuit power consumption in 3.3 Vdc application, add to P
Propagation Delay
When the HCPL-47XX optocoup-
ler is operated under very low
input and output current condi-
tions, the propagation delay times
will lengthen. When lower input
drive current level is used to
switch the high-efficiency AlGaAs
LED, the slower the charge and
discharge time will be for the
LED. Correspondingly, the propa-
gation delay times will become
longer as a result. In addition, the
split-Darlington (open-collector)
output amplifier needs a larger,
pull-up load resistance to ensure
the output current is within a
controllable range. Applications
that are not sensitive to longer
propagation delay times and that
are easily served by this HCPL-
47XX optocoupler, typically 65 s
or greater, are those of status
monitoring of a telephone line,
power line, battery condition of a
portable unit, etc. For faster
HCPL-47XX propagation delay
times, approximately 30 s, this
optocoupler needs to operate at
higher I
( 1 mA) levels.
14
(1,025 W for 500 A) LED current-limiting resistor, and 960 W for the 11 k
Vdc applications, add to P
W for the 11 k
L
Power Dissipation
of 11 k
F
P
( 500 A) and I
P
TOTAL
( W)
P
P
O-C
open-collector (o-c) pull-up resistor was used for both 3.3 Vdc and 5 Vdc calculations.
LED
Vcc
[1]
[2]
pull-up resistor power dissipations.
TOTAL
o
approximately 150 W for 40 A (1,875 W for 500 A) LED current-limiting resistor and 2,230
I
F
135 W
= 40 A
50
65
20
Applications
Battery-Operated Equipment
Common applications for the
HCPL-47XX optocoupler are
within battery-operated, portable
equipment, such as test or
medical instruments, computer
peripherals and accessories where
energy conservation is required to
maximize battery life. In these
applications, the optocoupler
would monitor the battery voltage
and provide an isolated output to
another electrical system to
indicate battery status or the need
to switch to a backup supply or
begin a safe shutdown of the
equipment via a communication
port. In addition, the HCPL-47XX
optocouplers are specified to
operate with 3 Vdc CMOS logic
family of devices to provide logic-
signal isolation between similar or
different logic circuit families.
Telephone Line Interfaces
Applications where the HCPL-
47XX optocoupler would be best
used are in telephone line inter-
face circuitry for functions of ring
detection, on-off hook detection,
line polarity, line presence and
V
CC
= 3.3 Vdc
I
F
965 W
= 500 A
625
330
10
pull-up resistor power dissipations. Similarly, for 5
TOTAL
I
supplied-power sensing. In
particular, Integrated Services
Digital Network (ISDN) applica-
tions, as illustrated in Figure 10,
can severely restrict the input
power that an optocoupler inter-
face circuit can use (approxi-
mately 3 mW). Figure 10 shows
three isolated signals that can be
served by the small input LED
current of the HCPL-47XX dual-
and single-channel optocouplers.
Very low, total power dissipation
occurs with these series of
devices.
Switched-Mode Power
Supplies
Within Switched-Mode Power
Supplies (SMPS) the less power
consumed the better. Isolation for
monitoring line power, regulation
status, for use within a feedback
path between primary and
secondary circuits or to external
circuits are common applications
for optocouplers. Low-power
HCPL-47XX optocoupler can help
keep higher energy conversion
efficiency for the SMPS. The block
diagram of Figure 11 shows where
low-power isolation can be used.
F
approximately 80 W for 40 A
175 W
= 40 A
100
50
25
V
CC
= 5 Vdc
I
F
1,145 W
= 500 A
625
500
20