HCPL-073A View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
'HCPL-073A' PDF : 17 Pages View PDF
10 V
VCM
0V
10%
tr
90% 90%
10%
tf
VO
SWITCH AT A: IF = 0 mA
VO
SWITCH AT B: IF = 0.5 mA
5V
VOL
IF
B
A
VFF
RCC (SEE NOTE 7)
1
8
+5 V
220 Ω
2
7
0.1 µF RL
3
6
VO
4
5
VCM
+–
PULSE GEN.
Figure 8. Test Circuit for Transient Immunity and Typical Waveforms.
IF
0
VO
(SATURATED
RESPONSE)
t PHL
1.5 V
5V
1.5 V
VOL
t PLH
Figure 9. Switching Test Circuit.
PULSE IF
GEN.
ZO = 50 Ω
tr = 5 ns
10% DUTY CYCLE
1/f < 100 µs
IF MONITOR
RM
1
8
+5 V
2
7
RL
3
6
VO
0.1 µF
4
5
* CL = 15 pF
* CL IS APPROXIMATELY 15 pF, WHICH INCLUDES
PROBE AND STRAY WIRING CAPACITANCE.
Applications Information
Low-Power Operation
Current Gain
There are many applications
where low-power isolation is
needed and can be provided by
the single-channel HCPL-4701, or
the dual-channel HCPL-4731 low-
power optocouplers. Either or
both of these two devices are
referred to in this text as HCPL-
47XX product(s). These opto-
couplers are Avago’s lowest input
current, low-power optocouplers.
Low-power isolation can be
defined as less than a milliwatt of
input power needed to operate
the LED of an optocoupler
(generally less than 500 µA). This
level of input forward current
conducting through the LED can
control a worst-case total output
(Iol) and power supply current
(Iccl) of two and a half
milliamperes. Typically, the
HCPL-47XX can control a total
output and supply current of 15
mA. The output current, IO is
determined by the LED forward
current multiplied by the current
gain of the optocoupler,
IO = IF (CTR)/100%. In particular
with the HCPL-47XX opto-
couplers, the LED can be driven
with a very small IF of 40 µA to
control a maximum IO of 320 µA
with a worst case design Current
Transfer Ratio (CTR) of 800%.
Typically, the CTR and the
corresponding Iol, are 4 times
larger. For low-power operation,
Table 1 lists the typical power
dissipations that occur for both
the 3.3 Vdc and 5 Vdc
HCPL-47XX optocoupler applica-
tions. These approximate power
dissipation values are listed
respectively for the LED, for the
output VCC and for the open-
collector output transistor. Those
values are summed together for a
comparison of total power dissi-
pation consumed in either the 3.3
Vdc or 5 Vdc applications.
13
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