ACPL-061L-000E Avago Technologies US Inc., ACPL-061L-000E Datasheet - Page 14

• Manufacturer Part Number: ACPL-061L-000E
• Manufacturer: Avago Technologies US Inc.

Specifications of ACPL-061L-000E

• Number Of Elements: 1
• Input Type: DC
• Output Type: Totem Pole
• Forward Voltage: 1.7V
• Forward Current: 8mA
• Output Current: 10mA
• Isolation Voltage: 3750Vrms
• Operating Temp Range: -40C to 105C
• Pin Count: 8
• Mounting: Surface Mount
• Reverse Breakdown Voltage: 5V
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Compliant

Split LED Bias Resistor for Optimum CMR
Figure 11 shows the recommended drive circuit for the
ACPL-x6xL that gives optimum common-mode rejection.
The two current setting resistors balance the common
mode impedances at the LED’s anode and cathode.
Common-mode transients can capacitively couple from
the LED anode (or cathode) to the output-side ground
causing current to be shunted away from the LED (which
is not wanted when the LED should be on) or conversely
cause current to be injected into the LED (which is not
wanted when the LED should be off ).
Figure 12 shows the parasitic capacitances (C
C
ground. Also shown in Figure 12 on the input side is an
AC-equivalent circuit.
Table 1 shows the directions of I
polarity of the common-mode transient. For transients
occurring when the LED is on, common-mode rejection
(CM
LED current (I
For ACPL-M61L/W61L:
V
V
R
74LS04 or any
totem-pole output
logic gate
Figure 11. Recommended high-CMR drive circuit for the ACPL-x6xL.
14
DD
DD
T
LC
= R
) between the LED’s anode and cathode, and output
L
= 3.3 V: R
= 5.0 V: R
, since the output is at "low" state) depends on
1
+ R
V
DD
2
GND
R
1
1
F
1
1
). For conditions where I
= 510 : ± 1%, R
= 1000 : ± 1%, R
/R
2
≈ 1.5
2
LP
2
= 360 : ± 1%
= 680 : ± 1%
and I
LN
R
R
F
1
2
depend on the
is close to the
Shield
LA
and
switching threshold (I
to which I
any condition where a common-mode transient causes a
momentary decrease in I
> |I
failure for transients which are fast enough.
Likewise for a common-mode transient that occurs when
the LED is off (i.e. CM
if an imbalance between I
I
optocoupler, the transient “signal” may cause the output
to spike below 2 V, which constitutes a CM
The resistors recommended in Figure 11 include both
the output impedance of the logic driver circuit and
the external limiting resistor. The balanced I
resistors help equalize the common mode voltage change
at the anode and cathode. This reduces I
caused by transient coupling through the parasitic capaci-
tors C
For ACPL-061L/064L/K64L:
V
V
R
F
DD
DD
T
equal to or greater than the switching threshold of the
= R
FN
= 3.3 V: R
= 5.0 V: R
|, referring to Table 1). will cause a common-mode
LA
1
+ R
and C
LP
2
and I
1
1
R
LC
= 845 : ± 1%, R
1
= 430 : ± 1%, R
0.1PF
/R
shown in Figure 12.
LN
2
≈ 1
H
balance each other. In other words,
TH
, since the output is at "high" state),
), CM
F
LP
(i.e. when dV
L
and I
also depends on the extent
V
V
GND
2
2
DD2
O
= 845 : ± 1%
= 430 : ± 1%
2
LN
results in a transient
CM
/dt > 0 and |I
H
failure.
LED
LED
changes
-setting
FP
|