HCPL-3020-360E Avago Technologies US Inc., HCPL-3020-360E Datasheet - Page 13

• Manufacturer Part Number: HCPL-3020-360E
• Description: OPTOCOUPLER 1CH 0.4A VDE 8SMD GW
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-3020-360E

• Voltage - Isolation: 3750Vrms
• Number Of Channels: 1, Unidirectional
• Current - Output / Channel: 400mA
• Propagation Delay High - Low @ If: 200ns @ 7mA
• Current - Dc Forward (if): 20mA
• Input Type: DC
• Output Type: Push-Pull, Totem-Pole
• Mounting Type: Surface Mount, Gull Wing
• Package / Case: 8-SMD Gull Wing
• No. Of Channels: 1
• Optocoupler Output Type: Gate Drive
• Input Current: 12mA
• Output Voltage: 30V
• Opto Case Style: SMD
• No. Of Pins: 8
• Propagation Delay Low-high: 0.7µs
• Isolation Voltage: 3.75kV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LED Drive Circuit Considerations for Ultra High CMR
Performance
Without a detector shield, the dominant cause of optocou-
pler CMR failure is capacitive coupling from the input side
of the optocoupler, through the package, to the detector
IC as shown in Figure 19. The HCPL-3020 and HCPL-0302
improve CMR performance by using a detector IC with
an optically transparent Faraday shield, which diverts the
capacitively coupled current away from the sensitive IC
circuitry. However, this shield does not eliminate the ca-
pacitive coupling between the LED and optocoupler pins
5-8 as shown in Figure 20. This capacitive coupling causes
+5 V
Figure 19. Optocoupler input to output capacitance model for
unshielded optocouplers.
Figure 23. Recommended LED drive circuit for ultra-high CMR IPM
dead time and propagation delay specifications.
13
Figure 21. Equivalent circuit for figure 15 during common mode
1
2
3
4
+5 V
V
C
C
+
–
SAT
LEDN
LEDP
1
2
3
4
transient.
* THE ARROWS INDICATE THE DIRECTION
OF CURRENT FLOW DURING –dV
1
2
3
4
C
C
C
LEDP
LEDN
C
I
LEDP
LEDN
LEDP
SHIELD
SHIELD
V
+
CM
–
CM
/dt.
8
7
6
5
8
7
6
5
8
7
6
5
0.1
µF
+
–
Rg
V
CC
= 18 V
• • •
• • •
perturbations in the LED current during common mode
transients and becomes the major source of CMR failures
for a shielded optocoupler. The main design objective of
a high CMR LED drive circuit becomes keeping the LED in
the proper state (on or off ) during common mode tran-
sients. For example, the recommended application circuit
(Figure 17), can achieve 10 kV/µs CMR while minimizing
component complexity.
Techniques to keep the LED in the proper state are dis-
cussed in the next two sections.
Figure 22. Not recommended open collector drive circuit.
Figure 20. Optocoupler Input to output capacitance model for
shielded optocouplers.
1
2
3
4
+5 V
Q1
C
C
LEDN
LEDP
SHIELD
C
LEDO1
1
2
3
4
C
C
I
LEDN
LEDP
LEDN
C
SHIELD
LEDO2
8
7
6
5
8
7
6
5