HCPL-3120#500 Avago Technologies US Inc., HCPL-3120#500 Datasheet - Page 21
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HCPL-3120#500
Manufacturer Part Number
HCPL-3120#500
Description
OPTOCOUPLER 1CH 2.5A 8-SMD
Manufacturer
Avago Technologies US Inc.
Datasheet
1.HCPL-3120-500E.pdf
(24 pages)
Specifications of HCPL-3120#500
Output Type
Gate Driver
Package / Case
8-SMD Gull Wing
Voltage - Isolation
3750Vrms
Number Of Channels
1, Unidirectional
Current - Output / Channel
2.5A
Propagation Delay High - Low @ If
300ns @ 7mA ~ 16mA
Current - Dc Forward (if)
25mA
Input Type
DC
Mounting Type
Surface Mount, Gull Wing
Configuration
1 Channel
Isolation Voltage
3750 Vrms
Maximum Propagation Delay Time
500 ns
Maximum Forward Diode Voltage
1.8 V
Minimum Forward Diode Voltage
1.2 V
Maximum Reverse Diode Voltage
5 V
Maximum Forward Diode Current
16 mA
Maximum Power Dissipation
295 mW
Maximum Operating Temperature
+ 100 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number
Manufacturer
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Price
θ
LED Drive Circuit Considerations for Ultra High CMR Per-
formance. (Discussion applies to HCPL-3120, HCPL-J312,
and HCNW3120)
Without a detector shield, the dominant cause of op-
tocoupler CMR failure is capacitive coupling from the
input side of the optocoupler, through the package, to
the detector IC as shown in Figure 29. The HCPL-3120
improves CMR perform-ance 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 30. This capacitive coupling causes
Figure 28. Thermal model.
Figure 29. Optocoupler input to output capacitance model for unshielded
optocouplers.
21
LC
1
2
3
4
= 467 °C/W
C
C
LEDP
LEDN
HCPL-3120 fig 29
T
JE
θ
LD
= 442 °C/W
T
C
θ
CA
T
A
= 83 °C/W*
θ
T
DC
JD
= 126 °C/W
8
7
6
5
HCPL-3120 fig 28
T
T
T
q
q
q
q
*q
DC
LD
CA
JD
LC
JE
C
CA
= LED junction temperature
= detector IC junction temperature
= case temperature measured at the center of the package bottom
= LED-to-case thermal resistance
= LED-to-detector thermal resistance
= detector-to-case thermal resistance
= case-to-ambient thermal resistance
*θ
θ
θ
θ
θ
T
T
T
LC
LD
DC
CA
CA
will depend on the board design and the placement of the part.
JE
JD
C
= CASE TEMPERATURE MEASURED AT THE
= LED JUNCTION TEMPERATURE
= DETECTOR IC JUNCTION TEMPERATURE
= LED-TO-CASE THERMAL RESISTANCE
= LED-TO-DETECTOR THERMAL RESISTANCE
= DETECTOR-TO-CASE THERMAL RESISTANCE
= CASE-TO-AMBIENT THERMAL RESISTANCE
WILL DEPEND ON THE BOARD DESIGN AND
THE PLACEMENT OF THE PART.
CENTER OF THE PACKAGE BOTTOM
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
transients. For example, the recommended application
circuit (Figure 25), can achieve 25 kV/µs CMR while mini-
mizing component complexity.
Techniques to keep the LED in the proper state are
discussed in the next two sections.
Figure 30. Optocoupler input to output capacitance model for shielded
optocouplers.
1
2
3
4
C
C
LEDP
LEDN
HCPL-3120 fig 30
C
SHIELD
LEDO1
C
LEDO2
8
7
6
5