ACPL-C78A, ACPL-C780, ACPL-C784
Miniature Isolation Amplifiers
Data Sheet
Description
The ACPL-C78A/C780/C784 isolation amplifier family was
designed for current sensing in electronic motor drives. In
a typical implementation, motor currents flow through an
external resistor and the resulting analog voltage drop is
sensed by the ACPL-C78A/C780/C784. A differential output
voltage is created on the other side of the ACPL-C78A/
C780/C784 optical isolation barrier. This differential output
voltage is proportional to the motor current and can be
converted to a single-ended signal by using an op-amp
as shown in the recommended application circuit. Since
common-mode voltage swings of several hundred volts
in tens of nanoseconds are common in modern switching
inverter motor drives, the ACPL-C78A/C780/C784 was
designed to ignore very high common-mode transient
slew rates (of at least 10 kV/μs).
The high CMR capability of the ACPL-C78A/C780/C784
isolation amplifier provides the precision and stability
needed to accurately monitor motor current in high noise
motor control environments, providing for smoother
control (less “torque ripple”) in various types of motor
control applications.
The product can also be used for general analog signal
isolation applications requiring high accuracy, stability,
and linearity under similarly severe noise conditions. For
general applications, we recommend the ACPL-C780 (gain
tolerance of ±3%) and the ACPL-C784 (gain tolerance of
±5%). For precision applications Avago Technologies offers
the ACPL-C78A with part-to-part gain tolerance of ±1%.
The ACPL-C78A/C780/C784 utilizes sigma-delta (∑-∆) an-
alog-to-digital converter technology, chopper stabilized
amplifiers, and a fully differential circuit topology.
Together, these features deliver unequaled isolation-
mode noise rejection, as well as excellent offset and gain
accuracy and stability over time and temperature. This
performance is delivered in a compact, auto-insertable,
Stretched SO-8 (SSO-8) package that meets worldwide
regulatory safety standards.
Features
•
15 kV/μs Common-Mode Rejection at V
CM
= 1000 V
•
Compact, Auto-Insertable Stretched SO-8 Package
•
0.00025 V/V/°C Gain Drift vs. Temperature
•
0.3 mV Input Offset Voltage
•
100 kHz Bandwidth
•
0.004% Nonlinearity
•
Worldwide Safety Approval: UL 1577 (5000 Vrms/1 min.),
CSA and IEC/EN/DIN EN 60747-5-2
•
Advanced Sigma-Delta (∑-∆) A/D Converter Technology
•
Fully Differential Amplifier
Applications
•
Motor Phase and Rail Current Sensing
•
Inverter Current Sensing
•
Switched Mode Power Supply Signal Isolation
•
General Purpose Current Sensing and Monitoring
•
General Purpose Analog Signal Isolation
Functional Diagram
V
DD1
1
V
IN+
2
V
IN-
3
GND1 4
I
DD1
+
-
SHIELD
I
DD2
8 V
DD2
7 V
OUT+
6 V
OUT-
5 GND2
+
-
NOTE: A 0.1
μF
bypass capacitor must be connected between pins 1 and
4 and between pins 5 and 8.
CAUTION:
It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD.
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Symbol
V
DD1
V
IN+
V
IN–
GND1
GND2
V
OUT–
V
OUT+
V
DD2
Description
Supply voltage for input side (4.5 V to 5.5 V), relative to GND1
Positive input (± 200 mV recommended)
Negative input (normally connected to GND1)
Input side ground
Output side ground
Negative output
Positive output
Supply voltage for output side (4.5 V to 5.5 V), relative to GND2
Ordering Information
ACPL-C78A/C780/C784 is UL recognized with 5000 Vrms/1 minute rating per UL 1577.
Part number
ACPL-C78A
ACPL-C780
ACPL-C784
Option
(RoHS Compliant)
-000E
-060E
-500E
-560E
Package
Stretched
SO-8
Surface Mount
X
X
X
X
Tape& Reel
IEC/EN/DIN EN
60747-5-2
X
Quantity
80 per tube
80 per tube
1000 per reel
1000 per reel
X
X
X
To order, choose a part number from the part number column and combine with the desired option from the option
column to form an order entry.
Example:
ACPL-C78A-560E to order product of Surface Mount package in Tape and Reel packaging with IEC/EN/DIN EN 60747-5-2
Safety Approval and RoHS compliance.
Option datasheets are available. Contact your Avago sales representative or authorized distributor for information.
2
Package Outline Drawings
Stretched SO-8 Package (SSO-8)
RECOMMENDED LAND PATTERN
5.850 ± 0.50
(0.230 ± 0.010)
PART NUMBER
8
7
6
5
DATE CODE
12.650 (0.5)
Z = OPTION CODE
[1]
RoHS-COMPLIANCE
INDICATOR
1
7°
C78A
Z
YYWW
2
3
4
6.807 ± 0.127
(0.268 ± 0.005)
1.905 (0.1)
1.590 ± 0.127
(0.063 ± 0.005)
3.180 ± 0.127
(0.125 ± 0.005)
0.450
(0.018)
45°
0.381 ± 0.130
(0.015 ± 0.005)
0.750 ± 0.250
(0.0295 ± 0.010)
1.270
(0.050) BSG
11.50 ± 0.250
(0.453 ± 0.010)
0.200 ± 0.100
(0.008 ± 0.004)
Dimensions in millimeters and (inches).
Lead coplanarity = 0.1 mm (0.004 inches).
Note 1: “V” = Options comprise 060; other options are not marked
Recommended Pb-Free IR Profile
Recommended reflow condition as per JEDEC Standard, J-STD-020 (latest revision). Non-Halide Flux should be used.
Regulatory Information
The ACPL-C78A/C780/C784 is pending for approvals by the following organizations:
IEC/EN/DIN EN 60747-5-2
Approved under:
IEC 60747-5-2:1997 + A1:2002
EN 60747-5-2:2001 + A1:2002
DIN EN 60747-5-2 (VDE 0884 Teil 2):2003-01.
UL
Approval under UL 1577, component recognition program
up to V
ISO
= 5000 Vrms. File E55361.
CSA
Approval under CSA Component Acceptance Notice #5,
File CA 88324.
3
Insulation and Safety Related Specifications
Parameter
Minimum External Air Gap
(External Clearance)
Minimum External Tracking
(External Creepage)
Minimum Internal Plastic Gap
(Internal Clearance)
Tracking Resistance
(Comparative Tracking Index)
Isolation Group
CTI
Symbol
L(101)
L(102)
Value
8.0
8.0
0.5
Units
mm
mm
mm
Conditions
Measured from input terminals to output terminals,
shortest distance through air
Measured from input terminals to output terminals,
shortest distance path along body
Through insulation distance, conductor to conductor,
usually the direct distance between the photoemitter and
photodetector inside the optocoupler cavity
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
>175
IIIa
V
IEC/EN/DIN EN 60747-5-2 Insulation Characteristics (Option 060)
[1]
Description
Installation classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage ≤ 150 Vrms
for rated mains voltage ≤ 300 Vrms
for rated mains voltage ≤ 450 V rms
for rated mains voltage ≤ 600 Vrms
for rated mains voltage ≤ 1000 Vrms
Climatic Classification
Pollution Degree (DIN VDE 0110/1.89)
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b
[2]
V
IORM
x 1.875 = V
PR
, 100% Production Test with t
m
= 1 sec,
Partial Discharge < 5 pC
Input to Output Test Voltage, Method a
[2]
V
IORM
x 1.5 = V
PR
, Type and Sample Test, t
m
= 60 sec,
Partial Discharge < 5 pC
Highest Allowable Overvoltage (Transient Overvoltage, t
ini
= 10 sec)
Safety-limiting values
(Maximum values allowed in the event of a failure)
Case Temperature
Input Current
[3]
Output Power
[3]
Insulation Resistance at T
S
, V
IO
= 500 V
V
IORM
V
PR
Symbol
Value
I-IV
I-IV
I-III
I-III
I-II
55/100/21
2
1140
2137
Units
Vpeak
Vpeak
V
PR
1710
Vpeak
V
IOTM
6000
Vpeak
T
S
I
S,INPUT
P
S,OUTPUT
R
S
175
230
600
≥ 10
9
°C
mA
mW
Ω
Notes:
1. Insulation characteristics are guaranteed only within the safety maximum ratings, which must be ensured by protective circuits within the
application.
2. Refer to the Isolation Circuits Regulatory Guide, Chapter 4 Synopsis of Key Regulatory Specifications, under IEC/EN/DIN EN 60747-5-2 Electrical
Safety Standard for Optoisolators section, for detailed description of Method a and Method b partial discharge test profiles.
3. Safety-limiting parameters are dependent on ambient temperature. The Input Current, I
S,INPUT
, derates linearly above 25°C free-air temperature at
a rate of 2.53 mA/°C; the Output Power, P
S,OUTPUT
, derates linearly above 25°C free-air temperature at a rate of 4 mW/°C.
4
Absolute Maximum Rating
Parameter
Storage Temperature
Ambient Operating Temperature
Supply Voltages
Steady-State Input Voltage
Two Second Transient Input Voltage
Output Voltages
Lead Solder Temperature
Notes:
1. Non-Halide Flux should be used.
Symbol
T
S
T
A
V
DD1
, V
DD2
V
IN+
, V
IN–
V
IN+
, V
IN–
V
OUT+
, V
OUT–
Min.
–55
–40
0
–2
–6
–0.5
Max.
+125
+100
5.5
V
DD1
+ 0.5
V
DD2
+ 0.5
Units
°C
°C
V
V
V
V
Note
260°C for 10 sec., 1.6 mm below seating plane
1
Recommended Operating Conditions
Parameter
Ambient Operating Temperature
Supply Voltages
Input Voltage (linear and accurate)
Input Voltage (functional)
Symbol
T
A
V
DD1
, V
DD2
V
IN+
, V
IN–
V
IN+
,
VIN–
Min.
–40
4.5
–200
–2
Max.
+85
5.5
+200
2
Units
°C
V
mV
V
Note
1
5
FPGA/CPLD
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