HCPL-788J
Isolation Amplifier with Short Circuit and Overload Detection
Data Sheet
Lead (Pb) Free
RoHS 6 fully
compliant
RoHS 6 fully
compliant options available;
-xxxE
denotes a
lead-free
product
Description
Avago’s Isolation Amplifier with Short Circuit and Over-
load Detection makes motor phase current sensing com-
pact, affordable and easy-to-implement while satisfying
worldwide safety and regulatory requirements.
Features
x
Output Voltage Directly Compatible with A/D
Converters (0 V to V
REF
)
x
Fast (3 μs) Short Circuit Detection with Transient Fault
Rejection
x
Absolute Value Signal Output for Overload Detection
x
1 μV/°C Offset Change vs. Temperature
x
SO-16 Package
x
-40°C to +85°C Operating Temperature Range
x
25 kV/μs Isolation Transient Immunity
x
Regulatory Approvals: UL, CSA, IEC/EN/DIN EN 60747-
5-2 (1230 Vpeak Working Voltage)
Applications
x
Motor phase and rail current sensing
x
Power inverter current and voltage sensing
x
Industrial process control
x
Data acquisition systems
x
General purpose current and voltage sensing
x
Traditional current transducer replacements
Low Cost Three Phase Current Sensing with Short Circuit and Overload Detection
ISOLATION BOUNDARY
1
2
3
4
5
6
7
8
+5 V
V
IN+
V
IN-
FAULT
ABSVAL
V
OUT
V
REF
16
15
14
13
12
11
10
R
SENSE1
SHORT CIRCUIT FAULT
MICRO
CONTROLLER
HCPL-788J
9
ISOLATION BOUNDARY
1
2
3
4
5
6
7
A/D
CONVERTER
V
IN+
V
IN-
FAULT
ABSVAL
V
OUT
V
REF
16
15
14
13
12
11
10
R
SENSE2
V
REF
M
3 PHASE
MOTOR
8
HCPL-788J
9
ISOLATION BOUNDARY
1
2
3
4
5
6
7
8
3 PHASE ABSOLUTE
VALUE OUTPUT
V
IN+
V
IN-
FAULT
ABSVAL
V
OUT
V
REF
16
15
14
13
12
11
10
R
SENSE3
+
–
+
–
V
TH
OVERLOAD
FAULT
HCPL-788J
9
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.
Description
The HCPL-788J isolation ampli-fier is designed for cur-
rent sensing in electronic motor drives. In a typical
implementa-tion, motor currents flow through an ex-
ternal resistor and the resulting analog voltage drop is
sensed by the HCPL-788J. A larger analog output volt-
age is created on the other side of the HCPL-788J’s opti-
cal isolation barrier. The output voltage is proportional
to the motor current and can be connected directly to a
single-supply A/D converter. A digital over-range output
(FAULT) and an analog rectified output (ABSVAL) are also
provided. The wire OR-able over-range output (FAULT)
is useful for quick detection of short circuit conditions
on any of the motor phases. The wire-OR-able rectified
output (ABSVAL), simplifies measure-ment of motor load
since it performs polyphase rectification. Since the com-
mon-mode voltage swings several hundred volts in tens
of nanoseconds in modern electronic motor drives, the
HCPL-788J was designed to ignore very high common-
mode transient slew rates (10 kV/μs).
ISOLATION BOUNDARY
HCPL-788J
1
.01 μF
2
3
0.1 μF
4
ISOLATED +5 V
5
6
7
0.1 μF
8
GND
1
GND
2
9
GND
C
L
V
DD1
V
LED+
V
DD1
ABSVAL
V
OUT
V
REF
V
DD2
13
12
11
10
V
IN-
C
H
V
DD2
FAULT
15
4.7 kΩ
14
TO OTHER
PHASE
OUTPUTS
A/D
V
REF
V
IN+
GND
2
16
0.1 μF
μC
INPUT
CURRENT
+
R
SHUNT
0.02
Ω
39
Ω
+5 V
Figure 1. Current sensing circuit.
Pin Descriptions
Symbol
V
IN+
V
IN-
C
H
C
L
V
DD1
V
LED+
Description
Positive input voltage (±200 mV recommended).
Negative input voltage (normally connected to
GND
1
).
Internal Bias Node. Connections to or between C
H
and C
L
other than the required 0.1 μF capacitor
shown, are not recommended.
Supply voltage input (4.5 V to 5.5 V).
LED anode. This pin must be left unconnected for
guaranteed data sheet performance. (For optical
coupling testing only.)
Supply voltage input (4.5 V to 5.5 V).
Ground input.
Ground input.
Supply voltage input (4.5 V to 5.5 V).
Symbol
FAULT
Description
Short circuit fault output. FAULT changes from a
high to low output voltage within 6 μs after V
IN
exceeds the FAULT Detection Threshold. FAULT is an
open drain output which allows outputs from all
the HCPL-788Js in a circuit to be connected
together (“wired-OR”) forming a single fault signal
for interfacing directly to the micro-controller.
Absolute value of V
OUT
output. ABSVAL is 0 V
when V
IN
=0 and increases toward V
REF
as V
IN
approaches +256 mV or -256 mV. ABSVAL is
“wired-OR” able and is used for detecting
overloads.
Voltage output. Swings from 0 to V
REF
.
The nominal gain is V
REF
/504 mV.
Reference voltage input (4.0 V to V
DD2
). This
voltage establishes the full scale output ranges
and gains of V
OUT
and ABSVAL.
Supply voltage input (4.5 V to 5.5 V).
Ground input.
ABSVAL
V
DD1
GND
1
GND
2
V
DD2
V
OUT
V
REF
V
DD2
GND
2
2
Ordering Information
HCPL-788J is UL Recognized with 5000 Vrms for 1 minute per UL1577.
Option
Part
Number
HCPL-788J
RoHS
Compliant
-000E
-500E
non RoHS
Compliant
no option
#500
Package
SO-16
Surface
Mount
X
X
Tape
& Reel
X
IEC/EN/DIN EN
60747-5-2
X
X
Quantity
45 per tube
850 per reel
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 1:
HCPL-788J-500E to order product of 16-Lead Surface Mount package in Tape and Reel packaging with IEC/EN/DIN EN
60747-5-2 Safety Approval and RoHS compliant.
Example 2:
HCPL-788J to order product of 16-Lead Surface Mount package in Tube packaging and non RoHS compliant.
Option datasheets are available. Contact your Avago sales representative or authorized distributor for information.
Remarks: The notation ‘#XXX’ is used for existing products, while (new) products launched since July 15, 2001 and
RoHS compliant will use ‘–XXXE.’
Package Outline Drawings
16-Lead Surface Mount
0.018
(0.457)
16 15 14 13 12 11 10 9
0.050
(1.270)
LAND PATTERN RECOMMENDATION
TYPE NUMBER
DATE CODE
A 788J
YYWW
0.295 ± 0.010
(7.493 ± 0.254)
0.458 (11.63)
0.085 (2.16)
1
2
3
4
5
6
7
8
0.025 (0.64)
0.406 ± 0.10
(10.312 ± 0.254)
9°
0.345 ± 0.010
(8.986 ± 0.254)
ALL LEADS
TO BE
COPLANAR
± 0.002
0.018
(0.457)
0.138 ± 0.005
(3.505 ± 0.127)
0–8°
0.025 MIN.
0.408 ± 0.010
(10.160 ± 0.254)
0.008 ± 0.003
(0.203 ± 0.076)
STANDOFF
Dimensions in inches (millimeters)
Note: Initial and continued variation in the color of the HCPL-788J’s white mold compound is normal and does not affect device performance or
reliability.
Note: Floating lead protrusion is 0.25 mm (10 mils) max.
3
Package Characteristics
Parameter
Input-Output Momentary
Withstand Voltage
Resistance (Input-Output)
Capacitance (Input-Output)
Input IC Junction-to-Case
Thermal Resistance
Output IC Junction-to-Case
Thermal Resistance
Symbol
V
ISO
R
I-O
C
I-O
Tjci
Tjco
Min.
5000
Typ.
Max.
Units
Vrms
Test Conditions
RH < 50%, t = 1 min.,
T
A
= 25°C
V
I-O
= 500 V
DC
f = 1 MHz
T
A
= 85°C
T
A
= 85°C
Fig.
Notes
1,2,3
3
3
>10
9
1.3
120
100
Ω
pF
°C/W
°C/W
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 HCPL-788J has been approved 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
Recognized under UL 1577, component recognition
program, File E55361.
CSA
Approved under CSA Component Acceptance Notice
#5, File CA 88324.
4
IEC/EN/DIN EN 60747-5-2 Insulation Characteristics*
Description
Installation classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage ≤ 300 V
rms
for rated mains voltage ≤ 600 V
rms
for rated mains voltage ≤ 1000 V
rms
Climatic Classification
Pollution Degree (DIN VDE 0110/1.89)
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b**
V
IORM
x 1.875 = V
PR
, 100% Production Test with
tm = 1 sec, Partial discharge < 5 pC
Input to Output Test Voltage, Method a**
V
IORM
x 1.6 = V
PR
, Type and Sample Test, t
m
= 10 sec,
Partial discharge < 5 pC
Highest Allowable Overvoltage (Transient Overvoltage t
ini
= 60 sec)
Safety-limiting values — maximum values allowed in the
event of a failure, also see Figure 2.
Case Temperature
Input Power
Output Power
Insulation Resistance at T
SI
, V
IO
= 500 V
*
Symbol
Characteristic
I-IV
I-IV
I-III
55/85/21
2
Unit
V
IORM
V
PR
1230
2306
V
PEAK
V
PEAK
V
PR
1968
V
PEAK
V
IOTM
8000
V
PEAK
T
S
P
S1, INPUT
P
S1, OUTPUT
R
S
800
175
400
600
>10
9
°C
mW
mW
Ω
P
s
– POWER – mW
Isolation characteristics are guaranteed only within the safety maximum ratings which must
be ensured by protective circuits within the application. Surface Mount Classification is class
A in accordance with CECC00802.
** Refer to the optocoupler section of the isolation and Control Components Designer’s
Catalog, under Product Safety Regulations section IEC/EN/DIN EN 6747-5-2, for a detailed
description of Method a and Method b partial discharge test profiles.
P
si
– OUTPUT
P
si
– INPUT
600
400
200
0
0
25
50
75 100 125 150 175 200
T
S
– CASE TEMPERATURE – °C
Figure 2. Dependence of safety-limiting values on
temperature.
5
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