HCPL-788J Avago Technologies US Inc., HCPL-788J Datasheet - Page 2

• Manufacturer Part Number: HCPL-788J
• Description: OPTOCOUPLR AMP CURR SENSE 16SOIC
• Manufacturer: Avago Technologies US Inc.
• Series: -r
• Type: Current Sensorr

Specifications of HCPL-788J

• Package Type: SOIC
• Operating Supply Voltage (typ): 5V
• Voltage - Isolation: 3750Vrms
• Input Type: DC
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.295", 7.50mm Width)
• No. Of Amplifiers: 1
• Input Offset Voltage: 3mV
• Bandwidth: 30kHz
• Isolation Voltage: 3.75kV
• Supply Voltage Range: ± 4.5V To ± 5.5V
• Supply Current: 20mA
• Amplifier Case Style: SOIC
• No. Of Pins: 16
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Not Compliant

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
CURRENT
Figure 1. Current sensing circuit.
Pin Descriptions
Symbol
V
V
C
C
V
V
V
GND
GND
V
2
IN+
IN-
H
L
DD1
LED+
DD1
DD2
INPUT
1
2
R
SHUNT
0.02 Ω
Description
Positive input voltage (±200 mV recommended).
Negative input voltage (normally connected to
GND
Internal Bias Node. Connections to or between C
and C
shown, are not recommended.
Supply voltage input (4.5 V to 5.5 V).
LED anode. This pin must be left uncon nected for
guaranteed data sheet perfor mance. (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).
ISOLATED +5 V
+
1
).
L
other than the re quired 0.1 μF capacitor
39 Ω
.01 μF
0.1 μF
0.1 μF
1
2
3
4
5
6
7
8
V
V
C
C
V
V
V
GND
IN+
IN-
DD1
LED+
DD1
H
L
ISOLATION BOUNDARY
1
HCPL-788J
ABSVAL
H
FAULT
GND
GND
V
V
V
V
OUT
DD2
REF
DD2
2
2
provided. The wire OR-able over-range output (FAULT)
is useful for quick detec tion of short circuit con ditions
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).
Symbol
FAULT
ABSVAL
V
V
V
GND
16
15
14
13
12
11
10
9
OUT
REF
DD2
2
+5 V
0.1 μF
Description
Short circuit fault output. FAULT changes from a
high to low output voltage within 6 μs after V
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
when V
approaches +256 mV or -256 mV. ABSVAL is
“wired-OR” able and is used for detecting
overloads.
Voltage output. Swings from 0 to V
The nominal gain is V
Reference voltage input (4.0 V to V
voltage establishes the full scale output ranges
and gains of V
Supply voltage input (4.5 V to 5.5 V).
Ground input.
4.7 kΩ
TO OTHER
OUTPUTS
PHASE
IN
=0 and increases toward V
OUT
A/D
V
GND
REF
and ABSVAL.
μC
OUT
REF
output. ABSVAL is 0 V
/504 mV.
DD2
REF
REF
.
). This
as V
IN
IN