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HCPL-788J датащи(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED

номер детали HCPL-788J
подробное описание детали  Isolation Amplifier with Short Circuit and Overload Detection SO-16 Package
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производитель  AVAGO [AVAGO TECHNOLOGIES LIMITED]
домашняя страница  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HCPL-788J датащи(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED

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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
Figure 1. Current sensing circuit.
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).
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
GND2
VDD2
FAULT
ABSVAL
VOUT
VREF
VDD2
GND2
VIN+
VIN-
CH
CL
VDD1
VLED+
VDD1
GND1
RSHUNT
0.02
Ω
ISOLATED +5 V
4.7 k
Ω
39
Ω
.01 μF
0.1 μF
0.1 μF
ISOLATION BOUNDARY
INPUT
CURRENT
+5 V
A/D
VREF
GND
μC
TO OTHER
PHASE
OUTPUTS
+
0.1 μF
HCPL-788J
Symbol
Description
FAULT
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.
ABSVAL
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.
V
OUT
Voltage output. Swings from 0 to V
REF
.
The nominal gain is V
REF
/504 mV.
V
REF
Reference voltage input (4.0 V to V
DD2
). This
voltage establishes the full scale output ranges
and gains of V
OUT
and ABSVAL.
V
DD2
Supply voltage input (4.5 V to 5.5 V).
GND
2
Ground input.
Symbol
Description
V
IN+
Positive input voltage (±200 mV recommended).
V
IN-
Negative input voltage (normally connected to
GND
1
).
C
H
Internal Bias Node. Connections to or between C
H
C
L
and C
L
other than the required 0.1 μF capacitor
shown, are not recommended.
V
DD1
Supply voltage input (4.5 V to 5.5 V).
V
LED+
LED anode. This pin must be left unconnected for
guaranteed data sheet performance. (For optical
coupling testing only.)
V
DD1
Supply voltage input (4.5 V to 5.5 V).
GND
1
Ground input.
GND
2
Ground input.
V
DD2
Supply voltage input (4.5 V to 5.5 V).
Pin Descriptions


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