參數(shù)資料
型號(hào)： HCPL-788J
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Isolation Amplifier with Short Circuit and Overload Detection(具有短路和過(guò)載保護(hù)功能的隔離放大器)
中文描述： 隔離放大器短路和過(guò)載檢測(cè)（具有短路和過(guò)載保護(hù)功能的隔離放大器）
文件頁(yè)數(shù)： 2/20頁(yè)
文件大小： 277K
代理商： HCPL-788J
2
Symbol
GND
2
V
DD2
FAULT
Description
Ground input.
Supply voltage input (4.5 V to 5.5 V).
Short circuit fault output. FAULT changes
from a high to low output voltage within
6
μ
s after V
IN
exceeds the FAULT Detec-
tion 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
OUT
V
REF
V
DD2
GND
2
Pin Descriptions
Symbol
V
IN+
Description
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
and C
L
other than the re-
quired 0.1
μ
F capacitor shown, are not
recommended.
C
L
V
DD1
Supply voltage input (4.5 V to 5.5 V).
V
LED+
LED anode. This pin must be left uncon-
nected for guaranteed data sheet perfor-
mance. (For optical coupling testing only.)
V
DD1
Supply voltage input (4.5 V to 5.5 V).
GND
1
Ground input.
Description
The HCPL-788J isolation amplifier
is 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
HCPL-788J. A larger analog
output voltage is created on the
other side of the HCPL-788J’s
optical 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 con-
Figure 1. Current Sensing Circuit.
ditions on any of the motor
phases. The wire-OR-able rectified
output (ABSVAL), simplifies
measurement of motor load since
it performs polyphase rectification.
Since the common-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/
μ
s).
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
GND
2
V
DD2
FAULT
ABSVAL
V
OUT
V
REF
V
DD2
GND
2
V
IN+
V
IN-
C
H
C
L
V
DD1
V
LED+
V
DD1
GND
1
R
SHUNT
ISOLATED +5 V
4.7 k
39
.01 μF
0.1 μF
0.1 μF
ISOLATION BOUNDARY
INPUT
CURRENT
+5 V
A/D
V
REF
GND
μC
TO OTHER
PHASE
OUTPUTS
+
0.1 μF
HCPL-788J
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HCPL-788J#500 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
HCPL-788J/EVAL 制造商:Avago Technologies 功能描述:
HCPL-788J-000E 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
HCPL-788J-500E 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube
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