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PDF HCPL-7840 Data sheet ( Hoja de datos )
| Número de pieza | HCPL-7840 | |
| Descripción | Analog Isolation Amplifier | |
| Fabricantes | Agilent(Hewlett-Packard) | |
| Logotipo | .gif "Agilent(Hewlett-Packard)"){kind=logo} |
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Isolation Amplifier
Technical Data
HCPL-7840
Features
• 15 kV/µs Common-Mode
Rejection at VCM = 1000 V
• Compact, Auto-Insertable
Standard 8-pin DIP 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 (3750 Vrms/1 min.)
and CSA (pending), VDE
0884 (Option #060 only)
• Advanced Sigma-Delta (Σ−∆)
A/D Converter Technology
• Fully Differential Circuit
Topology
• 0.8 µm CMOS IC Technology
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
Description
The HCPL-7840 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
HCPL-7840. A differential output
voltage is created on the other
side of the HCPL-7840 optical
isolation barrier. This differential
output voltage is proportional to
the motor current and can be con-
verted 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 HCPL-7840
was designed to ignore very high
common-mode transient slew
rates (of at least 10 kV/µs).
The high CMR capability of the
HCPL-7840 isolation amplifier
provides the precision and
stability needed to accurately
monitor motor current in high
noise motor control environ-
ments, providing for smoother
control (less “torque ripple”) in
various types of motor control
applications.
Functional Diagram
IDD1
VDD1 1
IDD2
8 VDD2
VIN+ 2
+
+ 7 VOUT+
VIN– 3
–
– 6 VOUT–
GND1 4
SHIELD
5 GND2
The product can also be used for
general analog signal isolation
applications requiring high
accuracy, stability, and linearity
under similarly severe noise con-
ditions. For general applications,
we recommend the HCPL-7840
(gain tolerance of ± 5%). The
HCPL-7840 utilizes sigma delta
(∑-∆) analog-to-digital converter
technology, chopper stabilized
amplifiers, and a fully differential
circuit topology fabricated using
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.
1 page  
5
Insulation and Safety Related Specifications
Parameter
Symbol Value Unit
Minimum External Air Gap
(Clearance)
Minimum External Tracking
(Creepage)
Minimum Internal Plastic Gap
(Internal Clearance)
L(101)
L(102)
7.4
8.0
0.5
mm
mm
mm
Tracking Resistance
(Comparative Tracking Index)
Isolation Group
CTI
>175 Volts
III a
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 straight line distance
thickness between the emitter and detector.
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89,
Table 1)
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Supply Voltage
Steady-State Input Voltage
2 Second Transient Input Voltage
Output Voltage
Solder Reflow Temperature Profile
Symbol
TS
TA
VDD1, VDD2
VIN+, VIN-
VOUT
Min.
Max.
Unit Note
-55 125 °C
- 40 100
0 5.5 V
-2.0
-6.0
VDD1 +0.5
-0.5 VDD2 +0.5
See Package Outline Drawings Section
Recommended Operating Conditions
Parameter
Ambient Operating Temperature
Supply Voltage
Input Voltage (accurate and linear)
Input Voltage (functional)
Symbol
TA
VDD1, VDD2
VIN+, VIN-
VIN+, VIN-
Min.
-40
4.5
-200
-2
Max.
85
5.5
200
2
Unit
°C
V
mV
V
Note
1
5 Page 
11
10 K
VDD1
0.1 µF
VIN
0.01 µF
1
2
3
4
HCPL-7840
VDD2
8
0.1 µF
7 2K
6 2K
+15 V
0.1 µF
–
+ MC34081
5 0.1 µF
10 K
-15 V
VIN IMPEDANCE LESS THAN 10 Ω.
Figure 15. Propagation Delay Test Circuits.
VOUT
78L05
IN OUT
0.1 0.1
µF µF
9V
10 K
VDD2
150 pF
+15 V
18
0.1 µF
0.1 µF
27
HCPL-7840
36
2K
–
2 K + MC34081
45
PULSE GEN.
+–
VCM
10 K
150
pF
0.1 µF
-15 V
VOUT
Figure 16. CMTI Test Circuits.
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet HCPL-7840.PDF ] | |
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