Agilent HCPL-7800A/HCPL-7800
Isolation Amplifier
Data Sheet
Features
• 15 kV/µs Common-Mode Rejec-
tion at V
CM
= 1000 V
• Compact, Auto-Insertable Stan-
dard 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,
IEC/EN/DIN EN 60747-5-2
• Advanced Sigma-Delta (Σ−∆)
A/D Converter Technology
• Fully Differential Circuit Topology
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
Functional Diagram
V
DD1
V
IN+
V
IN-
I
DD1
1
2
3
Description
The HCPL-7800(A) 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-7800(A). A differential
output voltage is created on the
other side of the HCPL-7800(A)
optical isolation barrier. This
differential output voltage is
proportional to the motor
current and can be converted 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-7800(A) was
designed to ignore very high
common-mode transient slew
rates (of at least 10 kV/µs).
The high CMR capability of the
HCPL-7800(A) 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.
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-7800 (gain tolerance of
±3%). For precision applications
Agilent offers the HCPL-7800A
with part-to-part gain tolerance
of ±1%. The HCPL-7800(A)
utilizes sigma delta (
Σ−∆
)
analog-to-digital converter
technology, chopper stabilized
amplifiers, and a fully
differential circuit topology.
Together, these features
deliver unequaled isolation-
mode noise rejection, as well
as excellent offset and gain
accuracy and stability over
time and temperature. This
performance is delivered in a
compact, auto-insertable,
industry standard 8-pin DIP
package that meets worldwide
regulatory safety standards.
(A gull-wing surface mount
option #300 is also available).
I
DD2
8
V
DD2
+
-
+
-
7
V
OUT+
6
V
OUT-
5
GND2
GND1
4
SHIELD
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.
Regulatory Information
The HCPL-7800(A) 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
Approved under UL 1577, component
recognition program up to V
ISO
= 3750 Vrms.
CSA
Approved under CSA Component Acceptance
IEC/EN/DIN EN 60747-5-2 Insulation Characteristics
[1]
Description
Installation classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage -300 Vrms
for rated mains voltage -450 Vrms
for rated mains voltage -600 Vrms
Climatic Classification
Pollution Degree (DIN VDE 0110/1.89)
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b
[2]
V
IORM
x 1.875 = V
PR,
100% Production Test with
t
m
= 1 sec, Partial discharge < 5 pC
Input to Output Test Voltage, Method a
[2]
V
IORM
x 1.5 = V
PR,
Type and Sample Test,
t
m
= 60 sec, Partial discharge < 5 pC
Highest Allowable Overvoltage
(Transient Overvoltage t
ini
= 10 sec)
Safety-limiting values—maximum values
allowed in the event of a failure.
Case Temperature
Input Current
[3]
Output Power
[3]
Insulation Resistance at T
S
, V
IO
= 500 V
Symbol
Characteristic
I-IV
I-III
I-II
55/100/21
2
Unit
V
IORM
V
PR
891
1670
V
PEAK
V
PEAK
V
PR
V
IOTM
1336
6000
V
PEAK
V
PEAK
T
S
I
S,INPUT
P
S,OUTPUT
R
S
175
400
600
>10
9
°C
mA
mW
Ω
OUTPUT POWER - P
S
, INPUT CURRENT - I
S
Notes:
1. Insulation 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.
2. Refer to the optocoupler section of the Isolation and Control Components Designer’s Catalog,
under Product Safety Regulations section, (IEC/EN/DIN EN 60747-5-2) for a detailed description
of Method a and Method b partial discharge test profiles.
3. Refer to the following figure for dependence of PS and IS on ambient temperature.
800
700
600
500
400
300
200
100
0
0
25
50
75
100
125
150
o
P S (mW)
I S (mA)
175
200
T
A
- CASE TEMPERATURE - C
5
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