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PDF ACPL-790A Data sheet ( Hoja de datos )
| Número de pieza | ACPL-790A | |
| Descripción | Precision Isolation Amplifiers | |
| Fabricantes | AVAGO | |
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ACPL-790B, ACPL-790A, ACPL-7900
Precision Isolation Amplifiers
Data Sheet
Description
The ACPL-790B/790A/7900 isolation amplifiers were
designed for current and voltage sensing in electronic
power converters in applications including motor drives
and renewable energy systems. In a typical motor drive
implementation, current flows through an external
resistor and the resulting analog voltage drop is sensed by
the isolation amplifier. A differential output voltage that is
proportional to the current is created on the other side of
the optical isolation barrier.
For general applications, the ACPL-790A (±1% gain
tolerance) and the ACPL-7900 (±3% gain tolerance)
are recommended. For high precision applications, the
ACPL-790B (±0.5% gain tolerance) can be used. The
product operates from a single 5 V supply and provides
excellent linearity and dynamic performance of 60 dB SNR.
With 200 kHz bandwidth, 1.6 Ps fast response time, the
product captures transients in short circuit and overload
conditions. The high common-mode transient immunity
(15 kV/Ps) of the ACPL-790B/790A/7900 provides the
precision and stability needed to accurately monitor
motor current in high noise motor control environments,
providing for smoother control (less “torque ripple”) in
various types of motor control applications.
Combined with superior optical coupling technology,
the ACPL-790B/790A/7900 implements sigma-delta (6-')
analog-to-digital converter, chopper stabilized ampli-
fiers, and a fully differential circuit topology to provide
unequaled isolation-mode noise rejection, low offset, high
gain accuracy and stability. This performance is delivered
in a compact, auto-insertable DIP-8 package that meets
worldwide regulatory safety standards.
Functional Diagram
Features
x ±0.5% High Gain Accuracy (ACPL-790B)
x -50 ppm/°C Low Gain Drift
x 0.6 mV Input Offset Voltage
x 0.05% Excellent Linearity
x 60 dB SNR
x 200 kHz Wide Bandwidth
x 3 V to 5.5 V Wide Supply Range for Output Side
x -40° C to +105° C Operating Temperature Range
x Advanced Sigma-Delta (¦') A/D Converter Technology
x Fully Differential Isolation Amplifier
x 15 kV/Ps Common-Mode Transient Immunity
x Compact, Auto-Insertable DIP-8 Package
x Safety and Regulatory Approvals (pending):
– IEC/EN/DIN EN 60747-5-5: 891 Vpeak working
insulation voltage
– UL 1577: 5000 Vrms/1 min double protection rating
– CSA: Component Acceptance Notice #5
Applications
x Current/Voltage Sensing in AC and Servo Motor Drives
x Solar Inverters, Wind Turbine Inverters
x Industrial Process Control
x Data Acquisition Systems
x Switching Power Supply Signal Isolation
x General Purpose Analog Signal Isolation
x Traditional Current Transducer Replacements
IDD1
VDD1 1
IDD2
8 VDD2
VIN+ 2
VIN- 3
+
-
+ 7 VOUT+
- 6 VOUT-
GND1 4
SHIELD
5 GND2
NOTE: A 0.1 PF bypass capacitor must be connected
between pins 1 and 4 and between pins 5 and 8.
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  
Table 4. IEC/EN/DIN EN 60747-5-5 Insulation Characteristics [1]
Description
Symbol
Value
Units
Installation classification per DIN VDE 0110/1.89, Table 1
for rated mains voltage ≤ 150 Vrms
for rated mains voltage ≤ 300 Vrms
for rated mains voltage ≤ 450 V rms
for rated mains voltage ≤ 600 Vrms
for rated mains voltage ≤ 1000 Vrms
I-IV
I-IV
I-III
I-III
I-II
Climatic Classification
55/105/21
Pollution Degree (DIN VDE 0110/1.89)
2
Maximum Working Insulation Voltage
VIORM
891
Vpeak
Input to Output Test Voltage, Method b
VIORM x 1.875 = VPR, 100% Production Test with tm = 1 sec,
Partial Discharge < 5 pC
VPR
1671
Vpeak
Input to Output Test Voltage, Method a
VIORM x 1.6 = VPR, Type and Sample Test, tm = 10 sec,
Partial Discharge < 5 pC
VPR
1426
Vpeak
Highest Allowable Overvoltage (Transient Overvoltage, tini = 60 sec)
VIOTM
8000
Vpeak
Safety-limiting values
(Maximum values allowed in the event of a failure)
Case Temperature
Input Current [2]
Output Power [2]
TS
IS,INPUT
PS,OUTPUT
175
400
600
°C
mA
mW
Insulation Resistance at TS, VIO = 500 V
RS
≥ 109
:
Notes:
1. Insulation characteristics are guaranteed only within the safety maximum ratings, which must be ensured by protective circuits within the
application.
2. Safety-limiting parameters are dependent on ambient temperature. The Input Current, IS,INPUT, derates linearly above 25° C free-air temperature at
a rate of 2.67 mA/°C; the Output Power, PS,OUTPUT, derates linearly above 25° C free-air temperature at a rate of 4 mW/°C.
Table 5. Absolute Maximum Rating
Parameter
Symbol
Min. Max.
Units
Storage Temperature
Ambient Operating Temperature
Supply Voltages
Steady-State Input Voltage [1, 3]
Two-Second Transient Input Voltage [2]
Output Voltages
TS
TA
VDD1, VDD2
VIN+, VIN–
VIN+, VIN–
VOUT+, VOUT–
-55
-40
-0.5
-2
-6
-0.5
+125
+105
6.0
VDD1 + 0.5
VDD1 + 0.5
VDD2 + 0.5
°C
°C
V
V
V
V
Lead Solder Temperature
260° C for 10 sec., 1.6 mm below seating plane
Notes:
1. DC voltage of up to -2 V on the inputs does not cause latch-up or damage to the device; tested at typical operating conditions.
2. Transient voltage of 2 seconds up to -6 V on the inputs does not cause latch-up or damage to the device; tested at typical operating conditions.
3. Absolute maximum DC current on the inputs = 100 mA, no latch-up or device damage occurs.
Table 6. Recommended Operating Conditions
Parameter
Symbol
Min. Max.
Ambient Operating Temperature
TA -40 +105
VDD1 Supply Voltage
VDD1
4.5 5.5
VDD2 Supply Voltage
VDD2
3 5.5
Input Voltage Range [1]
VIN+, VIN–
-200 +200
Notes:
1. ±200 mV is the nominal input range. Full scale input range (FSR) is ±300 mV. Functional input range is ±2 V.
Units
°C
V
V
mV
5
5 Page 
Definitions
Gain
Gain is defined as the slope of the best-fit line of differ-
ential output voltage (VOUT+ – VOUT–) vs. differential input
voltage (VIN+ – VIN–) over the nominal input range, with
offset error adjusted out.
Nonlinearity
Nonlinearity is defined as half of the peak-to-peak output
deviation from the best-fit gain line, expressed as a per-
centage of the full-scale differential output voltage.
Input DC Common Mode Rejection Ratio, CMRRIN
CMRRIN is defined as the ratio of the differential signal
gain (signal applied differentially between pins VOUT+ and
VOUT–) to the input side common-mode gain (input pins
tied together and the signal applied to both inputs with
respect to pin GND1), expressed in dB.
Common Mode Transient Immunity, CMTI, also known as
Common Mode Rejection
CMTI is tested by applying an exponentially rising/falling
voltage step on pin 4 (GND1) with respect to pin 5 (GND2).
The rise time of the test waveform is set to approximately
50 ns. The amplitude of the step is adjusted until the dif-
ferential output (VOUT+ – VOUT–) exhibits more than a 200
mV deviation from the average output voltage for more
than 1 Ps. The ACPL-790B/790A/7900 will continue to
function if more than 10 kV/Ps common mode slopes are
applied, as long as the breakdown voltage limitations are
observed.
Power Supply Rejection, PSR
PSR is the ratio of differential amplitude of the ripple
outputs over power supply ripple voltage, referred to the
input, expressed in dB.
Application Information
Application Circuit
The typical application circuit is shown in Figure 21. A
floating power supply (which in many applications could
be the same supply that is used to drive the high-side
power transistor) is regulated to 5 V using a simple three-
terminal voltage regulator (U1). The voltage from the
current sensing resistor, or shunt (RSENSE), is applied to
the input of the ACPL-790B/790A/7900 through an RC
anti-aliasing filter (R5 and C3). And finally, the differential
output of the isolation amplifier is converted to a ground-
referenced single-ended output voltage with a simple dif-
ferential amplifier circuit (U3 and associated components).
Although the application circuit is relatively simple, a few
recommendations should be followed to ensure optimal
performance.
POSITIVE
FLOATING
SUPPLY
HV+
GATE DRIVE
CIRCUIT
***
U1
78L05
IN OUT
VDD1
C1 C2 1
0.1 0.1
PF
R5 PF
2
10 C3
47 nF 3
U2
MOTOR + –
* * * RSENSE
GND1
***
4
ACPL-790B/
ACPL-790A/
ACPL-7900
HV-
Figure 21. Typical application circuit for motor phase current sensing.
C5
68 pF
R3
VDD2 (+5 V)
8 C4
10.0 K
+15 V
C8
0.1 PF
0.1 PF
7 R1
2.00 K
6 R2
GND2
–
U3
+ TL032A
2.00 K
5 C7
C6
68 pF
R4
10.0 K
0.1 PF
-15 V GND2
GND2 GND2
VOUT
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ACPL-790A.PDF ] | |
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