ACPL-790B-300E Datasheet, PDF (1/14 Pages) AVAGO TECHNOLOGIES LIMITED – Precision Isolation Amplifiers

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
I_DD1
VDD1 ₁
I_DD2
8 V_DD2
VIN+ 2
+
VIN- ₃
-
+
7 V_OUT+
-
6 V_OUT-
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.