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ACPL-C78A-000E

Miniature Isolation Amplifier

Description

The ACPL-C78A/C780/C784 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 ACPL-C78A/C780/C784. A differential output voltage is created on the other side of the ACPL-C78A/C780/C784 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 ACPL-C78A/C780/C784 was designed to ignore very high common-mode transient slew rates (of at least 10 kV/µs), which provides the precision and stability in high noise motor control environments.

The product can also be used for general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions. They are offered with gain tolerance of ±1% (ACPL-C78A), ±3% (ACPL-C780) and ±5% (ACPL-C784) to suit application need. The ACPL-C78A/C780/C784 utilizes sigma-delta 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, Stretched SO-8 (SSO-8) package (with 30% smaller footprint compared to the DIP-8 package) that meets 8 mm clearance and creepage requirements and worldwide regulatory safety standards.

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Lifecycle status:Active

Features

15 kV/µs Common-Mode Rejection at VCM = 1000 V
Compact, Auto-Insertable Stretched SO-8 Package
0.00025 V/V/°C Gain Drift vs. Temperature
0.3 mV Input Offset Voltage
100 kHz Bandwidth
0.004% Nonlinearity
Safety Approval (pending):
- UL 1577 (5000 Vrms/1 min.)
- CSA
- IEC/EN/DIN EN 60747-5-2
Advanced Sigma-Delta A/D Converter Technology
Fully Differential Amplifier
Options available are :
- 000E: Lead Free Option
- 060E: IEC/EN/DIN EN 60747-5-2 Option
- 500E: Tape and Reel Packaging Option

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

Benefits

The ACPL-C78A-000E isolation amplifier optocoupler was designed for current sensing in electric motor and automotive applications.Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the ACPL-C78A/C780/C784 was designed to ignore very high common-mode transient slew rates (of at least 10 kV/µs), which provides the precision and stability in high noise motor control environments.

Besides current sensing applicaions, this product can also be used for voltage sensing in motor control system and general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions.

The ACPL-C78A/C780/C784 is available in Stretched SO-8 (SSO-8) surface mount package (saves 30% PCB space compared to the DIP-8 package) that meets 8 mm clearance and creepage requirements, 5000 Vrms/1 min rating per UL 1577 and 1140 Vpeak working insulation voltage per IEC/EN/DIN EN 60747-5-2 safey standards.