ACPL-C87A-500E

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1. Description

The Broadcom® ACPL-C87A-500E voltage sensors are optical isolation amplifiers designed specifically for voltage sensing. Its 2V input range and high 1-GΩ input impedance, makes it well suited for isolated voltage sensing requirements in electronic power converters applications, including motor drives and renewable energy systems. In a typical voltage sensing implementation, a resistive voltage divider is used to scale the DC-link voltage to suit the input range of the voltage sensor. A differential output voltage that is proportional to the input voltage is created on the other side of the optical isolation barrier. For general applications, the ACPL-C87A-500E (±1% gain tolerance) and the ACPL-C870 (±3% gain tolerance) are recommended. For high precision requirements, the ACPL-C87B (±0.5% gain tolerance) can be used. The ACPL-C87B/C87A/C870 family operates from a single 5V supply and provides excellent linearity. An active-high shutdown pin is available which reduces the IDD1 current to only 15A, making them suitable for battery-powered and other power-sensitive applications. The high common-mode transient immunity (15 kV/ms) of the ACPL-C87A-500E provides the precision and stability needed to accurately monitor DC-link voltage in high noise environments. Combined with superior optical coupling technology, the ACPL-C87A-500E implements sigma-delta (Σ-Δ) modulation, chopper stabilized amplifiers, and differential outputs to provide unequaled isolation-mode noise rejection, low offset, high gain accuracy and stability. This performance is delivered in a compact, auto-insertable Stretched SO-8 (SSO-8) package that meets worldwide regulatory safety standards.

2. Features

    1. Advanced sigma-delta (Σ-Δ) modulation technology

    2. Unity gain 1 V/V, ±0.5% high gain accuracy (ACPL-C87B)

    3. 1-GΩ input impedence

    4. 0 to 2V nominal input range

    5. –35 ppm/°C low gain frift

    6. 21 µV /°C offset voltage drift

    7. 0.1% non-linearity max

    8. Active-high shutdown pin

    9. 100-kHz wide bandwidth

  10. 3V to 5.5V wide supply range for output side

  11. –40°C to +105°C operating temperature range

  12. 15 kV/µs common-mode transient immunity

  13. Compact, auto-insertable stretched SO-8 package

  14. Safety and regulatory approvals:

        – IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working insulation voltage

        – UL 1577: 5000 Vrms/1 min double protection rating

        – CSA: Component Acceptance Notice #5

3. Applications

    1. Isolated voltage sensing in AC and servo motor drives

    2. Isolated DC-bus voltage sensing in solar inverters, wind turbine inverters

    3. Isolated sensor interfaces

    4. Signal isolation in data acquisition systems

    5. General purpose voltage isolation

4. Functional Diagram