ACPL-C87B

OptoCoupler 1-CH 8-Pin SO T/R

Isolated Voltage Sensor for

• BUS voltage sensing
• IGBT thermistor sensing

The ACPL-C87B voltage sensors is optical isolation amplifiers designed specifically for voltage sensing. Its 2 V 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 create don the other side of the optical isolation barrier. For general applications, the ACPL-C87A (±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. TheACPL-C87B/C87A/C870 family operates from a single 5 V supply and provides excellent linearity. An active-high shutdown pin is available which reduces the IDD1 current to only 15 mA, making them suitable for battery-powered and other power-sensitive applications. The high common-mode transient immunity (15 kV/µs)of the ACPL-C87B/C87A/C870 provides the precision and stability needed to accurately monitor DC-link voltage in high noise environments. Combined with superior optical coupling technology, the ACPL-C87B/C87A/C870 implements sigma-delta (S-D) 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.