HCPL-7800A Datasheet | Broadcom

Description The Broad® HCPL-7800A/HCPL-7800 (hereinafter referred to as HCPL-7800(A)), isolation amplifier family is 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 HCPL-7800(A). A differential output voltage is created on the other side of the HCPL-7800(A) 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 remended application circuit. Because mon-mode voltage swings of several hundred volts in tens of nanoseconds are mon in modern switching inverter motor drives, the HCPL-7800(A) is designed to ignore very high mon-mode transient slew rates (of at least 10 k V/µs). The high CMR capability of the HCPL-7800(A) isolation amplifier 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. The product can also be used for general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions. For general applications, use the HCPL-7800 (gain tolerance of ± 3%). For precision applications, use the HCPL-7800A with part-to-part gain tolerance of ± 1%. The HCPL-7800(A) uses 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 pact, auto-insertable, industry standard 8-pin DIP package that meets worldwide regulatory safety standards. (A gull-wing surface mount option #300 is also available). Features - 15 k V/µs...