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HCPL-7840 데이터시트(PDF) 1 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-7840 데이터시트(HTML) 1 Page - AVAGO TECHNOLOGIES LIMITED |
1 / 19 page Description The HCPL-7840 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 HCPL-7840. A differential output voltage is created on the other side of the HCPL-7840 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 HCPL-7840 was designed to ignore very high common- mode transient slew rates (of at least 10 kV/µs). The high CMR capability of the HCPL-7840 isolation amplifier provides the precision and stability needed to accurately monitor motor current in high noise motor control environ-ments, 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 con-ditions. For general applications, we recommend the HCPL-7840 (gain tolerance of ± 5%). The HCPL-7840 utilizes sigma delta (∑-∆) analog-to-digital converter technology, chopper stabilized amplifiers, and a fully differential circuit topol- ogy fabricated using Avago’s 0.8 µm CMOS IC process. 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, industry standard 8-pin DIP package that meets world- wide regulatory safety standards. (A gull-wing surface mount option #300 is also available). 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. 1 2 3 4 8 7 6 5 HCPL-7840 functional diag. IDD1 VDD1 VIN+ VIN– GND1 IDD2 VDD2 VOUT+ VOUT– GND2 + – + – SHIELD HCPL-7840 Isolation Amplifier Data Sheet Features • 15 kV/µs common-mode rejection at V CM = 1000 V • Compact, auto-insertable standard 8-pin DIP package • 0.00025 V/V/°C gain drift vs. temperature • 0.3 mV input offset voltage • 100 kHz bandwidth • 0.004% nonlinearity • Worldwide safety approval: UL 1577 (3750 Vrms/1 min.) and CSA, IEC/EN/DIN EN 60747-5-2 (Option #060 only) • Advanced Sigma-Delta (∑-∆) A/D converter technol- ogy • Fully differential circuit topology • 0.8 µm CMOS IC technology 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 Functional Diagram A 0.1 µF bypass capacitor must be connected between pins 1 and 4 and between pins 5 and 8. Lead (Pb) Free RoHS 6 fully compliant RoHS 6 fully compliant options available; -xxxE denotes a lead-free product |
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