Current Sensing Using Broadcom HCPL-786J-000E Optically Isolated Modulator in Power Inverter Systems
Product Overview
The HCPL-7860/HCPL-786J Optically Isolated Modulator, when paired with the HCPL-0872 Digital Interface IC or a digital filter, forms a two-chip isolated programmable analog-to-digital converter. This system is designed for direct measurement of motor phase currents in power inverters. The HCPL-7860/HCPL-786J utilizes Sigma-Delta () over-sampling modulation to convert a low-bandwidth analog input into a high-speed one-bit data stream, offering high noise margins and excellent immunity to isolation-mode transients. The data and clock are transmitted across an isolation boundary for recovery and decoding. Key applications include motor phase and rail current sensing, data acquisition systems, industrial process control, and general-purpose current sensing and monitoring.
Product Attributes
- Brand: Avago Technologies
- Compliance: Lead (Pb) Free, RoHS 6 fully compliant options available.
- Certifications: UL 1577, CSA, IEC/EN/DIN EN 60747-5-5
- Safety Approvals: UL Recognized (HCPL-7860: 3750 Vrms, HCPL-786J: 5000 Vrms)
- Handling Precautions: Normal static precautions advised.
- Application Restrictions: Not for military or aerospace applications.
Technical Specifications
| Feature/Model | HCPL-7860 | HCPL-786J | Unit | Conditions |
|---|---|---|---|---|
| Linearity | 12-bit | - | - | |
| Conversion Time (Pre-Trigger Mode 2 with HCPL-0872) | 200 | ns | - | |
| Effective Resolution (5 s Signal Delay) | 12-bit | - | (14-bit with 102 s) | |
| Fast Over-Range Detection (with HCPL-0872) | 3 | s | - | |
| Input Range | 200 | mV | Single 5 V Supply | |
| Internal Reference Voltage Matching | 1 | % | - | |
| Operating Temperature Range | -40 to +85 | C | - | |
| Isolation Transient Immunity | 15 | kV/s | - | |
| Supply Voltage (VDD1, VDD2) | 4.5 to 5.5 | V | - | |
| Input Supply Current (IDD1) | 10-15 | mA | VIN+ = -350 mV to +350 mV | |
| Output Supply Current (IDD2) | 10-15 | mA | - | |
| Output Clock Frequency (fCLK) | 8.2-13.2 | MHz | - | |
| Integral Nonlinearity (INL) | 0.01-0.14 | % | - | |
| Signal-to-Noise Ratio (SNR) | 62-73 | dB | VIN+ = 35 Hz, 400 mVpk-pk (141 mVrms) sine wave | |
| Signal Delay (tDSIG) | 19-23 | s | - | |
| Signal Bandwidth (BW) | 18-22 | kHz | - | |
| Input-Output Momentary Withstand Voltage (VISO) | 3750 | 5000 | Vrms | RH 50%, t = 1 min; TA = 25C |
| Input-Output Resistance (RI-O) | 1012-1013 | VI-O = 500 Vdc | ||
| Input-Output Capacitance (CI-O) | 1.4 | pF | f = 1 MHz | |
| Package Type | DIP-8, Gull Wing Surface Mount | SO-16 | - | - |
| Ordering Option (RoHS Compliant) | -000E, -300E, -500E | -000E, -500E | - | - |
2410121758_Broadcom-HCPL-786J-000E_C191647.pdf
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