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HCPL-788J-500E Scheda tecnica(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-788J-500E Scheda tecnica(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
2 / 20 page 2 Description The HCPL-788J isolation ampli-fier is designed for cur- rent sensing in electronic motor drives. In a typical implementa-tion, motor currents flow through an ex- ternal resistor and the resulting analog voltage drop is sensed by the HCPL-788J. A larger analog output volt- age is created on the other side of the HCPL-788J’s opti- cal isolation barrier. The output voltage is proportional to the motor current and can be connected directly to a single-supply A/D converter. A digital over-range output (FAULT) and an analog rectified output (ABSVAL) are also Figure 1. Current sensing circuit. provided. The wire OR-able over-range output (FAULT) is useful for quick detection of short circuit conditions on any of the motor phases. The wire-OR-able rectified output (ABSVAL), simplifies measure-ment of motor load since it performs polyphase rectification. Since the com- mon-mode voltage swings several hundred volts in tens of nanoseconds in modern electronic motor drives, the HCPL-788J was designed to ignore very high common- mode transient slew rates (10 kV/μs). 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 GND2 VDD2 FAULT ABSVAL VOUT VREF VDD2 GND2 VIN+ VIN- CH CL VDD1 VLED+ VDD1 GND1 RSHUNT 0.02 Ω ISOLATED +5 V 4.7 k Ω 39 Ω .01 μF 0.1 μF 0.1 μF ISOLATION BOUNDARY INPUT CURRENT +5 V A/D VREF GND μC TO OTHER PHASE OUTPUTS + 0.1 μF HCPL-788J Symbol Description FAULT Short circuit fault output. FAULT changes from a high to low output voltage within 6 μs after V IN exceeds the FAULT Detection Threshold. FAULT is an open drain output which allows outputs from all the HCPL-788Js in a circuit to be connected together (“wired-OR”) forming a single fault signal for interfacing directly to the micro-controller. ABSVAL Absolute value of V OUT output. ABSVAL is 0 V when V IN =0 and increases toward V REF as V IN approaches +256 mV or -256 mV. ABSVAL is “wired-OR” able and is used for detecting overloads. V OUT Voltage output. Swings from 0 to V REF . The nominal gain is V REF /504 mV. V REF Reference voltage input (4.0 V to V DD2 ). This voltage establishes the full scale output ranges and gains of V OUT and ABSVAL. V DD2 Supply voltage input (4.5 V to 5.5 V). GND 2 Ground input. Symbol Description V IN+ Positive input voltage (±200 mV recommended). V IN- Negative input voltage (normally connected to GND 1 ). C H Internal Bias Node. Connections to or between C H C L and C L other than the required 0.1 μF capacitor shown, are not recommended. V DD1 Supply voltage input (4.5 V to 5.5 V). V LED+ LED anode. This pin must be left unconnected for guaranteed data sheet performance. (For optical coupling testing only.) V DD1 Supply voltage input (4.5 V to 5.5 V). GND 1 Ground input. GND 2 Ground input. V DD2 Supply voltage input (4.5 V to 5.5 V). Pin Descriptions |
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Descrizione simile - HCPL-788J-500E |
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