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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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HCPL-788J500 Fiches technique(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HCPL-788J500 Fiches technique(HTML) 2 Page - Agilent(Hewlett-Packard) |
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2 / 20 page  2 Symbol Description GND2 Ground input. VDD2 Supply voltage input (4.5 V to 5.5 V). FAULT Short circuit fault output. FAULT changes from a high to low output voltage within 6 µs after V IN exceeds the FAULT Detec- tion 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 VOUT output. ABSVAL is 0 V when VIN=0 and increases toward VREF as VIN approaches +256 mV or -256 mV. ABSVAL is “wired-OR” able and is used for detecting overloads. VOUT Voltage output. Swings from 0 to VREF. The nominal gain is VREF /504 mV. VREF Reference voltage input (4.0 V to VDD2). This voltage establishes the full scale output ranges and gains of VOUT and ABSVAL. VDD2 Supply voltage input (4.5 V to 5.5 V). GND2 Ground input. Pin Descriptions Symbol Description VIN+ Positive input voltage ( ± 200 mV recommended). VIN- Negative input voltage (normally connected to GND1). CH Internal Bias Node. Connections to or between CH and CL other than the re- quired 0.1 µF capacitor shown, are not recommended. CL VDD1 Supply voltage input (4.5 V to 5.5 V). VLED+ LED anode. This pin must be left uncon- nected for guaranteed data sheet perfor- mance. (For optical coupling testing only.) VDD1 Supply voltage input (4.5 V to 5.5 V). GND1 Ground input. Description The HCPL-788J isolation amplifier 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-788J. A larger analog output voltage is created on the other side of the HCPL-788J’s optical 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 provided. The wire OR-able over-range output (FAULT) is useful for quick detection of short circuit con- Figure 1. Current Sensing Circuit. ditions on any of the motor phases. The wire-OR-able rectified output (ABSVAL), simplifies measurement of motor load since it performs polyphase rectification. Since the common-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 |
Numéro de pièce similaire - HCPL-788J500 |
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Description similaire - HCPL-788J500 |
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