ACPL-785J-000E

ACPL-785J Isolation Amplifier with Short Circuit and Overload Detection Data Sheet Lead (Pb) Free RoHS 6 fully compliant RoHS 6 fully compliant options available -xxxE denotes a lead-free product Description Features Avagos Isolation Amplifier with Short Circuit and Output Voltage Directly Compatible with A/D Overload Detection makes motor phase current sensing Converters (0 V to V ) REF compact, affordable and easy-to-implement while satis - Fast (3 s) Short Circuit Detection with Transient Fault fying worldwide safety and regulatory requirements. Rejection Absolute Value Signal Out put for Overload Detection Applications 1 V/C Oset Change vff s. Temperature Motor phase and rail current sensing SO-16 Package Power inverter current and voltage sensing -40C to +85C Operating Temperature Range Industrial process control 25 kV/s Isolation Transient Immunity Data acquisition systems Regulatory Approvals: UL, CSA, IEC/EN/DIN EN 60747- General purpose current and voltage sensing 5-5 (1414 Vpeak Working Voltage) Traditional current transducer replacements Low Cost Three Phase Current Sensing with Short Circuit and Overload Detection ISOLATION BOUNDARY +5 V 1 V 16 IN+ 2 15 V IN- SHORT CIRCUIT FAULT R SENSE1 3 14 FAULT 4 13 ABSVAL V 5 OUT 12 MICRO V 6 REF 11 CONTROLLER 7 10 8 9 ACPL-785J ISOLATION BOUNDARY A/D CONVERTER 1 V 16 IN+ 2 V 15 IN- R SENSE2 3 14 FAULT 4 13 ABSVAL V 5 OUT 12 V 6 REF 11 V REF 7 10 8 9 ACPL-785J M 3 PHASE MOTOR ISOLATION BOUNDARY 3 PHASE ABSOLUTE VALUE OUTPUT 1 V 16 IN+ 2 V 15 IN- R SENSE3 3 FAULT 14 OVERLOAD 4 13 + ABSVAL FAULT V 5 12 OUT V 6 REF 11 + 7 10 V TH 8 9 ACPL-785J 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. The components featured in this datasheet are not to be used in military or aerospace applications or environments.Description The ACPL-785J isolation amplifier is designed for current The wire OR-able over-range output (FAULT) is useful sensing in electronic motor drives. In a typical implemen- for quick detec tion of short circuit conditions on an y tation, motor currents flow through an external resistor of the motor phases. The wire-OR-able rectified output and the resulting analog voltage drop is sensed by the (ABSVAL), simplifies measure-ment of motor load since ACPL-785J. A larger analog output voltage is created it performs polyphase rectification. Since the common- on the other side of the ACPL-785Js optical isolation mode voltage swings several hundred volts in tens of barrier. The output voltage is proportional to the motor nanoseconds in modern electronic motor drives, the current and can be connected directly to a single-supply ACPL-785J was designed to ignore very high common- A/D converter. A digital over-range output (FAULT) and mode transient slew rates (10 kV/s). an analog rectified output (ABSVAL) are also provided. ISOLATION BOUNDARY ACPL-785J 39 C INPUT + 1 V GND 16 IN+ 2 CURRENT R .01 F 0.1 F SHUNT 0.02 2 V V 15 IN- DD2 4.7 k 3 C FAULT 14 H TO OTHER 0.1 F PHASE 4 C ABSVAL 13 L OUTPUTS A/D ISOLATED +5 V 5 V V 12 DD1 OUT V 6 V V 11 REF LED+ REF 7 V V 10 DD1 DD2 0.1 F 8 GND GND 9 GND 1 2 +5 V Figure 1. Current sensing circuit. Pin Descriptions Symbol Description Symbol Description V Positive input voltage (200 mV recommended). FAULT Short circuit fault output. FAULT changes from a IN+ high to low output voltage within 6 s after V Negative input voltage (normally connected to IN- V exceeds the FAULT Detection Threshold. FAULT IN GND ). 1 is an open drain output which allows outputs from all the ACPL-785Js in a circuit to be connected C Internal Bias Node. Connections to or between C H H and C other than the re quired 0.1 F capacitor together (wired-OR) forming a single fault signal L C L shown, are not recommended. for interfacing directly to the micro-controller. V Supply voltage input (4.5 V to 5.5 V). ABSVAL Absolute value of V output. ABSVAL is 0 V DD1 OUT when V =0 and increases toward V as V IN REF IN V LED anode. This pin must be left uncon nected for LED+ approaches +256 mV or -256 mV. ABSVAL is guaranteed data sheet perfor mance. (For optical wired-OR able and is used for detecting coupling testing only.) overloads. V Supply voltage input (4.5 V to 5.5 V). DD1 V Voltage output. Swings from 0 to V . OUT REF The nominal gain is V /504 mV. GND Ground input. REF 1 V Reference voltage input (4.0 V to V ). This GND Ground input. REF DD2 2 voltage establishes the full scale output ranges V Supply voltage input (4.5 V to 5.5 V). DD2 and gains of V and ABSVAL. OUT V Supply voltage input (4.5 V to 5.5 V). DD2 GND Ground input. 2 2