HCPL-788J

HCPL-788J 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 Output Voltage Directly Compatible with A/D Avagos Isolation Amplifier with Short Circuit and Over - Converters (0 V to V ) load Detection makes motor phase current sensing com- REF pact, affordable and easy-to-implement while satisfying Fast (3 s) Short Circuit Detection with Transient Fault 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 -40 C to +85 C 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 V Working Voltage) peak 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 ABSVAL 13 5 V 12 OUT MICRO V 6 REF 11 CONTROLLER 7 10 8 9 HCPL-788J ISOLATION BOUNDARY A/D CONVERTER 1 V 16 IN+ 2 V 15 IN- R SENSE2 3 14 FAULT 4 ABSVAL 13 5 V 12 OUT V 6 REF 11 V REF 7 10 8 9 M HCPL-788J 3 PHASE MOTOR ISOLATION BOUNDARY 3 PHASE ABSOLUTE VALUE OUTPUT 1 16 V IN+ 2 V 15 IN- R SENSE3 3 14 FAULT OVERLOAD 4 ABSVAL 13 + FAULT V 5 OUT 12 V 6 11 REF + 7 10 V TH 8 9 HCPL-788J 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 HCPL-788J isolation ampli-fier is designed for cur - provided. The wire OR-able over-range output (FAULT) rent sensing in electronic motor drives. In a typical is useful for quick detection of shor t circuit con ditions implementa-tion, motor currents flow through an ex - on any of the motor phases. The wire-OR-able rectified ternal resistor and the resulting analog voltage drop is output (ABSVAL), simplifies measure-ment of motor load sensed by the HCPL-788J. A larger analog output volt- since it performs polyphase rectification. Since the com - age is created on the other side of the HCPL-788Js opti- mon-mode voltage swings several hundred volts in tens cal isolation barrier. The output voltage is proportional of nanoseconds in modern electronic motor drives, the to the motor current and can be connected directly to a HCPL-788J was designed to ignore very high common- single-supply A/D converter. A digital over-range output mode transient slew rates (10 kV/s). (FAULT) and an analog rectified output (ABSVAL) are also ISOLATION BOUNDARY HCPL-788J 39 C INPUT + 1 V GND 16 IN+ 2 CURRENT R 0.01 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 ISOLATED +5 V A/D 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 V Negative input voltage (normally connected to IN IN- exceeds the FAULT Detection Threshold. FAULT is an GND ). 1 open drain output that allows outputs from all C Internal Bias Node. Connections to or between C H H the HCPL-788Js in a circuit to be connected and C other than the re quired 0.1 F capacitor L C together (wired-OR) forming a single fault signal L shown, are not recommended. for interfacing directly to the microcontroller. V Supply voltage input (4.5 V to 5.5 V). DD1 ABSVAL Absolute value of V output. ABSVAL is 0 V OUT V LED anode. This pin must be left uncon nected for LED+ when V =0 and increases toward V as V IN REF IN guaranteed data sheet perfor mance. (For optical approaches +256 mV or -256 mV. ABSVAL is coupling testing only.) wired-OR able and is used for detecting V Supply voltage input (4.5 V to 5.5 V). overloads. DD1 GND Ground input. V Voltage output. Swings from 0 to V . 1 OUT REF The nominal gain is V /504 mV. GND Ground input. REF 2 V Reference voltage input (4.0 V to V ). This V Supply voltage input (4.5 V to 5.5 V). REF DD2 DD2 voltage establishes the full scale output ranges and gains of V and ABSVAL. OUT V Supply voltage input (4.5 V to 5.5 V). DD2 GND Ground input. 2 2