ACPL-C78A, ACPL-C780, ACPL-C784 Miniature Isolation Amplifiers Data Sheet Description Features The ACPL-C78A/C780/C784 family of isolation ampli- 15 kV/s Common-Mode Rejection at V = 1000 V CM fiers is designed for current sensing in electronic motor Compact, Auto-Insertable Stretched SO-8 Package drives. In a typical implementation, motor currents flow 0.00025 V/V/C Gain Drift vs. Temperature through an external resistor and the resulting analog voltage drop is sensed by the ACPL-C78A/C780/C784. A 0.3 mV Input Oset ff Voltage differential output voltage is created on the other side of 100 kHz Bandwidth the ACPL-C78A/C780/C784 optical isolation barrier. This 0.004% Nonlinearity differential output voltage is proportional to the motor current and can be converted to a single-ended signal Worldwide Safety Approval: UL 1577 (5000 Vrms/1 min.), by using an op-amp as shown in the recommended ap- CSA and IEC/EN/DIN EN 60747-5-5 plication circuit. Since common-mode voltage swings Advanced Sigma-Delta (-) A/D Converter Technology of several hundred volts in tens of nanoseconds are Fully Differential Amplifier common in modern switching inverter motor drives, the ACPL-C78A/C780/C784 is designed to ignore very high Applications common-mode transient slew rates (of at least 10 kV/s). Motor Phase and Rail Current Sensing The high CMR capability of the ACPL-C78A/C780/C784 Inverter Current Sensing isolation amplifier provides the precision and stability needed to accurately monitor motor current in high noise DC bus voltage sensing motor control environments, providing for smoother General Purpose Current Sensing and Monitoring control (less torque ripple) in various types of motor General Purpose Analog Signal Isolation control applications. The product can also be used for general analog signal Functional Diagram isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions. For I I DD1 DD2 V DD1 8 V 1 DD2 general applications, we recommend the ACPL-C780 (gain tolerance of 3%) and the ACPL-C784 (gain tolerance of V IN+ 2 + 7 V OUT+ 5%). For precision applications Avago Technologies offers + the ACPL-C78A with part-to-part gain tolerance of 1%. - V IN- 3 - 6 V OUT- The ACPL-C78A/C780/C784 utilizes sigma-delta (-) an- alog-to-digital converter technology, chopper stabilized 4 GND1 5 GND2 amplifiers, and a fully differential circuit topology. SHIELD Together, these features deliver unequaled isolation- NOTE: A 0.1 F bypass capacitor must be connected between pins 1 and mode noise rejection, as well as excellent offset and gain 4 and between pins 5 and 8. accuracy and stability over time and temperature. This performance is delivered in a compact, auto-insertable, Stretched SO-8 (SSO-8) package that meets worldwide regulatory safety standards. 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. Pin Description Pin No. Symbol Description 1 V Supply voltage for input side (4.5 V to 5.5 V), relative to GND1 DD1 2 V Positive input ( 200 mV recommended) IN+ 3 V Negative input (normally connected to GND1) IN 4 GND1 Input side ground 5 GND2 Output side ground 6 V Negative output OUT 7 V Positive output OUT+ 8 V Supply voltage for output side (4.5 V to 5.5 V), relative to GND2 DD2 Ordering Information ACPL-C78A/C780/C784 is UL recognized with 5000 Vrms/1 minute rating per UL 1577. Option IEC/EN/DIN EN Part number (RoHS Compliant) Package Surface Mount Tape& Reel 60747-5-5 Quantity -000E X 80 per tube ACPL-C78A -060E X X 80 per tube Stretched ACPL-C780 SO-8 -500E X X 1000 per reel ACPL-C784 -560E X X X 1000 per reel To order, choose a part number from the part number column and combine with the desired option from the option column to form an order entry. Example: ACPL-C78A-560E to order product of Surface Mount package in Tape and Reel packaging with IEC/EN/DIN EN 60747-5-5 Safety Approval and RoHS compliance. Option datasheets are available. Contact your Avago sales representative or authorized distributor for information. 2