The HCPL isolation amplifier family was 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 A differential output voltage is created on the other side of the HCPL optical isolation barrier. This differential output voltage is proportional to the motor current and can be converted to a single-ended signal by using an op-amp as shown in the recommended application circuit.
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Page The HCPL will continue to func-tion if more than long as the breakdown voltage limitations are observed. Input offset vs. Gain vs. Phase vs. HCPL fig 13 0. Nonlinearity vs. HCPL fig 0. Input current vs. HCPL fig 11 5. HV— Figure Recommended supply and sense resistor connections. As shown in Figure 18, 0. The bypass capacitors are required because of the high-speed digital nature of the signals inside the HCPL HCPL; this minimizes the loop area of the connection and reduces the possibility of stray mag- netic fields from interfering with the measured signal.
If the sense resistor is not located on the same PC board as the HCPL circuit, a tightly twisted pair of wires can accomplish the same thing. GND1 pin 4 , with the power-supply return path functioning as the sense line to the negative termi- nal of the current sense resistor. By referencing the input circuit to the negative side of the sense resistor, any load C at least pF works well.
Select the sense resistor so that it will have less than 5 V drop when short circuits occur Additional filtering using different filter R,C values in the post-amplifier application circuit can be used to improve the signal to noise ratio.
HCPL-7840 Avago Technologies US Inc., HCPL-7840 Datasheet
Page The HCPL will continue to func-tion if more than long as the breakdown voltage limitations are observed. Input offset vs. Gain vs. Phase vs.
HCPL-7840 View Datasheet(PDF) - Avago Technologies