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HCPL-7800A Datasheet(PDF) 16 Page - Agilent(Hewlett-Packard) |
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HCPL-7800A Datasheet(HTML) 16 Page - Agilent(Hewlett-Packard) |
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16 / 17 page  1-231 Figure 28. HCPL-7800 Block Diagram. Figure 29. PC Board Trace Pattern and Loading Diagram Example. VOLTAGE REGULATOR CLOCK GENERATOR Σ∆ MODULATOR ENCODER LED DRIVE CIRCUIT DETECTOR CIRCUIT DECODER AND D/A FILTER ISO-AMP OUTPUT VOLTAGE REGULATOR ISO-AMP INPUT ISOLATION BOUNDARY conflicting considerations, therefore, must be weighed against each other in selecting an appropriate sense resistor for a particular application. To maintain circuit accuracy, it is recommended that the sense resistor and the isolation amplifier circuit be located as close as possible to one another. Although it is possible to buy current- sensing resistors from established vendors (e.g., the LVR-1, -3 and -5 resistors from Dale), it is also possible to make a sense resistor using a short piece of wire or even a trace on a PC board. Figures 30 and 31 illustrate the response of the overall isolation amplifier circuit shown in Figure 26. Figure 30 shows the response of the circuit to a ± 200 mV 20 kHz sine wave input and Figure 31 the response of the circuit to a ± 200 mV 20 kHz square wave input. Both figures demonstrate the fast, well-behaved response of the HCPL-7800. Figure 32 shows how quickly the isolation amplifier recovers from an overdrive condition generated by a 2 kHz square wave swinging between 0 and 500 mV (note that the time scale is different from the previous figures). The first wave form is the output of the application circuit with the filter capacitors removed to show the actual response of the isolation amplifier. The second wave form is the response of the same circuit with the capacitors installed. The recovery time and overshoot are relatively independent of the amplitude and polarity of the overdrive signal, as well as its duration. For more information, refer to Application Note 1059. |
Similar Part No. - HCPL-7800A |
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Similar Description - HCPL-7800A |
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