поискавой системы для электроныых деталей |
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HCPL-7520 датащи(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HCPL-7520 датащи(HTML) 11 Page - Agilent(Hewlett-Packard) |
11 / 15 page 11 As shown in Figure 17, 0.1 µF bypass capacitors (C1, C2) should be located as close as possible to the pins of the HCPL-7520. The bypass capacitors are required because of the high-speed digital nature of the signals inside the HCPL-7520. A 0.01 µF bypass capacitor (C2) is also recommended at the input due to the switched-capacitor nature of the input circuit. The input bypass capacitor also forms part of the anti-aliasing filter, which is recommended to prevent high frequencynoisefromaliasingdownto lower frequencies and interfering with the input signal. The input filter also performs an important reliability function—it reduces transient spikes from ESD events flowing through the current sensing resistor. PC Board Layout The design of the printed circuit board (PCB) should follow good layout practices, such as keeping bypass capacitors close to the supply pins, keeping output signals away from input signals, the use of ground and power planes, etc. In addition, the layout of the PCB can also affect the isolation transient immunity (CMTI) of the HCPL-7520, due primarily to stray capacitive coupling between the input and the output circuits. To obtain optimal CMTI performance, the layout of the PC board should minimize any stray coupling by maintaining the maximum possible distance between the input and output sides of the circuit and ensuring that any ground or power plane on the PC board does not pass directly below or extend much wider than the body of the HCPL-7520. Figure 17. Recommended HCPL-7520 application circuit. + - MOTOR HV- HV+ RSENSE FLOATING POSITIVE SUPPLY GATE DRIVE CIRCUIT HCPL-7520 C2 0.1 µF C3 0.01 µF R5 68 Ω R1 1 2 3 4 8 7 6 5 IN OUT C1 0.1 µF U1 78L05 C4 C5 C6 VDD1 VIN+ VIN- GND1 VDD2 VOUT VREF GND2 A/D VREF GND µC C6 = 150 pF C4 = C5 = 0.1 µF +5 V |
Аналогичный номер детали - HCPL-7520 |
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Аналогичное описание - HCPL-7520 |
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