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HCPL-7860 数据表(PDF) 14 Page - Agilent(Hewlett-Packard) |
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HCPL-7860 数据表(HTML) 14 Page - Agilent(Hewlett-Packard) |
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14 / 18 page  14 Figure 17. Recommended Application Circuit. + - MOTOR HV- HV+ R SENSE FLOATING POSITIVE SUPPLY GATE DRIVE CIRCUIT VDD1 VIN+ VIN- GND1 VDD2 MCLK MDAT GND2 CDAT SCLK CCLK VDD CLAT CHAN MCLK1 SDAT MDAT1 CS MCLK2 THR1 MDAT2 OVR1 GND RESET + 5 V HCPL-7860/ HCPL-786J TO CONTROL CIRCUIT C3 0.1 µF C1 0.1 µF C2 0.01 µF R2 39 Ω R1 D1 5.1 V HCPL-0872 Power Supplies and Bypassing The recommended application circuit is shown in Figure 17. A floating power supply (which in many applications could be the same supply that is used to drive the high-side power transistor) is regulated to 5 V using a simple zener diode (D1); the value of resistor R1 should be chosen to supply sufficient current from the existing floating supply. The voltage from the current sensing resistor or shunt (Rsense) is applied to the input of the HCPL-7860/ HCPL-786J (U2) through an RC anti-aliasing filter (R2 and C2). And finally, the output clock and data of the isolated modulator are connected to the digital interface IC. Although the application circuit is relatively simple, a few recommendations should be followed to ensure optimal performance. The power supply for the isolated modulator is most often obtained from the same supply used to power the power transistor gate drive circuit. If a dedicated supply is required, in many cases it is possible to add an additional winding on an existing transformer. Otherwise, some sort of simple isolated supply can be used, such as a line powered transformer or a high-frequency DC-DC converter. An inexpensive 78L05 three- terminal regulator can also be used to reduce the floating supply voltage to 5 V. To help attenuate high-frequency power supply noise or ripple, a resistor or inductor can be used in series with the input of the regulator to form a low- pass filter with the regulator’s input bypass capacitor. As shown in Figure 17, 0.1 µF bypass capacitors (C1 and C3) should be located as close as possible to the input and output power-supply pins of the isolated modulator (U2). The bypass capacitors are required because of the high- speed digital nature of the signals inside the isolated modulator. 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-frequency noise from aliasing down to lower frequencies and interfering with the input signal. |
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