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HCPL-7520 データシート(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-7520 データシート(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
11 / 16 page 11 Application Information Power Supplies and Bypassing The recommended supply connections are shown in Figure 16. A floating power supply (which in many ap- plications 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 R4 should be chosen to supply sufficient current from the existing floating supply. The voltage from the current sensing resistor (Rsense) is applied to the input of the HCPL-7520 through an RC anti-aliasing filter (R2 and C2). Although the application circuit is relatively simple, a few recom- mendations should be followed to ensure optimal performance. The power supply for the HCPL -7520 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 ad- ditional 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. Figure 16. Recommended supply and sense resistor connections. 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. + - MOTOR HV- HV+ RSENSE GATE DRIVE CIRCUIT VDD1 VIN+ VIN- GND1 HCPL-7520 C1 0.1 µF C2 0.01 µF R2 39 Ω R4 D1 5.1 V + - 1 2 3 4 R1 FLOATING POSITIVE SUPPLY |
同様の部品番号 - HCPL-7520 |
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同様の説明 - HCPL-7520 |
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