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HCPL-7840-500E Datasheet(PDF) 14 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-7840-500E Datasheet(HTML) 14 Page - AVAGO TECHNOLOGIES LIMITED |
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14 / 19 page  14 Application Information Power Supplies and Bypassing The recommended supply con-nections are 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 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-7840 through an RC anti-aliasing filter (R2 and C2). Although the application circuit is relatively simple, a few recommendations should be followed to ensure optimal performance. The power supply for the HCPL -7840 is most often ob- tained from the same supply used to power the power transistor gate drive circuit. If a dedicated supply is re- quired, 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. Figure 17. Recommended supply and sense resistor connections. HCPL-7840 C1 0.1 µF R2 39 Ω GATE DRIVE CIRCUIT FLOATING POWER SUPPLY • • • HV+ • • • HV– • • • – + RSENSE MOTOR C2 0.01 µF D1 5.1 V – + R1 |
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