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HCPL-576X 데이터시트(PDF) 9 Page - Broadcom Corporation. |
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HCPL-576X 데이터시트(HTML) 9 Page - Broadcom Corporation. |
9 / 11 page Broadcom - 9 - HCPL-576x, 5962-8947701 Data Sheet Electrical Considerations The HCPL-5760, HCPL-5761, HCPL-576K, or 5962-89477 optocoupler has internal temperature-compensated, predictable voltage and current threshold points that allow selection of an external resistor, Rx, to determine larger external threshold voltage levels. For a desired external threshold voltage, V±, a corresponding typical value of Rx can be obtained from Figure 10. Specific calculation of Rx can be obtained from Equation 1 of Figure 11. Specification of both V+ and V– voltage threshold levels simultaneously can be obtained by the use of Rx and Rp as shown in Figure 11 and determined by Equations 2 and 3. Rx can provide overcurrent transient protection by limiting input current during a transient condition. For monitoring contacts with a relay or switch, the HCPL-5760/1/K, or 5962-89477 combination with Rx and Rp can be used to allow a specific current to be conducted through the contacts for cleaning purposes (wetting current). The choice of which input voltage clamp level to choose depends upon the application of this device (see Figure 3). It is recommended that the low clamp condition be used when possible to lower the input power dissipation as well as the LED current, which minimizes LED degradation over time. In applications where dVCM/dt might be extremely large (such as static discharge), a series resistor, RCC, should be connected in series with VCC and Pin 8 to protect the detector IC from destructively high surge currents.1 In addition, it is recommended that a ceramic disc bypass capacitor of 0.01 μF to 0.1 μF be placed between Pins 8 and 5 to reduce the effect of power supply noise. For interfacing ac signals to TTL systems, output low-pass filtering can be performed with a pull-up resistor of 1.5 kΩ and 20 μF capacitor. This application requires a Schmitt trigger gate to avoid slow rise time chatter problems. For ac input applica tions, a filter capacitor can be placed across the dc input terminals for either signal or transient filtering. Either AC (Pins 1, 4) or DC (Pins 2, 3) input can be used to determine external threshold levels. For one specifically selected external threshold voltage level V+ or V–, Rx can be determined without use of Rp via the following equation. Equation 1 For two specifically selected external threshold voltage levels, V+ and V–, the use of Rx and Rp will permit this selection via equations 2, 3 provided the following conditions are met: Equation 2 Equation 3 See Application Note 1004 for more information. 1. In applications where dVCM/dt might exceed 50,000 V/μs (such as static discharge), a series resistor, RCC, should be included to protect the detector IC from destructively high surge currents. The recommended value for RCC is 240Ω per volt of allowable drop in VCC (between Pin 8 and VCC) with a minimum value of 240Ω. R x V +(-) V TH+(-) – I TH+(-) -------------------------------- = V + V - ------ V TH+ V TH- -----------and V + V TH+ – V - V TH- – ------------------------ I TH+ I TH- --------- < ≥ R X V TH+ V+ () V TH+ V- () – I TH+ VTH- () I TH- VTH+ () – -------------------------------------------------------- = R P V TH+ V+ () V TH+ V- () – I TH+ V- V – TH- () I TH- VTH+ V + – () – -------------------------------------------------------------------------------- = |
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