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HCPL-5761-200 데이터시트(PDF) 9 Page - Agilent(Hewlett-Packard) |
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HCPL-5761-200 데이터시트(HTML) 9 Page - Agilent(Hewlett-Packard) |
9 / 11 page 9 Electrical Considerations The HCPL-5760, HCPL-5761, HCPL-576K or 5962-89477 optocoupler has internal temperature compensated, predictable voltage and current threshold points which allow selection of an external resistor, R x , to determine larger external threshold voltage levels. For a desired external threshold voltage, V± , a corresponding typical value of R x can be obtained from Figure 10. Specific calculation of R x can be obtained from Equation (1) of Figure 11. Specification of both V + and V - voltage threshold levels simulta- neously can be obtained by the use of R x and R p as shown in Figure 11 and determined by Equations (2) and (3). R x can provide over-current 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 R x and R p 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 dV CM/dt may be extremely large (such as static discharge), a series resistor, R CC , should be connected in series with V CC and Pin 8 to protect the Figure 10. Typical External Threshold Characteristic, V± vs. Rx. detector IC from destructively high surge currents. See note 14 for determination of R CC . 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 pullup resistor of 1.5 k Ω 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 - , R x can be determined without use of R p via V + - V TH+ (-) (-) R x = ––––––––– (1) I TH+ (-) See Application Note 1004 for more information. For two specifically selected external threshold voltage levels, V + and V - , the use of R x and R p will permit this selection via equations (2), (3) provided the following conditions are met: R P = V TH- (V+) - VTH+ (V-) ––––––––––––––––––––––––––– (3) I TH+ (V- - VTH-) + ITH- (VTH+ - V+) V TH- (V + ) - V TH+ (V - ) R x = –––––––––––––––––––– (2) I TH+ (V TH- ) - I TH- (V TH+ ) V + V TH+ V + - V TH+ I TH+ ––– ≥ ––– and –––––––– < –––– V - V TH- V - - V TH- I TH- Figure 9. Operating Circuit for Burn-In and Steady State Life Tests. |
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