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IL611-1ETR13 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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IL611-1ETR13 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
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7 / 14 page  IL610 IL611 IL612 IL613 IL614 7 Operation The IL600 series are current mode devices. Changes in current flow into the input coil result in logic state changes at the output. One of the great advantages of the passive coil input is that both single ended and differential inputs can be handled without the need for reverse bias protection. The internal GMR sensor switches the output to logic low if current flows from (In-) to (In+). Only a single resistor is required to limit the input coil to the recommended 10 mA. This allows large input voltages to be used since there is no semiconductor structure on the input. The absolute maximum current through the coil of the IL600 series is 25 mA DC. However, it is important to limit input current to levels well below this in all applications. The worst case logic threshold current is 10 mA. While typical threshold currents are substantially less than this, NVE recommends designing a 10 mA logic threshold current in each application. In all cases, the current must flow from In- to In+ in the coil to switch the output low. This is true regardless of true or inverted data configurations. Output logic high is the zero input current state. Figure 1 shows the response of the IL600 series. The GMR bridge structure is designed such that the output of the isolator is logic high when no field signal is present. The output will switch to the low state with 10 mA of coil current and the output will switch back to the high state when the input current falls below 2 mA. This allows glitch- free interface with low slew rate signals. Figure 1. IL600 Series Transfer Function To calculate the value of the protection resistor (R1) required, use Ohm’s law as shown in the examples below. It should be noted that we are concerned only with the magnitude of the voltage across the coil. The absolute values of Vin High and Vin Low are arbitrary. Figure 2. Series Resistor Calculation Equivalent Circuit. Example 1. In this case, Tnom = 25ºC, Vin High is 24 V, Vin Low is 1.8 V, and Icoil minimum is specified as 10 mA. Total loop resistance is Ω 5 = ) − ( = Ω = Ω = = + 214 Ω 55 2220 R1 Therefore, 2220 0.01 22.2 I Low) V - High (V ) R (R1 coil in in coil Example 2. At a maximum operating temperature of 85°C, Tmax = 85ºC, Tnom = 25ºC, Vin High = 5 V, Vin Low = 0 V, and nominal Rcoil = 55 Ω. At Tmax = 85ºC () Ω = − = = Ω = + = × + = × ) − ( + = 435 65 0.01 0 - 5 R - I Low) V - High (V R1 is resistor series d recommende the Therefore, 65 9 . 9 55 165 . 0 25 - 85 55 TCR T T 55 R coil coil in in coil min max coil Allowance should also be made for the temperature coefficient of the current limiting resistor to ensure that Icoil is 10 mA at maximum operating temperature. Power Supplies It is recommended that 47 nF ceramic capacitors be used to decouple the power supplies. The capacitors must be placed as close as possible to VDD for proper operation. |
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