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IL300 Datasheet(PDF) 7 Page - Siemens Semiconductor Group |
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IL300 Datasheet(HTML) 7 Page - Siemens Semiconductor Group |
7 / 8 page 5–7 IL300 Table 1 gives the value of R5 given the production K3 bins. Table 1. R5 selection The last step in the design is selecting the LED current limiting resistor (R4). The output of the operational amplifier is targeted to be 50% of the Vcc, or 2.5 V. With an LED quiescent current of 12 mA the typical LED (VF ) is 1.3 V. Given this and the opera- tional output voltage, R4 can be calculated. . The circuit was constructed with an LM201 differential opera- tional amplifier using the resistors selected. The amplifier was compensated with a 100 pF capacitor connected between pins 1 and 8. The DC transfer charateristics are shown in Figure 19. The amplifier was designed to have a gain of 0.6 and was mea- sured to be 0.6036. Greater accurracy can be achieved by adding a balancing circuit, and potentiometer in the input divider, or at R5. The circuit shows exceptionally good gain lin- earity with an RMS error of only 0.0133% over the input voltage range of 4 V–6 V in a servo mode; see Figure 20. Figure 19. Transfer gain Bins Min. Max. K3 Typ. R5 Resistor K Ω 1% K Ω A 0.560 0.623 0.59 50.85 51.1 B 0.623 0.693 0.66 45.45 45.3 C 0.693 0.769 0.73 41.1 41.2 D 0.769 0.855 0.81 37.04 37.4 E 0.855 0.950 0.93 32.26 32.4 F 0.950 1.056 1.00 30.00 30.0 G 1.056 1.175 1.11 27.03 27.0 H 1.175 1.304 1.24 24.19 24.0 I 1.304 1.449 1.37 21.90 22.0 J 1.449 1.610 1.53 19.61 19.4 R4 V opamp V F – I Fq -------------------------------- 2.5V 1.3V – 12mA ------------------------------ 100 Ω = = = 6.0 5.5 5.0 4.5 4.0 2.25 2.50 2.75 3.00 3.25 3.50 3.75 Vin - Input Voltage - V Vout = 14.4 mV + 0.6036 x Vin LM 201 Ta = 25 °C Figure 20. Linearity error vs. input voltage The AC characteristics are also quite impressive offering a -3 dB bandwidth of 100 KHz, with a -45 ° phase shift at 80 KHz as shown in Figure 21. Figure 21. Amplitude and phase power supply control The same procedure can be used to design isolation amplifiers that accept biploar signals referenced to ground. These amplifi- ers circuit configurations are shown in Figure 22. In order for the amplifier to respond to a signal that swings above and below ground, the LED must be prebiased from a separate source by using a voltage reference source (Vref1). In these designs, R3 can be determined by the following equation. 6.0 5.5 5.0 4.5 4.0 -0.015 -0.010 -0.005 0.000 0.005 0.010 0.015 0.020 0.025 Vin - Input Voltage - V LM201 10 3 10 4 10 5 10 6 -8 -6 -4 -2 0 2 -180 -135 -90 -45 0 45 dB PHASE F - Frequency - Hz R3 V ref1 I P1 ------------- V ref1 K1I Fq --------------- = = |
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