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IL300-F-X006 Datasheet(PDF) 11 Page - Vishay Siliconix |
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IL300-F-X006 Datasheet(HTML) 11 Page - Vishay Siliconix |
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11 / 15 page  VISHAY IL300 Document Number 83622 Rev. 1.5, 24-Mar-05 Vishay Semiconductors www.vishay.com 11 The last step in the design is selecting the LED cur- rent limiting resistor (R4). The output of the opera- tional 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 operational amplifier using the resistors selected. The amplifier was compensated with a 100 pF capacitor connected between pins 1 and 8. The DC transfer characteristics are shown in Figure 19. The amplifier was designed to have a gain of 0.6 and was measured to be 0.6036. Greater accuracy can be achieved by adding a balancing circuit, and potentiometer in the input divider, or at R5. The circuit shows exceptionally good gain linearity with an RMS error of only 0.0133 % over the input voltage range of 4.0 V - 6.0 V in a servo mode; see Figure 20. The AC characteristics are also quite impressive offering a - 3.0 dB bandwidth of 100 kHz, with a -45 ° phase shift at 80 kHz as shown in Figure 21. The same procedure can be used to design isolation amplifiers that accept bipolar signals referenced to ground. These amplifiers 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 pre biased from a separate source by using a voltage reference source (Vref1). In these designs, R3 can be determined by the following equation. Figure 19. Transfer Gain Vopamp -VF I Fq = 2.5 V - 1.3 V 12 mA = 100 Ω R4 = 17096 iil300_19 6.0 5.5 5.0 4.5 4.0 2.25 2.50 2.75 3.00 3.25 3.50 3.75 Vout = 14.4 mV + 0.6036 x Vin LM 201 Ta = 25°C Figure 20. Linearity Error vs. Input Voltage Figure 21. Amplitude and Phase Power Supply Control iil300_20 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 iil300_21 dB PHASE 10 3 10 4 10 5 10 6 2 0 -2 -4 -6 -8 45 0 -45 -90 -135 -180 F - Frequency - Hz R3 = Vref1 IP1 = Vref1 K1IFq 17098 |
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