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IL300-E-X009 Datasheet(PDF) 8 Page - Vishay Siliconix |
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IL300-E-X009 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 15 page www.vishay.com 8 Document Number 83622 Rev. 1.4, 26-Oct-04 VISHAY IL300 Vishay Semiconductors Application Considerations In applications such as monitoring the output voltage from a line powered switch mode power supply, mea- suring bioelectric signals, interfacing to industrial transducers, or making floating current measure- ments, a galvanically isolated, DC coupled interface is often essential. The IL300 can be used to construct an amplifier that will meet these needs. The IL300 eliminates the problems of gain nonlinear- ity and drift induced by time and temperature, by mon- itoring LED output flux. A PIN photodiode on the input side is optically cou- pled to the LED and produces a current directly pro- portional to flux falling on it. This photocurrent, when coupled to an amplifier, provides the servo signal that controls the LED drive current. The LED flux is also coupled to an output PIN photo- diode. The output photodiode current can be directly or amplified to satisfy the needs of succeeding cir- cuits. Isolated Feedback Amplifier The IL300 was designed to be the central element of DC coupled isolation amplifiers. Designing the IL300 into an amplifier that provides a feedback control sig- nal for a line powered switch mode power is quite sim- ple, as the following example will illustrate. See Figure 17 for the basic structure of the switch mode supply using the Infineon TDA4918 Push-Pull Switched Power Supply Control Chip. Line isolation and insulation is provided by the high frequency transformer. The voltage monitor isolation will be pro- vided by the IL300. Figure 12. Amplitude Response vs. Frequency Figure 13. Amplitude and Phase Response vs. Frequency Figure 14. Common-Mode Rejection iil300_12 10 4 10 5 10 6 5 0 -5 -10 -15 -20 F - Frequency - Hz RL=1.0 KΩˇ RL=10 KΩˇ IF=10 mA, Mod = ±2.0 mA (peak) iil300_13 dB PHASE 103 104 105 106 107 5 0 -5 -10 -15 -20 45 0 -45 -90 -135 -180 F - Frequency - Hz IFq=10 mA Mod= ±4.0 mA TA=25°C RL=50 Ω iil300_14 10 100 1000 10000 100000 1000000 -130 -120 -110 -100 -90 -80 -70 -60 F - Frequency - Hz Figure 15. Photodiode Junction Capacitance vs. Reverse Voltage iil300_15 0 2 4 6 8 10 12 14 Voltage - Vdet 024 6 8 10 |
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