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LM397 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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LM397 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 19 page VO 0 VIN VT2 VT1 1 10 100 OUTPUT SINK CURRENT (mA) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 85°C 25°C -40°C LM397 SNOS977E – MAY 2001 – REVISED OCTOBER 2015 www.ti.com Feature Description (continued) Figure 7. Output Saturation Voltage vs Output Sink Current 7.4 Device Functional Modes 7.4.1 Hysteresis The basic comparator configuration may oscillate or produce a noisy output if the applied differential input is near the input offset voltage of the comparator. This tends to occur when the voltage on the input is equal or very close to the other input voltage. Adding hysteresis can prevent this problem. Hysteresis creates two switching thresholds (one for the rising input voltage and the other for the falling input voltage). Hysteresis is the voltage difference between the two switching thresholds. When both inputs are nearly equal, hysteresis causes one input to effectively move quickly pass the other. Thus, effectively moving the input out of region that oscillation may occur. For an inverting configured comparator, hysteresis can be added with a three resistor network and positive feedback. When input voltage (VIN) at the inverting node is less than non-inverting node (VT), the output is high. The equivalent circuit for the three resistor network is R1 in parallel with R3 and in series with R2. The lower threshold voltage VT1 is calculated by Equation 1: VT1 = ((VS R2) / (((R1 R3) / (R1 + R3)) + R2)) (1) When VIN is greater than VT, the output voltage is low. The equivalent circuit for the three resistor network is R2 in parallel with R3 and in series with R1. The upper threshold voltage VT2 is calculated by Equation 2: VT2 = VS ((R2 R3) / (R2 + R3)) / (R1 + ((R2 R3) / (R2 + R3))) (2) The hysteresis is defined in Equation 3: ΔVIN = VT1 – VT2 (3) Figure 8. Inverting Configured Comparator - LM397 8 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: LM397 |
Số phần tương tự - LM397_15 |
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Mô tả tương tự - LM397_15 |
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