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LM397 bảng dữ liệu(PDF) 8 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Single General-Purpose Voltage Comparator
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LM397 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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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
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