參數(shù)資料
型號(hào): LMV824MX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps
中文描述: QUAD OP-AMP, 3500 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO14
封裝: PLASTIC, SOP-14
文件頁(yè)數(shù): 15/24頁(yè)
文件大小: 1068K
代理商: LMV824MX
2.5 Tri-level Voltage Detector
The tri-level voltage detector of Figure 13 provides a type of
window comparator function. It detects three different input
voltage ranges: Min-range, Mid-range, and Max-range. The
output voltage (V
) is at V
for the Min-range. V
O
is
clamped at GND for the Mid-range. For the Max-range, V
is
at V
. Figure 14 shows a V
O
vs. V
I
oscilloscope photo per
the circuit of Figure 13
Its operation is as follows: V
I
deviating from GND, causes
the diode bridge to absorb I
IN
to maintain a clamped condi-
tion (V
= 0V). Eventually, I
reaches the bias limit of the di-
ode bridge. When this limit is reached, the clamping effect
stops and the op amp responds open loop. The design equa-
tion directly preceding Figure 14 shows how to determine
the clamping range. The equation solves for the input volt-
age band on each side GND. The mid-range is twice this
voltage band.
DS100128-89
DS100128-34
FIGURE 13. Tri-level Voltage Detector
OV
-VIN
+VIN
-
+
OV
|
v |
v |
DS100128-35
FIGURE 14. X, Y Oscilloscope Trace showing V
OUT
vs
V
IN
per the Circuit of
Figure 13
www.national.com
15
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