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參數(shù)資料
| 型號： | TC1039CECH |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Linear Building Block . Single Comparator in SOT Packages |
| 中文描述： | 線性積木。采用SOT比較單一的軟件包 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 481K |
| 代理商： | TC1039CECH |
2002 Microchip Technology Inc.
DS21344B-page 7
TC1037/TC1038/TC1039
Capacitor C1 will charge up through R4. When the
voltage of the comparator's inverting input is equal to
V
H
, the comparator output will switch. With the output
at ground potential, the value at the non-inverting input
terminal (V
L
) is reduced by the hysteresis network to a
value given by:
EQUATION 4-7:
Using the same resistors as before, capacitor C1 must
now discharge through R4 toward ground. The output
will return to a high state when the voltage across the
capacitor has discharged to a value equal to V
L
. The
period of oscillation will be twice the time it takes for the
RC circuit to charge up to one half its final value. The
period can be calculated from:
EQUATION 4-8:
The frequency stability of this circuit should only be a
function of the external component tolerances.
Figure 4-6 shows the circuit for a pulse width modulator
circuit. It is essentially the same as in Figure 4-5 with
the addition of an input control voltage. When the input
control voltage is equal to one-half V
DD
, operation is
basically the same as described for the free-running
oscillator. If the input control voltage is moved above or
below one-half V
DD
, the duty cycle of the output square
wave will be altered. This is because the addition of the
control voltage at the input has now altered the trip
points. The equations for these trip points are shown in
Figure 4-6 (see V
H
and V
L
).
Pulse width sensitivity to the input voltage variations
can be increased by reducing the value of R6 from
10K
and conversely, sensitivity will be reduced by
increasing the value of R6. The values of R1 and C1
can be varied to produce the desired center frequency.
FIGURE 4-1:
COMPARATOR
EXTERNAL HYSTERESIS
CONFIGURATION
FIGURE 4-2:
PRECISION BATTERY MONITOR
V
L
V
3
----------
=
FREQ
------1
2 0.694
)
R4
(
)
C1
(
)
=
+
–
V
R
V
DD
V
OUT
V
SRC
R
A
R
B
R
C
TC1037
V
DD
V
DD
V
DD
R2, 330k, 1%
TC1034
R4, 470k, 1%
R5, 7.5M
R6, 7.5M
R3, 470k, 1%
R1, 270k, 1%
V
R
To System DC/DC
Converter
3V
Alkaline
TC1039
BATTFAIL
BATTLOW
CMPTR1
–
+
CMPTR2
+
–
AMP1
–
+
+
TC1037
TC1039
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