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TC1038 Folha de dados(PDF) 7 Page - Microchip Technology

Nome de Peças TC1038
Descrição Electrónicos  Linear Building Block . Single Comparator in SOT Packages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1038 Folha de dados(HTML) 7 Page - Microchip Technology

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© 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
VH, the comparator output will switch. With the output
at ground potential, the value at the non-inverting input
terminal (VL) 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 VL.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 VDD, operation is
basically the same as described for the free-running
oscillator. If the input control voltage is moved above or
below one-half VDD, 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 VH and VL).
Pulse width sensitivity to the input voltage variations
can be increased by reducing the value of R6 from
10K
Ω 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
DD
3
-----------
=
1
FREQ
-----------------
2 0.694
() R4
() C1
()
=
+
VR
VDD
VOUT
VSRC
RA
RB
RC
TC1037
VDD
VDD
VDD
R2, 330k, 1%
TC1034
R4, 470k, 1%
R5, 7.5M
R6, 7.5M
R3, 470k, 1%
R1, 270k, 1%
VR
To System DC/DC
Converter
3V
Alkaline
TC1039
BATTFAIL
BATTLOW
CMPTR1
+
CMPTR2
+
AMP1
+
+
TC1037
TC1039


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