Datenblatt-Suchmaschine für elektronische Bauteile |
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TC1025CEUA Datenblatt(PDF) 6 Page - Microchip Technology |
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TC1025CEUA Datenblatt(HTML) 6 Page - Microchip Technology |
6 / 16 page TC1025 DS21656C-page 6 © 2005 Microchip Technology Inc. The frequency stability of this circuit should only be a function of the external component tolerances. Figure 4-5 shows the circuit for a pulse width modulator circuit. It is essentially the same as in Figure 4-4, but 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 4-5 (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: 32.768 kHz “TIME OF DAY” CLOCK OSCILLATOR FIGURE 4-3: NON-RETRIGGERABLE MULTIVIBRATOR + – VR VDD VOUT VSRC RA RB RC 1/2 TC1025 + VDD VOUT VDD RB 150k RA 150k RC 1M CA 100pF 32.768kHz Vper = 30.52µsec 1/2 TC1025 _ + – + – VDD CMPTR1 CMPTR2 IN IN OUT OUT R3 1M R4 1M R6 562k R7 1M R2 100k R1 100k R8 D2 D1 10M R9 243k R5 10M C1 100pF R10 61.9k A B C GND t0 C GND VDD GND VDD TC1025 TC1025 |
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