ZSCT1555 Просмотр технического описания (PDF) - Zetex => Diodes

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ZSCT1555

PRECISION SINGLE CELL TIMER

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ZSCT1555

Figure 5 shows the monostable mode used as

a pulse width modulator. Here the trigger pin

is supplied with a continuous pulse train, the

resulting output pulse width is modulated by

a signal applied to the control pin.

Astable operation

The configuration of Figure 7 produces a free

running multivibrator circuit whose frequency

is independent of supply voltage. The ratio of

resistors RA and RB precisely sets the circuit

duty cycle. The capacitor is charged and

discharged between thresholds at 0.2VCC and

0.8VCC. Oscillation frequency (f) and duty cycle

(d) can be calculated using the following

equations:-

f = 0.62/(RA + 2RB)CT

d = RB /(RA + 2RB)

Figure 5

Figure 6 shows typical waveform examples.

Figure 7

Figure 8 shows the waveforms generated in

this mode of operation.

Figure 6

Figure 8

Issue 3 - July 2006

© Zetex Semiconductors plc 2006

www.zetex.com

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