SCT1555 Datasheet, PDF (9/10 Pages) Zetex Semiconductors – PRECISION SINGLE CELL TIMER

ZSCT1555
Figure 9 gives an easy selection for RA, RB and
C_T values.
Figure 11 shows the result of modulation with
a triangle wave input to the control pin.
100
100k
10
1M
1
10M
0.1
0.01
(RA+2RB)
0.001
0.1 1
10 100 1k 10k
Free Running Frequency (Hz)
Figure 9
100k
Similar to the PWM circuit of Figure 5 the astable
circuit can be configured with modulation of the
control input as shown in Figure 10. The result is a
pulse position modulated, PPM, circuit where the
pulse position is altered by the control input voltage.
Figure 11
Figure 10
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