LMV331-N, LMV339-N, LMV393-N
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SNOS018G –AUGUST 1999–REVISED FEBRUARY 2013
By varying resistor R1, the time between pulses of the generator can be changed without changing the pulse
width. Similarly, by varying R2, the pulse width will be altered without affecting the time between pulses. Both
controls will change the frequency of the generator. The pulse width and time between pulses can be found from:
Figure 18. Pulse Generator
(16)
Solving these equations for t1 and t2
t1 =R4C1ln2
t2 =R5C1ln2
(17)
(18)
These terms will have a slight error due to the fact that Vmax is not exactly equal to 2/3 VCC but is actually
reduced by the diode drop to:
(19)
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