LMV331M7X datasheet(19/38 Pages) TI1

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LMV331-N, LMV339-N, LMV393-N

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SNOS018H – AUGUST 1999 – REVISED DECEMBER 2014

Typical Applications (continued)

8.2.3 Pulse Generator With Variable Duty Cycle

Figure 24. Pulse Generator With Variable Duty Cycle

The pulse generator with variable duty cycle is just a minor modification of the basic square wave generator.

Providing a separate charge and discharge path for capacitor C1generates a variable duty cycle. One path,

through R2 and D2 will charge the capacitor and set the pulse width (t1). The other path, R1 and D1 will discharge

the capacitor and set the time between pulses (t2).

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:

(16)

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