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LMC6772 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMC6772 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 11 page Typical Applications (Continued) One-Shot Multivibrator A monostable multivibrator has one stable state in which it can remain indefinitely. It can be triggered externally to an- other quasi-stable state. A monostable multivibrator can thus be used to generate a pulse of desired width. The desired pulse width is set by adjusting the values of C 2 and R 4. The resistor divider of R1 and R2 can be used to de- termine the magnitude of the input trigger pulse. The LMC6772 will change state when V 1 < V2. Diode D2 pro- vides a rapid discharge path for capacitor C 2 to reset at the end of the pulse. The diode also prevents the non-inverting input from being driven below ground. Bi-Stable Multivibrator A bi-stable multivibrator has two stable states. The reference voltage is set up by the voltage divider of R 2 and R3. A pulse applied to the SET terminal will switch the output of the com- parator high. The resistor divider of R 1,R4, and R5 now clamps the non-inverting input to a voltage greater than the reference voltage. A pulse applied to RESET will now toggle the output low. Zero Crossing Detector A voltage divider of R 4 and R5 establishes a reference volt- age V 1 at the non-inverting input. By making the series resis- tance of R 1 and R2 equal to R5, the comparator will switch when V IN = 0. Diode D1 insures that V3 never drops below −0.7V. The voltage divider of R 2 and R3 then prevents V2 from going below ground. A small amount of hysteresis is setup to ensure rapid output voltage transitions. Oscillator Figure 8 shows the application of the LMC6772 in a square wave generator circuit. The total hysteresis of the loop is set by R 1,R2 and R3.R4 and R5 provide separate charge and discharge paths for the capacitor C. The charge path is set through R 4 and D1. So, the pulse width t1 is determined by the RC time constant of R 4 and C. Similarly, the discharge path for the capacitor is set by R 5 and D2. Thus, the time t2 between the pulses can be changed by varying R 5, and the pulse width can be altered by R 4. The frequency of the out- put can be changed by varying both R 4 and R5. DS012347-28 FIGURE 5. One-Shot Multivibrator DS012347-30 FIGURE 6. Bi-Stable Multivibrator DS012347-29 FIGURE 7. Zero Crossing Detector DS012347-31 FIGURE 8. Square Wave Generator www.national.com 8 |
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