PLM393LVDR datasheet(21/29 Pages) TI1

21 / 29 page

100 NŸ

5 NŸ

VIN

20 0Ÿ

10 NŸ

100 NŸ

BAT54

VOUT

R1 = R2 = (R5 / 2)

RPU

10 NŸ

LM393LV-Q1

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Typical Applications (continued)

A bi-stable multivibrator has two stable states. The reference voltage is set up by the voltage divider of R2 and

R3. A pulse applied to the SET terminal will switch the output of the comparator high. The resistor divider of R1,

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.

10.2.8 Zero Crossing Detector

Figure 18. Zero Crossing Detector

A voltage divider of R4 and R5 establishes a reference voltage V1 at the non-inverting input. By making the series

resistance of R1 and R2 equal to R5, the comparator will switch when VIN = 0. Diode D1 insures that V3 clamps

near ground. The voltage divider of R2 and R3 then prevents V2 from going below ground. A small amount of

hysteresis is setup to ensure rapid output voltage transitions.

PLM393LVDR Datenblatt(PDF) 21 Page - Texas Instruments