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LM555-MIL

更新时间： 2022-10-12 16:34:18

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LM555-MIL 数据手册

LM555

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SNAS548C –FEBRUARY 2000–REVISED MARCH 2013

The charge time (output high) is given by:

t₁= 0.693 (R_A+ R_B) C

(1)

(2)

(3)

And the discharge time (output low) by:

t₂= 0.693 (R_B) C

Thus the total period is:

T = t₁+ t₂= 0.693 (R_A+2R_B) C

The frequency of oscillation is:

(4)

(5)

Figure 17 may be used for quick determination of these RC values.

The duty cycle is:

Figure 17. Free Running Frequency

FREQUENCY DIVIDER

The monostable circuit of Figure 12 can be used as a frequency divider by adjusting the length of the timing

cycle. Figure 18 shows the waveforms generated in a divide by three circuit.

V_CC= 5V

Top Trace: Input 4V/Div.

TIME = 20μs/DIV. Middle Trace: Output 2V/Div.

R_A= 9.1kΩ

C = 0.01μF

Bottom Trace: Capacitor 2V/Div.

Figure 18. Frequency Divider

PULSE WIDTH MODULATOR

When the timer is connected in the monostable mode and triggered with a continuous pulse train, the output

pulse width can be modulated by a signal applied to pin 5. Figure 19 shows the circuit, and in Figure 20 are

some waveform examples.

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