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NE555 データシート(PDF) 6 Page - Unisonic Technologies |
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NE555 データシート(HTML) 6 Page - Unisonic Technologies |
6 / 8 page NE555 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 6 of 8 www.unisonic.com.tw QW-R106-001,F TYPICAL APPLICATION NOTES The application circuit shows astable mode configuration. Pin 6 (Threshold ) is tied to Pin 2 ( Trigger ) and Pin 4 ( reset ) is tied to VCC ( Pin 8 ). The external capacitor C1 of Pin 6 and Pin 2 charges through RA, RB and dischages through RB only. In the internal circuit of UTC NE555 , one input of the upper comparator is at voltage of 2/3Vcc(R1=R2=R3),another input is connected to Pin 6.As soon as C1 is charging to higher than 2/3Vcc, transistor Q1 is turned ON and discharge C1 to collector voltage of transistor Q1. Therefore, the flip-flop circuit is reset and output is low. One input of lower comparator is at voltage of 1/3Vcc, discharge transistor Q1 turn off and C1 charges through RA and RB. Therefore, the flip-flop circuit is set output high. That is, when C1 charges through RA and RB , output is high and when C1 discharge through RB ,output is low. The charge time(output is high) t1 is 0.693(RA+RB) C1 and the discharge time (output is low) T2 is 0.693 RB*C1. ln Vcc 1 3 Vcc Vcc 2 3 Vcc 0.693 − − ⎛ ⎝ ⎜ ⎜ ⎜ ⎞ ⎠ ⎟ ⎟ ⎟ = T1=0.693*(RA+RB)*C1 Thus the total period time T is given by T2=0.693*RB*C1 T=T1+T2=0.693(RA+2RB)*C1. Then the frequency of astable mode is given by C1 * ) R (R 1.44 T 1 f B A 2 + = = The duty cycle is given by B A B 2R R R T T2 D.C. + = = . |
同様の部品番号 - NE555_15 |
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同様の説明 - NE555_15 |
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