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LM393 bảng dữ liệu(PDF) 5 Page - ON Semiconductor |
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LM393 bảng dữ liệu(HTML) 5 Page - ON Semiconductor |
5 / 10 page LM393, LM393E, LM293, LM2903, LM2903E, LM2903V, NCV2903 www.onsemi.com 5 APPLICATIONS INFORMATION These dual comparators feature high gain, wide bandwidth characteristics. This gives the device oscillation tendencies if the outputs are capacitively coupled to the inputs via stray capacitance. This oscillation manifests itself during output transitions (VOL to VOH). To alleviate this situation, input resistors < 10 k W should be used. The addition of positive feedback (< 10 mV) is also recommended. It is good design practice to ground all unused pins. Differential input voltages may be larger than supply voltage without damaging the comparator’s inputs. Voltages more negative than −0.3 V should not be used. Figure 8. Zero Crossing Detector (Single Supply) Figure 9. Zero Crossing Detector (Split Supply) Figure 10. Free−Running Square−Wave Oscillator Figure 11. Time Delay Generator Figure 12. Comparator with Hysteresis 10 D1 prevents input from going negative by more than 0.6 V. R1 + R2 = R3 R3 ≤ R5 for small error in zero crossing. Vin 10 k D1 R1 8.2 k 6.8 k R2 15 k R3 +15 V 10 m R5 220 k R4 220 k LM393 Vin(min) [ 0.4 V peak for 1% phase distortion (DQ). * Q +VCC 10 k Vin -VEE Vin Vin(min) VCC VO - VEE DQ Q LM393 - + LM393 51 k 51 k 51 k RL 10 k VCC VCC VCC VO VO t 0 1.0 m W 0.001 mF - + LM393 VCC VCC VO Vin VO + Vref Vref Vref 0 0 0 VC tO t ``ON'' for t tO + Dt where: Dt = RC n ( Vref VCC ) R RL VC C LM393 - + RS VCC RL Vref R1 R2 RS = R1 | | R2 Vth1 = Vref + (VCC -Vref) R1 R1 + R2 + RL Vth2 = Vref - (Vref -VO Low) R1 R1 + R2 R1 t + - LM393 ) * ) |
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