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MC10198 数据表(PDF) 6 Page - ON Semiconductor |
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MC10198 数据表(HTML) 6 Page - ON Semiconductor |
6 / 10 page MC10198 3–177 MOTOROLA MECL Data DL122 — Rev 6 APPLICATIONS INFORMATION Circuit Operation: 1.PULSE WIDTH TIMING — The pulse width is deter- mined by the external resistor and capacitor. The MC10198 also has an internal resistor (nominally 284 ohms) that can be used in series with RExt. Pin 7, the external pulse width control, is a constant voltage node (–3.60 V nominally). A resistance connected in series from this node to VEE sets a constant timing current IT. This current determines the discharge rate of the ca- pacitor: where ∆T = pulse width ∆V = 1.9 V change in capacitor voltage Then: If RExt + RInt are in series to VEE: IT = [(–3.60 V) – (–5.2 V)] ÷ [RExt + 284 Ω] IT = 1.6 V/(RExt + 284) The timing equation becomes: ∆T = [(CExt)(1.9 V)] ÷ [1.6 V/(RExt + 284)] ∆T = CExt (RExt + 284) 1.19 where ∆T = Sec RExt = Ohms CExt = Farads Figure 2 shows typical curves for pulse width versus CExt and RExt (total resistance includes RInt). Any low leakage capacitor can be used and RExt can vary from 0 to 16 k–ohms. 2.TRIGGERING —The Epos and ENeg inputs control the trigger input. The MC10198 can be programmed to trig- ger on the positive edge, negative edge, or both. Also, the trigger input can be totally disabled. The truth table is shown on the first page of the data sheet. The device is totally retriggerable. However, as duty cycle approaches 100%, pulse width jitter can occur due to the recovery time of the circuit. Recovery time is basically dependent on capacitance CExt. Figure 3 shows typical recovery time versus capaci- tance at IT = 5 mA. IT = CExt ∆V ∆T ∆T = CExt 1.9 V IT VEE = –5.2 V –3.60 V External Pulse Width Control 284 Ω RInt MC10198 RExt FIGURE 1 — CExt 6 4 7 10 k Ω RExt = 0 3 k Ω 500 Ω CExt – TIMING CAPACITANCE 10 pF 10 FIGURE 2 – TIMING PULSE WIDTH versus CExt and RExt 100 10 1 0.1 µF 100 1000 pF 100 pF 0.01 µF NOTE: TOTAL RESISTANCE = RExt + RInt CExt – TIMING CAPACITANCE 0.01 µF 100 pF 1000 pF 100 ns 0.1 µF 10 µs 1 µs 1 ns 10 ns 10 pF FIGURE 3 — RECOVERY TIME versus CExt @ IT = 5 mA |
类似零件编号 - MC10198 |
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类似说明 - MC10198 |
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