Datenblatt-Suchmaschine für elektronische Bauteile |
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CA3165E Datenblatt(PDF) 6 Page - Intersil Corporation |
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CA3165E Datenblatt(HTML) 6 Page - Intersil Corporation |
6 / 6 page 10-30 CA3165 FIGURE 6. TYPICAL IGNITION SYSTEM USING THE CA3165E R1 220 820 1W 5% 200 1W ±5% 220 C2 1500pF SILVER MICA VOUT L1 R6 6490 ± 0.15% C3 0.01 µF C6 0.01 µF METALLIC TRIGGER WHEEL, ONE TOOTH PER CYLINDER L1 SENSOR COIL, INDUCTANCE ≈ 100µH, UNLOADED Q ≈ 53 ALL RESISTORS 1/2 W ±5% UNLESS OTHERWISE SPECIFIED +13V 6 7 8 5 4 3 2 1 CA3165E VIEW TOP RESISTOR VALUES IN OHMS Application Information Figure 5 and Figure 6 show the application of the CA3165 in a typical ignition system. The oscillator on the chip operates at about 400kHz as determined by the tuned circuit L1, C2. The amplitude of the oscillation is detected on the chip and applied to a Schmitt trigger which sets the terminal voltage as shown in the chart in Figure 1 and Figure 2 for the unloaded condition of the oscillator. As a metallic tooth in the rotor passes the coil L1, eddy-current losses occur which reduce the Q of the resonant circuit and decrease the ampli- tude of the oscillations to a level below that of a reference in the detector circuit. The output terminals are then switched to states as shown in the chart in Figure 1 and Figure 2 for the loaded condition of the oscillator. The oscillation is main- tained at this lower amplitude by switching in additional feed- back in the oscillator circuit. The fact that the oscillator continues to operate at some minimum level during this dwell period eliminates timing variations which would occur if the oscillator had to be restarted by random noise. Spark occurs as terminal 4 is switched from high to low. The output amplifier clamps terminal 4 low through the regulator during the duration of the spark. The Dwell period represents the time that terminal 10 (CA3165E1) or terminal 6 (CA3165E) is high, terminal 4 is low, and the coil is charged. The value of the oscillator feedback, resistor, RF, is selected to set the dwell period. With a sintered-iron 8 f-tooth rotor, a typical value of RF is 6500Ω for 28.5 degrees of dwell out of a 45 degree cycle. For a star-type rotor and a particular coil in a typical distributor, the feedback resistor would be larger (typically 8800 Ω) depending on clearances, coil geometry and tooth shape. For typical F-Tooth Rotor with Rod Sensor and 113 µH of coil inductance, the Q and frequency with respect to rotor posi- tion was measured for the following positions CENTER 46 at 377kHz SLOT 6 at 390kHz FIRE 15 at 381kHz (Free air Q = 55.7 at 375kHz.) FIGURE 7. TIMING SEQUENCE DWELL PERIOD OSCILLATOR HIGH DETECTOR TERM 10 LOW HIGH TERM 4 LOW SPARK DWELL DWELL COIL CHARGE OSC UN- OSC LOADED LOADED |
Ähnliche Teilenummer - CA3165E |
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Ähnliche Beschreibung - CA3165E |
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