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MC33094 Datasheet(PDF) 8 Page - Motorola, Inc |
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MC33094 Datasheet(HTML) 8 Page - Motorola, Inc |
8 / 16 page MC33094 8 MOTOROLA ANALOG IC DEVICE DATA 14 14.2 14.4 14.6 14.8 15 15.2 VO = 0 V ICL = 10 mA Figure 7. Output Clamp Voltage versus Temperature 25 30 35 40 45 50 Figure 8. Output Clamp Dynamic Impedance versus Temperature VO = 0 V ICL = 12 mA ∆ICL = 2.0 mA ZCL = ∆VCL/∆ICL -50 0 50 100 150 T, TEMPERATURE (°C) -50 0 50 100 150 T, TEMPERATURE (°C) 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Figure 9. Supply Drain Current versus Temperature Vin(-) = 0 V VCC = 6.0 V VD = 3.0 V -50 0 50 100 150 T, TEMPERATURE (°C) Block Diagram Description (Figure 10) The Band–Gap Reference generates a nominal 1.2 V having very good stability with temperature variations. The Band–Gap Reference conceptually provides a low temperature drift voltage by summing a strongly negative Temperature Coefficient (TC) voltage with an equally strong positive TC voltage. The negative TC voltage element is a result of a transistor emitter–to–base voltage while the positive TC voltage is developed as a result of a positive TC current imposed across a resistor. The positive TC current relies on the matching of currents in different sizes of transistors. The result is a very stable reference voltage independent of temperature variations. The Band–Gap Reference voltage provides a thermally stable voltage reference for critically sensitive circuits within the IC. It also sets the master bias current for all precision currents on the IC. The Vr Zener Reference block contains a 6.75 V zener regulator, which also exhibits a very low temperature coefficient. The VCC Comparator and Clamp block limits the VCC voltage to one Vbe plus three zener drops in addition to comparing the VCC voltage to 15 and 22 V. When the VCC voltage is greater than either of these two values, the IC changes the adaptive capacitor discharge rate and when above 22 V the IC forces the coil current to shutdown. The minimum VCC value the IC will operate at is 4.0 V and Vbat of 5.0 V. Below 7.5 V, the Vr reference is no longer maintained, and the IC consumes excess power and excess voltage is dropped in the external VCC resistor. The Master Bias Current Reference block generates precise currents used throughout the IC. The MB pin is held at 1.2 V by a differential amplifier with feedback. Capacitive loading on the MB pin reduces the effectiveness of the internal dominant pole, and loading as modest as 200 pF may cause the differential amplifier to oscillate. The Input Voltage Comparator block requires an input signal between ground and Vbat and detects the swing in the input signal. The thresholds for the input comparator are approximately 56.2% of Vbat for rising signals and 36% of Vbat for falling signals. The input signal may come from a Hall effect sensor or reluctor sensor on the distributor. The Negative Edge Filter block is an inverting buffer for the signal from the Input Voltage Comparator and has a time constant of approximately 0.1 µs for rising edges and 500 µs for falling edges. The Adaptive Capacitor Charging and Sensing block charges, discharges, and senses the adaptive capacitor voltage. The adaptive capacitor has a single charge rate of 8.4 µA and two discharge rates. The 1.688 µA slow discharge rate is used only during very high VCC operation and Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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