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L9907N Datasheet(PDF) 4 Page - STMicroelectronics |
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L9907N Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page FUNCTIONAL DESCRIPTION The L9907N is a power comparator with full- bridge push-pull outputs, intended for driving a DC motor in the headling adjustment system. The basic function of the device is shown in the input-output tranfer characteristic, Fig. 1. For differential input voltage (VINC -VINF) lower than the negative NEUTRAL ZONE threshold, VN- the output voltage is negative (corresponds to motor direction right), for increasing differential in- put voltage, this status changes to the zero output voltage (motor is actively braked), when the differ- ential input voltage exceeds the VST- stop range threshold. The output status remains in this condi- tion as long as the differential input voltage re- mains within the NEUTRAL ZONE. If the input voltage increases above the positive NEUTRAL ZONE threshold VN+, the output voltage become positive (motor direction left). Similar behaviour is obtained for decreasing the input voltage. The output status transitions are marked with the arrows showing the correspond- ing direction of the output status variation. The active braking mode is got with both outputs in ”HIGH” status The above described behaviour assures high po- sitioning precision, corresponding to the STOP RANGE and high noise immunity in the adjusted condition due to the NEUTRAL ZONE hysteresis thresholds . Both the above described thresholds are defined referring to INC,INF pins. The error due to voltage drop over the input signal source resistances RINC,RINF is minimized with extremely low input bias currents IINC,IINF. The above mentioned resistors (RINC,RINF) are necessary for the input current limitation during the transients on the VBAT line. The input source resistors must be dimensioned so that in case of a line transient the input current in the input pin, clamped with the internal input protection diodes do not increase over the specified absolute maxi- mum value. VBAT VS -2V 1.5V VF 0 1.5V VS -2V VBAT VC D95AT183A Figure 2: Control to feedbacktransfer characteristic for tracking regulation (VF =VC within the nominal VINC operating range): D1 D2 CS IQ RC VINC RINF RINC RPR RCF PR L9907N IINC INC VINF IINF INF VS RF VC VF GND OUT C OUT F M VM IM VBAT D95AT184 MODULE Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation (VF =VC for 1.5V < VC <VS -2V): Note: Recommended value of RINC,RINF (equivalent input resistance to INC and INF)is 5K Ω to 10KΩ. Resistor RCF should assure that the differential input voltage |VINC -VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiled the motor will not change its previous position. L9907N 4/8 |
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