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MC33030DWG bảng dữ liệu(PDF) 9 Page - ON Semiconductor |
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MC33030DWG bảng dữ liệu(HTML) 9 Page - ON Semiconductor |
9 / 17 page MC33030 http://onsemi.com 9 It must be remembered that points V1 through V4 always try to follow and center about the reference voltage setting if it is within the input common−mode voltage range of Pin 3; Figures 4 and 5. Initially consider that the feedback input voltage level is somewhere on the dashed line between V2 and V4 in [1]. This is within the dead zone range as defined above and the motor will be off. Now if the reference voltage is raised so that VPin 3 is less than V4, comparator B will turn−on [3] enabling Q Drive, causing Drive Output A to sink and B to source motor current [8]. The actuator will move in Direction B until VPin 3 becomes greater than V1. Comparator B will turn−off, activating the brake enable [4] and Q Brake [6] causing Drive Output A to go high and B to go into a high impedance state. The inertia of the mechanical system will drive the motor as a generator creating a positive voltage on Pin 10 with respect to Pin 14. The servo system can be stopped quickly, so as not to over−shoot through the dead zone range, by braking. This is accomplished by shorting the motor/generator terminals together. Brake current will flow into the diode at Drive Output B, through the internal VCC rail, and out the emitter of the sourcing transistor at Drive Output A. The end of the solid line and beginning of the dashed for VPin 3 [1] indicates the possible resting position of the actuator after braking. Inverting Input Overvoltage Monitor Drive Brake Logic + Drive Output A Drive Output B VCC Motor 10 11 Power H−Switch Q Brake Q Brake Overcurrent Monitor Overcurrent Reference ROC 15 + 16 CDLY Overcurrent Delay 5.5 mA 7.5 V Ref. 50 k R S Over− Current Latch Q Drive S Q Drive R Brake Enable Direction Latch 18 V Ref. Gearbox and Linkage GND 4, 5,12,13 + Window Detector VCC Reference Input Filter 20 k 35 mA A B 3.0 k 3.0 k 35 mA 20 k Non− Inverting Input 9 Input Filter + VCC Output 20 k 0.3 mA 8 20 k Error Amp Error Amp Output Filter/ Feedback Input Figure 17. Representative Block Diagram and Typical Servo Application 14 Q Q Q 100 k 2 1 Q 3 6 Reference Input 7 100 k |
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Mô tả tương tự - MC33030DWG |
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