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L6285S 数据表(PDF) 10 Page - STMicroelectronics |
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L6285S 数据表(HTML) 10 Page - STMicroelectronics |
10 / 16 page Oscillator For Clock and Reset Generation The oscillator block provides for two functions: 1)Generate an internal reset signal when the voltage at pin osc/res is below 1V. The reset signal switches off all the outputs and resets the logic registers. 2)Generate, when the pin osc/res is left free two syncro signals p1 and p2 for the clock of the PWM Current Control of the two stepper driver blocks The oscillator operates like the 555 concept in which the capacitor voltage oscillates between 1/3VS 2/3VS (Fig. 6). The oscillator frequency is 2 times the chopping frequency in order to generate the two syncro signals at operative 20KHz PWM. The tCH = charge time of Cosc is defined by Rosc, VTH1 and VTH2 ( threshold voltages)and Cosc. The discharge time Tdsc is practically only defined by Cosc and the internal discarge resistor Rdsc. The tdsc is also the time lockout during which the RS FF cannot read the Comparator output (see Fig. 4) Figure 6: Oscillator Concept L6285 10/16 |
类似零件编号 - L6285S |
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类似说明 - L6285S |
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