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L6285S 数据表(PDF) 10 Page - STMicroelectronics

部件名 L6285S
功能描述  3 CHANNELS MULTIPOWER SYSTEM
Download  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6285S 数据表(HTML) 10 Page - STMicroelectronics

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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


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