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参数资料
| 型号： | L6285S |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2 A, PDIP42 |
| 封装： | SDIP-42 |
| 文件页数： | 2/16页 |
| 文件大小： | 4214K |
| 代理商： | L6285S |
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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