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AN2836 bảng dữ liệu(PDF) 28 Page - STMicroelectronics

tên linh kiện AN2836
Giải thích chi tiết về linh kiện  Modern motion control applications need more flexibility that can be addressed
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2836 bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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Designing an application with L6225, L6226, L6227
AN2836
28/57
Doc ID 15084 Rev 1
Figure 27.
Output current detection threshold versus RCL value (L6226 only)
The overcurrent detection threshold can also be adjusted through an external reference
voltage, as shown in Figure 28. The external reference voltage source should be able to sink
current (about 300 µA maximum). Moreover, if the supply voltage is provided to the L6226
before VEXT, and its EN pins are at a high logic level, the device starts working with minimum
OCD threshold (actually the capacitor placed at the bottom of RCL allows a short startup
time with a higher OCD threshold). VEXT can also be obtained through a PWM output of a
µC, adding a series resistor to obtain a low-pass filter.
The OCD threshold (ISOVER) follows the equation:
●
ISOVER =
±10%, at -25 °C < Tj < 125 °C if 0.25 A < ISOVER < 2.25 A
Figure 28.
Adjusting the OCD threshold through an external reference voltage
(L6226 only)
9208.3 1.2V
Vext
–
()
R
CL
-------------------------------------------------------



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