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L9374LF bảng dữ liệu(PDF) 55 Page - STMicroelectronics

tên linh kiện L9374LF
Giải thích chi tiết về linh kiện  Four channel valve driver
PDF  80 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9374LF bảng dữ liệu(HTML) 55 Page - STMicroelectronics

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L9374LF
Circuit description
79
Figure 36. Test failed: high resistive load / undercurrent
A failed test sequence for under current condition
The test sequence:
1.
Disable Edge Shaping (Command address 2, bits D8 & D7 = ‘10’)
2.
Initiate SVDT (Command address 2; bits D1 & D0 = ‘10’)
3.
Qx switches on at the next sync-signal (sequence of actuation: Q1..Q4)
4.
The output current increases but does not reach the undercurrent value, IUC.
5.
After ty the output is switched off.
6.
After the output is disabled if the output clamps the voltage to VZ (35V) a Dx_Loss is
detected.
7.
If an Over temperature is not detected then the SDVT test is passed
8.
The SVDT will then test at Qx+1 until all 4 outputs have been tested.
Criterion:
the current value does not reach the undercurrent value within time ty
SPI:
Status registers 1 - 4, UC_Qx bit is set.



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