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L9374LF bảng dữ liệu(PDF) 31 Page - STMicroelectronics

tên linh kiện L9374LF
Giải thích chi tiết về linh kiện  Four channel valve driver
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9374LF bảng dữ liệu(HTML) 31 Page - STMicroelectronics

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L9374LF
Circuit description
79
Figure 16. Sync-failure + re-synchronization
Re-synchronizing
The master sets the SYNC_TRIG bit to ‘1’ (section 5.1.1) to re-initialize the sync counter.
This re-synchronizes the L9374LF synchronization controller to the master. When this bit is
set three counters are reset: the PWM counter (output frequency and duty cycle),
synchronization counter and the duration counter. The SYNC_TRIG bit is reset (set to ‘0’) by
the L9374LF upon re-synchronization.
The picture below shows the behavior of the output when the synchronization is done. The
time tx is anything lower than 250 μs.
Figure 17. Behavior of the output when the synchronization is done
4.3.2
Time shift between output actuation
The actuations of the outputs are time shifted by 90° (typ. 62.5 μs) to offset their effect on
the supply during switching. This balances the incremental switching current and reduces
the EME generated by the switching of these channels. The new duty cycle or target current
also becomes valid with this 90 degree time shift after the SYNC_SIG.



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