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ST1S14 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

tên linh kiện ST1S14
Giải thích chi tiết về linh kiện  Power good open collector output
PDF  46 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST1S14 bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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Additional features and limitations
ST1S14
14/46
DocID17977 Rev 2
5
Additional features and limitations
5.1
Maximum duty cycle
The bootstrap circuitry charges, cycle-by-cycle, the external bootstrap capacitor to generate
a voltage higher than VIN necessary to drive the internal N-channel power element.
An internal linear regulator charges the CBOOT during the conduction time of the external
freewheeling diode during the switching activity. The internal logic implements a minimum
OFF time of the high side switch (90 nsec typ.) to prevent the bootstrap discharge at high
duty cycle. As a consequence, the ST1S14 can operate at a maximum duty cycle of around
90 % typ.
The ST1S14 embeds the diode VD1 required for the bootstrap operation.
Figure 7. Bootstrap operation



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