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ST1S14 Datasheet(PDF) 14 Page - STMicroelectronics |
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ST1S14 Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 46 page  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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