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L4984D Datasheet(PDF) 2 Page - STMicroelectronics |
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L4984D Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 35 page Contents L4984D 2/35 DocID024474 Rev 1 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1 Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7 Feedback failure detection (FFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 Voltage feedforward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 9 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 10 Inductor saturation detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 11 THD optimizer circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 12 Power management and housekeeping functions . . . . . . . . . . . . . . . . 30 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 |
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