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AN2938 Datasheet(PDF) 3 Page - STMicroelectronics |
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AN2938 Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 39 page ![]() AN2938 Contents Doc ID 15429 Rev 1 3/39 9.17 MOSFET dual option, high side connection section 1 . . . . . . . . . . . . . . . 22 9.18 MOSFET dual option, high side connection section 2 . . . . . . . . . . . . . . . 23 10 Test setup and performance summary . . . . . . . . . . . . . . . . . . . . . . . . . 24 10.1 Test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 11 Representative waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 11.1 Operating modes-skip, NA skip, PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 11.1.1 Switching sections soft-start and soft-end . . . . . . . . . . . . . . . . . . . . . . . 26 11.1.2 Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 11.1.3 Fault management: overvoltage and undervoltage . . . . . . . . . . . . . . . . 31 11.2 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 11.2.1 OUT1 and OUT2 output efficiency vs load current . . . . . . . . . . . . . . . . 33 11.2.2 OUT1 and OUT2 switching frequency vs. load current . . . . . . . . . . . . . 34 11.2.3 OUT1 and OUT2 output voltage vs. load current . . . . . . . . . . . . . . . . . . 35 11.2.4 Power consumption analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 |
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