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HM8116A データシート(PDF) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

部品番号. HM8116A
部品情報  Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
ダウンロード  13 Pages
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メーカー  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
ホームページ  http://www.hmsemi.com/
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HM8116A Datasheet(HTML) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
Internal Soft-Start
The soft-start is implemented to prevent the converter output voltage from overshooting during startup. When the
chip starts, the internal circuitry generates a soft-start voltage (SS) ramping up from 0V to 0.8V. When it is lower
than the internal reference (REF), SS overrides REF so the error amplifier uses SS as the reference. When SS is
higher than REF, REF regains control. The SS time is internally max to 1ms.
Over Current Protection with Foldback
The
has cycle-by-cycle over current limit when the inductor current peak value exceeds the set current
limit threshold. Meanwhile, output voltage starts to drop until FB is below the Under-Voltage (UV) threshold. When
the output is shorted to the ground, the switching frequency is folded back and the current limit is reduced to lower
the short circuit current. The frequency foldback helps prevent inductor current runaway and thermal issue during
short circuit. The HM8116A exits the foldback mode once the over current condition is removed.
Startup and Shutdown
If both VIN and EN are higher than their appropriate thresholds, the chip starts. The reference block starts first,
generating stable reference voltage and currents, and then the internal regulator is enabled. The regulator provides
stable supply for the remaining circuitries. Three events can shut down the chip: EN low, VIN low and thermal
shutdown. In the shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The comp
voltage and the internal supply rail are then pulled down. The floating driver is not subject to this shutdown
command.
HM8116A


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