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HM8119 Folha de dados(PDF) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

Nome de Peças HM8119
Descrição Electrónicos  Standoff 55V 500mA 850KHz Sync Step-Down Regulator
Download  13 Pages
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Fabricante Electrônico  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
Página de início  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM8119 Folha de dados(HTML) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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Standoff 55V 500mA 850KHz Sync Step-Down Regulator
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Over Current Protection
The HM8119 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. Once
a UV is triggered, the HM8119 enters hiccup mode to periodically restart the part. This protection mode is especially
useful when the output is dead-short to ground. The average short circuit current is greatly reduced to alleviate the
thermal issue and to protect the regulator. The HM8119 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.
HM8119


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