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HM8119 Folha de dados(PDF) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd |
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HM8119 Folha de dados(HTML) 8 Page - Shenzhen Huazhimei Semiconductor Co., Ltd |
8 / 13 page Standoff 55V 500mA 850KHz Sync Step-Down Regulator Page 8 / 13 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 |
Nº de peça semelhante - HM8119 |
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Descrição semelhante - HM8119 |
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