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MP1497S Scheda tecnica(PDF) 10 Page - Monolithic Power Systems |
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MP1497S Scheda tecnica(HTML) 10 Page - Monolithic Power Systems |
10 / 15 page MP1497S – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS MP1497S Rev. 1.01 www.MonolithicPower.com 10 9/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. limit threshold. Under-voltage protection (UVP) triggers if the FB voltage drops below the under-voltage (UV) threshold—typically 50% below the reference. Once UVP triggers, the MP1497S enters hiccup mode to periodically restart the part. This protection mode is especially useful when the output is dead- shorted to ground. The average short-circuit current falls to alleviate thermal issues and to protect the regulator. The MP1497S exits hiccup mode once the over-current condition is removed. Thermal Shutdown Thermal shutdown prevents the chip from operating at exceedingly high temperatures. When the silicon die temperature exceeds 150°C, it shuts down the whole chip. When the temperature drops below its lower threshold (typically 130°C) the chip is enabled again. Floating Driver and Bootstrap Charging An external bootstrap capacitor powers the floating power MOSFET driver. This floating driver has its own UVLO protection with a rising threshold of 2.2V and a hysteresis of 150mV. The bootstrap capacitor voltage is regulated internally by VIN through D1, M1, C4, L1 and C2 (Figure 3). If (VIN-VSW) exceed 5V, U1 will regulate M1 to maintain a 5V BST voltage across C4. A 10Ω resistor placed between SW and BST cap is strongly recommended to reduce SW spike voltage. Figure 3: Internal Bootstrap Charging Circuit, Startup and Shutdown If both VIN and EN exceed 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. For 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. |
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