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MIC2176-2 Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC2176-2 Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 31 page Micrel, Inc. MIC2176 November 2010 3 M9999-111710-A Pin Description (Continued) Pin Number Pin Name Pin Function 9 SW Switch Node and Current-Sense input (Input): High current output driver return. The SW pin connects directly to the switch node. Due to the high-speed switching on this pin, the SW pin should be routed away from sensitive nodes. The SW pin also senses the current by monitoring the voltage across the low-side MOSFET during OFF time. In order to sense the current accurately, connect the low-side MOSFET drain to the SW pin using a Kelvin connection. 10 BST Boost (Output): Bootstrapped voltage to the high-side N-channel internal MOSFET driver. A Schottky diode is connected between the VDD pin and the BST pin. A boost capacitor of 0.1μF is connected between the BST pin and the SW pin. Adding a small resistor in series with the BST pin can slow down the turn-on time of high-side N-Channel MOSFETs. |
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