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MP174 Fiches technique(PDF) 13 Page - Monolithic Power Systems |
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MP174 Fiches technique(HTML) 13 Page - Monolithic Power Systems |
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13 / 22 page ![]() MP174 – NON-ISOLATED OFF-LINE REGULATOR MP174 Rev. 1.01 www.MonolithicPower.com 13 8/18/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. Open-Loop Detection If VFB is less than 0.5V, the IC will stop switching and a re-start cycle will begin. During Soft-Start, the open loop detection is blanked. Leading-Edge Blanking An internal leading-edge blanking (LEB) unit avoids premature switching pulse termination due to turn on spike. Turn on spike is caused by parasitic capacitance and reverse recovery of freewheeling diode. During the blanking time, the current comparator is disabled and can not turn off the external MOSFET. Figure 5shows the leading-edge blanking. ILIMIT 350ns IDS t Figure 5: Leading-Edge Blanking |
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