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MP2234 Arkusz danych(PDF) 16 Page - Monolithic Power Systems |
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MP2234 Arkusz danych(HTML) 16 Page - Monolithic Power Systems |
16 / 21 page MP2234 – SYNCHRONOUS STEP-DOWN CONVERTER MP2234 Rev. 1.0 www.MonolithicPower.com 16 5/16/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. External Bootstrap Diode An external bootstrap diode can enhance the efficiency of the regulator given the following conditions: VOUT is 5V or 3.3V; and Duty cycle is high: D= IN OUT V V >65% In these cases, add an external BST diode from the VCC pin to BST pin, as shown in Figure 8. Figure 8: Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST capacitor value is 0.1µF to 1 μF. |
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