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MP1472 数据表(PDF) 10 Page - Monolithic Power Systems |
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MP1472 数据表(HTML) 10 Page - Monolithic Power Systems |
10 / 13 page MP1472 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER MP1472 Rev. 1.0 www.MonolithicPower.com 10 9/2/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3. Determine if the second compensation capacitor (C6) is required. It is required if the ESR zero of the output capacitor is located at less than half of the switching frequency, or the following relationship is valid: S ESR f 1 2C2 R 2 If this is the case, then add the second compensation capacitor (C6) to set the pole fP3 at the location of the ESR zero. Determine the C6 value by the equation: 3 R R 2 C 6 C ESR External Bootstrap Diode An external bootstrap diode may enhance the efficiency of the regulator, and it will be a must if the applicable condition is: VOUT=5V or 3.3V; and duty cycle is high: D= IN OUT V V >65% In these cases, an external BST diode is recommended from the output of the voltage regulator to BST pin, as shown in Figure 2 MP1472 SW BST C L BST C 5V or 3.3V OUT External BST Diode IN4148 + 0.01 Figure 2—Add Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST cap is 0.01µF. |
类似零件编号 - MP1472 |
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类似说明 - MP1472 |
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