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MP2365DN Datasheet(PDF) 9 Page - Monolithic Power Systems |
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MP2365DN Datasheet(HTML) 9 Page - Monolithic Power Systems |
9 / 11 page MP2365 – 3A, 28V, 1.4MHz STEP-DOWN CONVERTER MP2365 Rev. 0.91 www.MonolithicPower.com 9 7/10/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. To optimize the compensation components for conditions not listed in Table 3, the following procedure can be used. 1. Choose the compensation resistor (R3) to set the desired crossover frequency. Determine the R3 value by the following equation: FB OUT CS EA C V V G G f 2 C 2 3 R × × × × π = Where fC is the desired crossover frequency. 2. Choose the compensation capacitor (C3) to achieve the desired phase margin. For applications with typical inductor values, setting the compensation zero, fZ1, below one forth of the crossover frequency provides sufficient phase margin. Determine the C3 value by the following equation: C f 3 R 2 4 3 C × × π > 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 1.4MHz switching frequency, or the following relationship is valid: 2 f R 2 C 2 1 S ESR < × × π 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 It is recommended that an external bootstrap diode be added when the system has a 5V fixed input or the power supply generates a 5V output. This helps improve the efficiency of the regulator. The bootstrap diode can be a low cost one such as IN4148 or BAT54. MP2365 SW BS 10nF 5V Figure 2—External Bootstrap Diode This diode is also recommended for high duty cycle operation (when IN OUT V V >65%) and high output voltage (VOUT>12V) applications. |
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