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AME5140AEEAADJZ3 Datasheet(PDF) 11 Page - Analog Microelectronics |
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AME5140AEEAADJZ3 Datasheet(HTML) 11 Page - Analog Microelectronics |
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11 / 22 page  AME, Inc. 11 AME5140 1.6 MHz Boost Converter With 30V Internal FET Switch Rev.G.01 n Application Hints Feed-Forward Compensation Although internally compensated, the feed-forward ca- pacitor Cf is required for stability. Adding this capacitor puts a zero in the loop response of the Converter. The recommended frequency for the zero fz should be ap- proximately 6kHz. Cf can be calculated using the for- mula: Cf = 1 / (2 x π x R1 x fz) Selecting Diodes The external diode used in the typical application should be a Schottky diode. A 20V diode such as the MBR0520 is recommended. The MBR05XX series of diodes are designed to handle a maximum average current of 0.5A. For applications exceeding 0.5A average but less than 1A, a Microsemi UPS5817 can be used. Layout Hints High frequency switching regulators require very care- ful layout of components in order to get stable operation and low noise. All components must be as close as pos- sible to the AME5140 device. It is recommended that a 4-layer PCB be used so that internal ground planes are available. As an example, a recommended layout of com- ponents is shown: Recommended PCB Component Layout (Top) Layout Hints Recommended PCB Component Layout (Bottom) Some additional guidelines to be observed: 1. Keep the path between L1, D1, and C2 extremely short. Parasitic trace inductance in series with D1 and C2 will increase noise and ringing. 2. The feedback components R1, R2 and CF must be kept close to the FB pin of U1 to prevent noise injection on the FB pin trace. 3. If internal ground planes are available use vias to con- nect directly to ground at pin 2 of U1, as well as the nega- tive sides of capacitors C1 and C2. Duty Cycle The maximum duty cycle of the switching regulator de- termines the maximum boost ratio of output-to-input volt- age that the converter can attain in mode of operation. The duty cycle for a given boost application is defined as: This applies for continuous mode operation. V OUT + VDIODE - VIN V OUT + VDIODE - VSW D = |
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