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MP2159A Fiches technique(PDF) 13 Page - Monolithic Power Systems |
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MP2159A Fiches technique(HTML) 13 Page - Monolithic Power Systems |
13 / 15 page MP2159A – 1 A, 6 V, 1.5 MHz SYNCHRONOUS STEP-DOWN CONVERTER MP2159A Rev. 1.02 www.MonolithicPower.com 13 6/30/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. Selecting the Output Capacitor The output capacitor (C2) is required to maintain the DC output voltage. Ceramic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. The output voltage ripple can be estimated using Equation (8): OUT OUT OUT ESR S1 IN S VV 1 V1 R fL V 8 f C2 (8) Where L1 is the inductor value and RESR is the equivalent series resistance (ESR) value of the output capacitor. When using ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. The output voltage ripple is caused mainly by the capacitance. For simplification, the output voltage ripple can be estimated using Equation (9): OUT OUT OUT 2 IN S1 VV ΔV1 V 8f L C2 (9) When using tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated with Equation (10): OUT OUT OUT ESR IN S1 VV ΔV1 R fL V (10) The characteristics of the output capacitor affect the stability of the regulation system. PCB Layout Guidelines Efficient PCB layout is critical for stable operation. For the high-frequency switching converter, a poor layout design can result in poor line or load regulation and stability issues. For best results, refer to Figure 3 and follow the guidelines below: 1. Place the high current paths (GND, VIN, and SW) very close to the device with short, direct, and wide traces. 2. Place the input capacitor as close as possible to VIN and GND. 3. Place the external feedback resistors next to FB. 4. Keep the switching node (SW) short and away from the feedback network. 8 7 6 5 L1 R4 R3 1 2 3 4 OUT VIN GND SW C1 C1A Figure 3—Recommended PCB layout Design Example Table 2 shows a design example following the application guidelines for the given specifications: Table 2—Design example VIN 5 V VOUT 1.2 V fSW 1500 kHz The detailed application schematic is shown in Figure 4. The typical performance and circuit waveforms have been shown in the “Typical Performance Characteristics” section. For more device applications, please refer to the related evaluation board datasheets. |
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