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MP2158A Fiches technique(PDF) 12 Page - Monolithic Power Systems |
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MP2158A Fiches technique(HTML) 12 Page - Monolithic Power Systems |
12 / 14 page MP2158A – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN CONVERTER MP2158A Rev. 1.02 www.MonolithicPower.com 12 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, low ESR capacitors are recommended to keep the output voltage ripple low. The output voltage ripple can be estimated with 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, which mainly causes output voltage ripples. For simplification, the output voltage ripple can be estimated with 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 achieving stable operation. 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) as close to the device as possible with short, direct, and wide traces. 2. Place the input capacitor as close to VIN and GND as possible. 3. Place the external feedback resistors next to FB. 4. Keep the switching node (SW) short and away from the feedback network. EN GND OUT SW VIN 1 2 3 4 8 7 6 5 PG R1 C2 R2 C1 Figure 3: Recommended PCB Layout Design Example Below is a design example following the application guidelines for the specifications: Table 2: Design Example VIN 5V VOUT 1.2V fSW 1500kHz The detailed application schematic is shown in Figure 4. The typical performance and circuit waveforms are shown in the Typical Performance Characteristics section on page 4. For more device applications, please refer to the related evaluation board datasheets. |
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