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MP1601A Arkusz danych(PDF) 15 Page - Monolithic Power Systems |
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MP1601A Arkusz danych(HTML) 15 Page - Monolithic Power Systems |
15 / 17 page MP1601A – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER IN A SOT563 MP1601A Rev. 1.0 www.MonolithicPower.com 15 9/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. For simplification, choose an input capacitor with an RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum, or ceramic. When using electrolytic or tantalum capacitors, add a small, high-quality, 0.1μF, ceramic capacitor as close to the IC as possible. When using ceramic capacitors, ensure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. The input voltage ripple caused by capacitance can be estimated with Equation (7): LOAD OUT OUT IN IN S IN I V V V1 f C1 V V (7) Selecting the Output Capacitor The output capacitor (C2) stabilizes the DC output voltage. Low ESR ceramic capacitors are recommended to limit the output voltage ripple. Estimate the output voltage ripple with Equation (8): OUT OUT OUT ESR S 1 IN S VV 1 V 1 R f L 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 capacitance dominates the impedance at the switching frequency and causes most of the output voltage ripple. For simplification, the output voltage ripple can be estimated with Equation (9): OUT OUT OUT 2 S 1 IN VV ΔV1 8 f L C2 V (9) For 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 ΔV 1 R f L V (10) The characteristics of the output capacitor also affect the stability of the regulation system. PCB Layout Guidelines Efficient layout of the switching power supplies is critical for stable operation. For the high- frequency switching converter, 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. 5. Keep the VOUT sense line as short as possible or away the from power inductor and surrounding inductors. LOUT G N D COUT GND R2 VIN VOUT EN CIN 1 2 3 4 5 6 VIN EN OUT FB GND SW R1 Figure 3: Two Ends of Input Decoupling Capacitor Close to Pin 2 and Pin 3 |
Podobny numer części - MP1601A |
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Podobny opis - MP1601A |
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