Motore di ricerca datesheet componenti elettronici |
|
MP1601 Scheda tecnica(PDF) 18 Page - Monolithic Power Systems |
|
MP1601 Scheda tecnica(HTML) 18 Page - Monolithic Power Systems |
18 / 20 page MP1601 – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER WITH 11µA IQ MP1601 Rev. 1.0 www.MonolithicPower.com 18 3/24/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. The input capacitor can be electrolytic, tantalum, or ceramic. When using electrolytic or tantalum capacitors, add a small, high-quality ceramic 0.1μF 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 SIN IV V V1 fC1 V V (7) Selecting the Output Capacitor The output capacitor (C2) stabilizes the DC output voltage. Ceramic capacitors are recommended. For best results, use low ESR capacitors to limit the output voltage ripple. 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 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 S1 IN VV ∆V1 8f 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 ∆V1 R fL V (10) The characteristics of the output capacitor also 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 11 and follow the guidelines below. 1. Place the high-current paths (GND, IN, and SW) very close to the device with short, direct, and wide traces. 2. Place the input capacitor as close to IN 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 keep it away from the power inductor. Figure 11: Two Ends of the Input Decoupling Capacitor Close to Pin 2 and Pin 3 |
Codice articolo simile - MP1601 |
|
Descrizione simile - MP1601 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |