Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
LM2842YQMKX/NOPB Datasheet(PDF) 9 Page - Texas Instruments |
|
|
LM2842YQMKX/NOPB Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page FB GND SW CB SHDN LM2840/1/2-ADJL 3.3V OUT 4.5V to 42V IN D1 MA2YD26 R1 3.4k R2 1.02k CBOOT VIN CIN 2.2 PF 0.1 PF L1 15 PH COUT 10 PF LM2841, LM2842 www.ti.com SNVS540H – MARCH 2009 – REVISED APRIL 2013 SCHOTTKY DIODE The breakdown voltage rating of the diode (D1) is preferred to be 25% higher than the maximum input voltage. The current rating for the diode should be equal to the maximum output current for best reliability in most applications. In cases where the duty cycle is greater than 50%, the average diode current is lower. In this case it is possible to use a diode with a lower average current rating, approximately (1-D)IOUT, however the peak current rating should be higher than the maximum load current. A 0.5A to 1A rated diode is a good starting point. LAYOUT CONSIDERATIONS To reduce problems with conducted noise pick up, the ground side of the feedback network should be connected directly to the GND pin with its own connection. The feedback network, resistors R1 and R2, should be kept close to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin. The input bypass capacitor CIN must be placed close to the VIN pin. This will reduce copper trace resistance which effects input voltage ripple of the IC. The inductor L1 should be placed close to the SW pin to reduce EMI and capacitive coupling. The output capacitor, COUT should be placed close to the junction of L1 and the diode D1. The L1, D1, and COUT trace should be as short as possible to reduce conducted and radiated noise and increase overall efficiency. The ground connection for the diode, CIN, and COUT should be as small as possible and tied to the system ground plane in only one spot (preferably at the COUT ground point) to minimize conducted noise in the system ground plane. For more detail on switching power supply layout considerations see Application Note AN- 1149: Layout Guidelines for Switching Power Supplies SNVA021. Application Information Figure 14. Application Circuit, 3.3V Output @ 100 mA Table 1. Some Recommended Inductors (Others May Be Used) Manufacturer Inductor Contact Information Coilcraft LPS4018, DO1608C, DO3308, and LPO2506 series www.coilcraft.com 800-3222645 MuRata LQH55D and LQH66S series www.murata.com Coiltronics MP2 and MP2A series www.cooperbussman.com Table 2. Some Recommended Input And Output Capacitors (Others May Be Used) Manufacturer Capacitor Contact Information Vishay Sprague 293D, 592D, and 595D series tantalum www.vishay.com 407-324-4140 Taiyo Yuden High capacitance MLCC ceramic www.t-yuden.com 408-573-4150 ESRD seriec Polymer Aluminum Electrolytic Cornell Dubilier www.cde.com SPV and AFK series V-chip series MuRata High capacitance MLCC ceramic www.murata.com Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2841 LM2842 |
Número de pieza similar - LM2842YQMKX/NOPB |
|
Descripción similar - LM2842YQMKX/NOPB |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |