Os motores de busca de Datasheet de Componentes eletrônicos |
|
W-52 Folha de dados(PDF) 7 Page - Copal Electronics |
|
W-52 Folha de dados(HTML) 7 Page - Copal Electronics |
7 / 11 page W-52 7 Application Information Inductor Selection and Efficiency Inductor vendors are shown below. Contact the manufacturer for detailed technical data and new product information. Table 5. INDUCTOR MANUFACTURERS Inductor L ( H) Maximum DCR (m ) Maximum Height (mm) Vendor Web ELJEA4R7 4.7 180 2.2 Panasonic 714.373.7334 www.panasonic.com ELJEA6R8 6.8 250 2.2 LQH3C4R7M24, 4.7 260 2.2 Murata 770.436.1300 www.murata.com LQH32CN4R7M11 LQH3C100K24, 10 300 2.2 LQH32CN100K11 LB2016B4R7 4.7 250 2.0 Taiyo Yuden 408.573.4150 www.t yuden.com LB2016B100 3.8 350 2.0 CMD4D06 4R7 4.7 216 0.8 Sumida 847.956.0666 www.sumida.com CMD4D06 6R8 6.8 296 0.8 CLQ4D10 4R7 4.7 162 1.2 CLQ4D10 6R8 6.8 195 1.2 Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used at the output to minimize the output ripple voltage. The low ESR and small package options available with multilayer ceramic capacitors make them excellent choices. The X5R and X7R capacitor types are preferred because they retain their capacitance over wider voltage and temperature ranges than the Y5V or Z5U types. A 1.0 F or 2.2 F output capacitor is recommended for most applications. The voltage rating of the output capacitor C2 depends on the number of LEDs driven in series. A 10 V ceramic capacitor is recommended when driving two LEDs. A 16 V ceramic capacitor is recommended when driving 3 or 4 LEDs. Table 6. CERAMIC CAPACITOR MANUFACTURERS Supplier Phone Web Taiyo Yuden 408.573.4150 www.t yuden.com Murata 814.237.1431 www.murata.com Kemet 408.986.0424 www.kemet.com Low profile ceramic capacitors with a 1 mm maximum height/thickness are available for designs height requirements. Ceramic capacitors also make a good choice for the input capacitor, which should be mounted as close as possible to the W-52. A 2.2 For 4.7 F input capacitor is recommended. Table 6 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers for detailed information as new products and package options are introduced regularly. Diode Selection Schottky diodes, with their low forward voltage drop and fast switching speed, are the ideal choice for high efficiency applications. Table 7 shows several different Schottky diodes that work well with the W-52. Make sure that the diode has a voltage rating greater than the output voltage. The diode conducts current only when the power switch is turned off (typically less than one third the time), so a 0.4 A or 0.5 A diode will be sufficient for most designs. Table 7. SCHOTTKY DIODE SUPPLIERS Part Supplier MBR0520 ON Semiconductor www.onsemi.com 800.282.9855 MBR0530 s MBR0540 ZHCS400 Zetex LED Current Programming The LED current is programmed with a single resistor connected to the RSET pin. The RSET pin is internally regulated to 100 mV, which sets the current flowing out of this pin, ISET, equal to 100 mV/RSET. The W-52 regulates the current into the LED pin, ILED, to 225 times the value of ISET. For the best accuracy, a 1% or better resistor is recommended. Table 8 shows several typical 1% RSET values. |
Nº de peça semelhante - W-52 |
|
Descrição semelhante - W-52 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | 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 |