Moteur de recherche de fiches techniques de composants électroniques |
|
SPI-8001TW-TL Fiches technique(PDF) 6 Page - Allegro MicroSystems |
|
SPI-8001TW-TL Fiches technique(HTML) 6 Page - Allegro MicroSystems |
6 / 10 page SPI-8001TW Dual 1.5 A, DC/DC Step-Down Converter 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Switching Regulators 6 APPLICATIONS INFORMATION Input Capacitors (C1 and C6). Capacitors with low impedance for high-frequency ripple current must be used. Output Capacitors (C2, C3, C7, and C8). Capacitors with low impedance for high-frequency ripple current must be used. Especially when the C2 and C3 impedance is high, the switching waveform may not be normal at low temperatures. Film or tantalum capacitors for C2 and C3 may cause abnormal oscillations. Catch Diodes (D1 and D2). Diode D1 and D2 must be Schottky diodes. Other diode types will result in increased forward voltage spikes, reverse current flow, increased IC power dissipation during the off period, and possible destruction of the IC. Choke Coils (L1 and L2). If the winding resistance of the choke coil is too high, the circuit efficiency will de- crease. As the overcurrent protection start current is approximately 2 A, attention must be paid to the heating of the coil by magnetic saturation due to overload. To reduce the output ripple, the inductor may be increased at the expense of excessive board area and cost. Output Voltage Adjustable Resistors (R1, R2, R3, and R4). The output voltages are adjusted by R1 and R3. 1000 Ω for R2 and R4 is recommended. R1 = (V O1 – Vref)/(Vref/R2) R3 = (V O2 – Vref)/(Vref/R4) Soft-Start Capcitors (C4 and C5). Soft start for each converter channel is enabled by connecting a capacitor between terminal 6 and/or 11 and ground. The channel may be turned off by decreasing the terminal 6 and/or 11 voltage below 0.5 V with either an npn small-signal transis- tor or the output of open-collector TTL. If both a large soft-start capacitor and on/off control are desired, collector current limiting (R5 and R6) must be used to prevent transistor damage. No external voltage can be applied to terminal 6 or 11. C1 220 µF/63 V C2, C3 470 µF/25 V C4, C5 1 µF C6, C7, C8 0.1 µF R5, R6 1 k Ω L1, L2 47 µH D1, D2 Sanken SFPB-66 Typical Application |
Numéro de pièce similaire - SPI-8001TW-TL |
|
Description similaire - SPI-8001TW-TL |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |