 |
Motore di ricerca datesheet componenti elettronici |
|
|
Motore di ricerca datesheet componenti elettronici |
|
SC1485 Scheda tecnica(PDF) 1 Page - Semtech Corporation |
|
|
|||||||||||||||||||||||||||||
SC1485 Scheda tecnica(HTML) 1 Page - Semtech Corporation |
|
|
1 / 17 page  1 www.semtech.com SC1485 Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller POWER MANAGEMENT Revision: October 14, 2004 Description Features Applications Typical Application Circuit The SC1485 is a dual output constant on synchronous- buck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on time. The excellent transient response, means that SC1485 based solutions will require less output capacitance than competing fixed frequency converters. The frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage. After the transient event, the controller frequency will return to steady state operation. At light loads, Power-Save Mode enables the SC1485 to skip PWM pulses for better efficiency. Each output voltage can be independently adjusted from 0.5V to VCCA. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over-voltage and under- voltage protection, and a PGOOD output for each controller. Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies Constant on-time for fast dynamic response Programmable VOUT range = 0.5 – VCCA VIN Range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or sense resistor Resistor programmable frequency Cycle-by-cycle current limit Digital soft-start Separate PSAVE option for each switcher Over-voltage/Under-voltage fault protection 10uA Typical shutdown current Low quiescent power dissipation Two PGOOD indicators 1% Reference (2% system DC accuracy) Efficiency >90% Integrated gate drivers with soft switching Separate enables 28 Lead TSSOP Industrial temperature range VBAT SC1485 1 2 4 5 6 9 12 13 15 16 18 19 20 22 23 26 27 8 PGND1 DL1 ILIM1 LX1 DH1 TON2 FBK2 PGOOD2 PGND2 DL2 ILIM2 LX2 DH2 EN/PSV1 TON1 FBK1 PGOOD1 EN/PSV2 VOUT2 PGND1 R3 R7 PGOOD1 EN1 R5 PGOOD2 PGND1 Q2 + C7 R8 R2 R6 R1 Q1 L2 Q3 VBAT VOUT1 R4 EN2 L1 + C8 Q4 |
Codice articolo simile - SC1485 |
|
Descrizione simile - SC1485 |
|
|
|
Link URL |
| Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | Collegamento alla scheda tecnica | 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 |
Italian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
