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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2545 датащи(PDF) 1 Page - Semtech Corporation |
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SC2545 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 24 page  1 www.semtech.com SC2545 High Performance Wide Input Range Dual Synchronous Buck Controller POWER MANAGEMENT Revision: August 10, 2005 Description Features Typical Application Circuit Independent dual-outputs “ Peel off “start up trackingIndependent dual-outputs Wide input voltage range: 4.5V~28V Adjustable output voltage down to 0.75V Flexible power sequencing with enable and power good output Synchronous Buck topology with voltage mode control Out of phase operation to reduce cost of input capacitor 10V internal regulator for gate driver to deliver high efficiency Programmable switching frequency: 100kHz~300kHz Full protection: UVLO, OVP and programmable OCP No need for current sense resistor Low shutdown current (100nA typical) 24 lead TSSOP and MLPQ packages Fully WEEE and RoHS Compliant Applications Systems with 4.5V~28V input LCDTV and PDPTV Network and telecom systems Pinout shown as TSSOP-24. The SC2545 is a high performance dual PWM controller. It is designed to convert a wide ranged input voltage down to two independent output rails. The SC2545 support “ peel off ” tracking for the two outputs at start up which means the two outputs ramp up together till the one with lower output level reaching the regulation. The PWM operations of the two channels are 180 degree out of phase which can greatly reduce the size and the cost of the input capacitors. Synchronous Buck PWM topology and voltage mode control allow high efficiency operation, fast transient responses, and flexible component selec- tion for easy designs. A 10V internal linear regulator pro- vides the bias for the controller, and this voltage is opti- mized for gate drivers to deliver high efficiency. The power sequencing is fully supported including independent start up, and power good output. In the shut down mode the controller only draws 100nA from the supply. The con- troller also offers full protection features for the condi- tions of under voltage, over voltage, and the over current. There is no need for a current sensing resistor because the MOSFET on resistance is used for the sensing element. The switching frequency is adjustable from 100 kHz to 300 kHz. Two packages TSSOP-24 and MLPQ-24 are offered. VO1 VIN+ VO1 VIN+ FB1 FB1 PWGRD FB2 FB2 VCC VCC ENABLE VO2 VIN 1 VCC 2 EN 3 FB1 4 ERROUT1 5 SS1 6 ILIM1 7 BST1 8 DRVH1 9 PHASE1 10 DRVL1 11 AGND 24 ROSC 23 PWRGD 22 FB2 21 ERROUT2 20 SS2 19 ILIM2 18 DRVH2 16 DRVL2 14 PVCC 13 PGND 12 PHASE2 15 BST2 17 SC2545 VIN+ |
Аналогичный номер детали - SC2545 |
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Аналогичное описание - SC2545 |
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