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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC1470ITSTRT датащи(PDF) 1 Page - Semtech Corporation |
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SC1470ITSTRT датащи(HTML) 1 Page - Semtech Corporation |
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1 / 25 page  1 www.semtech.com SC1470 Synchronous Buck Pseudo Fixed Frequency Power Supply Controller POWER MANAGEMENT Revision: April 29, 2005 Applications Typical Application Circuit The SC1470 is a single output, constant on-time synchronous-buck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and fast dynamic response with no minimum on time. The excellent transient response means that SC1470 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 SC1470 to skip PWM pulses for better efficiency. The output voltage can be adjusted from 0.5V to VCCA. A frequency setting resistor sets the on-time for flexibility in choosing filter components. 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 Power Good output. 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 VBAT 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 Combined EN and PSAVE functions Over-voltage/under-voltage fault protection and Power Good output 10µA typical shutdown current Low quiescent power dissipation 14 Lead TSSOP package Industrial temperature range 1% Internal reference (2% system DC accuracy) Integrated gate drivers with soft switching Description Features 5VSUS 5VSUS VBAT R3 R1 RTON PGOOD R4 C4 1uF VOUT R6 L1 R5 C2 10uF U1 SC1470 1 2 3 4 5 6 7 8 9 10 11 12 13 14 EN/PSV TON VOUT VCCA FB PGD VSSA PGND DL VDDP ILIM LX DH BST C6 1uF VOUT D1 R2 10R VBAT + C3 Q2 C1 0.1uF Q1 C5 1nF |
Аналогичный номер детали - SC1470ITSTRT |
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Аналогичное описание - SC1470ITSTRT |
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