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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SP6121 датащи(PDF) 1 Page - Sipex Corporation |
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SP6121 датащи(HTML) 1 Page - Sipex Corporation |
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1 / 42 page  Date: 11/29/04 SP6121 Low Voltage, Synchronous Step Down PWM Controller © Copyright 2004 Sipex Corporation 1 SP6121 ■ Optimized for Single Input Voltage - 3V to 5.5V ■ High Efficiency: Greater than 95% possible ■ Accurate, 500kHz Fixed Frequency Operation ■ Fast Transient Response ■ 500µA, IQ (25µA in Shutdown) ■ Internal, 0.4 V/ms, Soft Start Circuit ■ Precision 1% Reference ■ Resistor Programmable Output Voltage ■ Lossless Adjustable Current Limit with ■ High Side RDS(ON) Sensing ■ 0% to 100% Duty Cycle Range ■ High Side PMOS Switch Negates Need for ■ External Charge Pump ■ Output Over Voltage Protection ■ Hiccup Mode Current Limit Protection Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters APPLICATIONS ■ Supply Bias for - DSP - Microprocessor Core - I/O & Logic ■ Video Cards ■ Board Level Supply in Distributed Power Systems ® DESCRIPTION The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to work from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiency power conversion. The operating frequency is internally set at 500kHz, permitting the use of small, surface mount inductors and capacitors. Requiring only few external components, the SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost, small size and high efficiency are critical. With its low voltage capability and inherent 100% duty cycle operation, the SP6121 allows low dropout operation in the event of a low input supply voltage condition. Q1 = FAIRCHILD FDS6375 Q2 = FAIRCHILD FDS6690A DS = STMICROELECTRONICS STPS2L25BU L1 = PANASONIC ETQ-P6F1R6SFA C OUT = SANYO 4TPB470M VCC CB 3.3µF CIN 47µF Ceramic 6.3V ISET 3.3V VIN PDRV GND COMP SP6121 U1 ® ® VFB NDRV ISENSE CP 50pF RZ 10k VOUT 1.8µH L1 COUT 470µF x 2 RSET 2.3k 1.9V 8A Q1 CZ 3.7nF Q2 RVCC 5 DS R1 5.2k R2 10k FEATURES TYPICAL APPLICATION CIRCUIT Now Available in Lead Free Packaging 1 2 3 4 5 6 7 8 SP6121 8 Pin nSOIC COMP VFB GND PDRV NDRV ISET ISENSE VCC |
Аналогичный номер детали - SP6121 |
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Аналогичное описание - SP6121 |
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