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LT3579 Arkusz danych(PDF) 1 Page - Linear Technology |
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LT3579 Arkusz danych(HTML) 1 Page - Linear Technology |
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1 / 40 page  LT3579/LT3579-1 1 35791f TYPICAL APPLICATION DESCRIPTION 6A Boost/Inverting DC/DC Converter with Fault Protection The LT®3579 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltage, and overtemperature conditions. Thepartconsistsofa42Vmasterswitch,anda42Vslaveswitch that can be tied together for a total current limit of 6A. The LT3579 is ideal for many local power supply designs. It canbeeasilyconfiguredinBoost,SEPIC,Inverting,orFlyback configurations, and is capable of generating 12V at 1.7A, or –12V at 1.2A from a 5V input. In addition, the LT3579’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are very efficient and require fewer components than traditional circuits. The LT3579’s switching frequency range can be set between 200kHz and 2.5MHz. The part may be clocked internally at a frequency set by the resistor from the RT pin to ground, or it may be synchronized to an external clock. A buffered version of the clock signal is driven out of the CLKOUT pin, and may be used to synchronize other compatible switching regulator ICs to the LT3579. The LT3579 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function. Additional features such as frequency foldback and soft-start are integrated. The LT3579 is available in 20-lead TSSOP and 20-pin 4mm × 5mm QFN packages. 1MHz, 5V to 12V Boost Converter with Output Short Circuit Protection FEATURES APPLICATIONS n 6A, 42V Combined Power Switch n Output Short Circuit Protection n Wide Input Range: 2.5V to 16V Operating, 40V Maximum Transient n LT3579-1: Dual-Phase Capable n Master/Slave (3.4A/2.6A) Switch Design n User Configurable Undervoltage Lockout n Easily Configurable as a Boost, SEPIC, Inverting, or Flyback Converter n Low VCESAT Switch: 250mV at 5.5A (Typical) n Can be Synchronized to External Clock n Can Synchronize other Switching Regulators n High Gain SHDN Pin Accepts Slowly Varying Input Signals n 20-Lead TSSOP and 20-Pin 4mm × 5mm QFN Packages n Local Power Supply n Vacuum Flourescent Display (VFD) Bias Supplies n TFT-LCD Bias Supplies n Automotive Engine Control Unit (ECU) Power L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7579816. VIN 5V 200k 100k 86.6k 22μF 2.2μH SW1 SW2 FB GATE VC CLKOUT VIN VIN RT SYNC GND SS FAULT SHDN 47pF TEMPERATURE MONITOR LT3579 130k 2.2nF 10μF VOUT 12V 1.7A 6.3k 8k 0.1μF 10μF 3579 TA01 Efficiency and Power Loss LOAD CURRENT (A) 0 20 80 90 70 60 50 40 30 100 0 2.4 2.8 2.0 1.6 1.2 0.8 0.4 3.2 0.25 1 1.25 1.5 1.75 2 0.5 35791 TA02 0.75 |
Podobny numer części - LT3579 |
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Podobny opis - LT3579 |
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