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LM2705MF-ADJ Datasheet(PDF) 7 Page - Texas Instruments |
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LM2705MF-ADJ Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page + - V OUT R2 50k SW FB GND SHDN Current Sensing Circuitry Under Voltage Lockout 400ns One Shot CL Adjust CL Comp R1 50k Q1 Q2 10x R3 30k R4 140k Driver 2 4 5 3 1 Logic R F2 R F1 Enable Comp V OUT C OUT L D V IN C IN V IN Enable LM2705 www.ti.com SNVS191E – NOVEMBER 2002 – REVISED MAY 2013 OPERATION Figure 15. LM2705 Block Diagram VOUT = 20V, VIN = 2.7V, IOUT = 2.5mA 1) VSW, 20V/div, DC 2) Inductor Current, 100mA/div, DC 3) VOUT, 200mV/div, AC T = 10µs/div Figure 16. Typical Switching Waveform The LM2705 features a constant off-time control scheme. Operation can be best understood by referring to Figure 15 and Figure 16. Transistors Q1 and Q2 and resistors R3 and R4 of Figure 15 form a bandgap reference used to control the output voltage. When the voltage at the FB pin is less than 1.237V, the Enable Comp in Figure 15 enables the device and the NMOS switch is turned on pulling the SW pin to ground. When the NMOS switch is on, current begins to flow through inductor L while the load current is supplied by the output capacitor COUT. Once the current in the inductor reaches the current limit, the CL Comp trips and the 400ns One Shot turns Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2705 |
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