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LM4510SDXNOPB Datasheet(PDF) 10 Page - Texas Instruments |
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LM4510SDXNOPB Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page OFF ON ON OFF + - +- PWM NMOS PMOS VOUT GND VSW1 + - COUT RLOAD LM4510 SNVS533C – SEPTEMBER 2007 – REVISED MAY 2013 www.ti.com OPERATION IN SYNCHRONOUS CONTINUOUS CONDUCTION MODE (CYCLE 1, CYCLE 2) Figure 24. Schematic of Synchronous Boost Converter Synchronous boost converter is shown in Figure 24. At the start of each cycle, the oscillator sets the driver logic and turns on the NMOS power device and turns off the PMOS power device. Cycle 1 Description Refer to Figure 25. NMOS switch turn-on → Inductor current increases and flows to GND. PMOS switch turn-off → Isolate VOUT from SW → Output capacitor supplies load current. Figure 25. Equivalent Circuit During Cycle 1 During operation, EAMP output voltage (VCOMP) increases for larger loads and decreases for smaller loads. When the sum of the ramp compensation and the sensed NMOS current reaches a level determined by the EAMP output voltage, the PWM COMP resets the logic, turning off the NMOS power device and turning on the PMOS power device. Cycle 2 Description Refer to Figure 26. NMOS Switch turn-off → PMOS Switch turn-on→ Inductor current decreases and flows through PMOS → Inductor current recharges output capacitor and supplies load current. Figure 26. Equivalent Circuit During Cycle 2 After the switching period the oscillator then sets the driver logic again repeating the process. 10 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM4510 |
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