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LM2738 데이터시트(PDF) 10 Page - Texas Instruments |
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LM2738 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 40 page 0 0 VIN VD TON t t Inductor Current D = TON/TSW VSW TOFF TSW IL IPK SW Voltage 10 LM2738 SNVS556C – APRIL 2008 – REVISED JANUARY 2016 www.ti.com Product Folder Links: LM2738 Submit Documentation Feedback Copyright © 2008–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM2738 is a constant frequency PWM buck regulator device that delivers a 1.5-A load current. The regulator has a preset switching frequency of either 550 kHz (LM2738Y) or 1.6 MHz (LM2738X). These high frequencies allow the LM2738 to operate with small surface-mount capacitors and inductors, resulting in DC-DC converters that require a minimum amount of board space. The LM2738 is internally compensated, so it is simple to use and requires few external components. The LM2738 uses current-mode control to regulate the output voltage. The LM2738 supplies a regulated output voltage by switching the internal NMOS control switch at constant frequency and variable duty cycle. A switching cycle begins at the falling edge of the reset pulse generated by the internal oscillator. When this pulse goes low, the output control logic turns on the internal NMOS control switch. During this on time, the SW pin voltage (VSW) swings up to approximately VIN, and the inductor current (IL) increases with a linear slope. IL is measured by the current-sense amplifier, which generates an output proportional to the switch current. The sense signal is summed with the regulator’s corrective ramp and compared to the error amplifier’s output, which is proportional to the difference between the feedback voltage and VREF. When the PWM comparator output goes high, the output switch turns off until the next switching cycle begins. During the switch off-time, inductor current discharges through Schottky diode D1, which forces the SW pin to swing below ground by the forward voltage (VD) of the catch diode. The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage. See Functional Block Diagram and Figure 25. Figure 25. LM2738 Waveforms of SW Pin Voltage and Inductor Current |
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유사한 설명 - LM2738_16 |
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