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LM2830XMF 데이터시트(PDF) 9 Page - Texas Instruments |
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LM2830XMF 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 37 page 0 0 VIN VD TON t t Inductor Current D = TON/TSW VSW TOFF TSW IL IPK SW Voltage LM2830, LM2830-Q1 www.ti.com SNVS454E – AUGUST 2006 – REVISED DECEMBER 2014 7 Detailed Description 7.1 Overview The LM2830 device is a constant frequency PWM buck regulator IC that delivers a 1.0-A load current. The regulator has a preset switching frequency of 1.6 MHz or 3.0 MHz. This high frequency allows the LM2830 device to operate with small surface-mount capacitors and inductors, resulting in a DC-DC converter that requires a minimum amount of board space. The LM2830 device is internally compensated, so it is simple to use and requires few external components. The LM2830 device uses current-mode control to regulate the output voltage. The following operating description of the LM2830 device will refer to the Simplified Block Diagram (Functional Block Diagram) and to the waveforms in Figure 18. The LM2830 device supplies a regulated output voltage by switching the internal PMOS 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 PMOS 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 the Schottky catch diode, which forces the SW pin to swing below ground by the forward voltage (VD) of the Schottky catch diode. The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage. Figure 18. Typical Waveforms Copyright © 2006–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2830 LM2830-Q1 |
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