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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM2735YMF Fiches technique(PDF) 8 Page - Texas Instruments |
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LM2735YMF Fiches technique(HTML) 8 Page - Texas Instruments |
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8 / 58 page  cv 1.6 MHz S R R Q + - + - EN VIN ThermalSHDN SW ILIMIT NMOS UVLO = 2.3V ISENSE-AMP Internal Compensation Soft-Start Corrective - Ramp Oscillator Control Logic VREF = 1.255V FB GND LM2735 SNVS485F – JUNE 2007 – REVISED APRIL 2013 www.ti.com Simplified Internal Block Diagram Figure 18. Simplified Block Diagram APPLICATION INFORMATION THEORY OF OPERATION The LM2735 is a constant frequency PWM boost regulator IC that delivers a minimum of 2.1A peak switch current. The regulator has a preset switching frequency of either 520 kHz or 1.60 MHz. This high frequency allows the LM2735 to operate with small surface mount capacitors and inductors, resulting in a DC/DC converter that requires a minimum amount of board space. The LM2735 is internally compensated, so it is simple to use, and requires few external components. The LM2735 uses current-mode control to regulate the output voltage. The following operating description of the LM2735 will refer to the Simplified Internal Block Diagram (Figure 18) the simplified schematic (Figure 19), and its associated waveforms (Figure 20). The LM2735 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) decreases to approximately GND, 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 sensed 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 diode D1, which forces the SW pin to swing to the output voltage plus the forward voltage (VD) of the diode. The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage . 8 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM2735 |
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