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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2735 Datenblatt(PDF) 9 Page - Texas Instruments |
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LM2735 Datenblatt(HTML) 9 Page - Texas Instruments |
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9 / 59 page  + - - - Control ( ) t O V ( ) t C I ( ) t L I ( ) t L V 1 D 1 Q ( ) t SW V 1 C 1 L IN V LM2735, LM2735-Q1 www.ti.com SNVS485G – JUNE 2007 – REVISED AUGUST 2015 7 Detailed Description 7.1 Overview The LM2735 device is highly efficient and easy-to-use switching regulator for boost and SEPIC applications. The device provides regulated DC output with fast transient response. Device architecture (current mode control) and internal compensation enable solutions with minimum number of external components. Additionally high switching frequency allows for use of small external passive components (chip capacitors, SMD inductors) and enables power solutions with very small PCB area. LM2735 also provides features such as soft start, pulse-by- pulse current-limit, and thermal shutdown. 7.1.1 Theory of Operation The LM2735 is a constant-frequency PWM boost regulator IC that delivers a minimum of 2.1 A peak switch current. The regulator has a preset switching frequency of either 520 kHz or 1.6 MHz. This high frequency allows the 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 LM2735 is internally compensated, so it is simple to use, and requires few external components. The device uses current-mode control to regulate the output voltage. The following operating description of the LM2735 will refer to the simplified internal block diagram (Functional Block Diagram), the simplified schematic (Figure 13), and its associated waveforms (Figure 14). 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 corrective ramp of the regulator 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 . Figure 13. Simplified Schematic Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2735 LM2735-Q1 |
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Ähnliche Beschreibung - LM2735 |
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