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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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LM2734ZMKX Fiches technique(PDF) 7 Page - Texas Instruments |
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LM2734ZMKX Fiches technique(HTML) 7 Page - Texas Instruments |
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7 / 36 page  L R 1 R 2 D 1 D2 BOOST Output Control Logic Current Limit Thermal Shutdown Under Voltage Lockout Corrective Ramp Reset Pulse PWM Comparator Current-Sense Amplifier RSENSE + + Internal Regulator and Enable Circuit Oscillator Driver 0.3: Switch Internal Compensation SW EN FB GND Error Amplifier - + VREF 0.8V COUT ON OFF VBOOST IL VSW + - CBOOST VOUT CIN VIN VIN ISENSE + - + - 0.88V - + OVP Comparator Error Signal LM2734Z, LM2734Z-Q1 www.ti.com SNVS334F – JANUARY 2005 – REVISED JANUARY 2016 7 Detailed Description 7.1 Overview The LM2734Z is a constant frequency buck regulator that can deliver load current of 1 A. Device is optimized for high-efficiency operation and includes a number of features that make it suitable for demanding applications. High switching frequency allows for use of small external components enabling small solution size and saving board space. Device is designed to operate from wide input voltage range up to 20 V, making it ideal for wide range of applications (such as automotive, industrial, communications, and so forth). LM2734Z can be controlled through shutdown pin, consuming only 30 nA in standby mode, making it very appealing for applications that demand very low standby power consumption. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Theory of Operation The LM2734Z is a constant frequency PWM buck regulator IC that delivers a 1-A load current. The regulator has a preset switching frequency of 3 MHz. This high frequency allows the LM2734Z to operate with small surface mount capacitors and inductors, resulting in a DC–DC converter that requires a minimum amount of board space. The LM2734Z is internally compensated, so it is simple to use, and requires few external components. The LM2734Z uses current-mode control to regulate the output voltage. The following operating description of the LM2734Z refers to the Functional Block Diagram and to the waveforms in Figure 7. The LM2734Z 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 corrective ramp of the Copyright © 2005–2016, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2734Z LM2734Z-Q1 |
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