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LM2735 Datenblatt(PDF) 11 Page - Texas Instruments |
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LM2735 Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 59 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, LM2735-Q1 www.ti.com SNVS485G – JUNE 2007 – REVISED AUGUST 2015 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Current Limit The LM2735 uses cycle-by-cycle current limiting to protect the internal NMOS switch. It is important to note that this current limit will not protect the output from excessive current during an output short circuit. The input supply is connected to the output by the series connection of an inductor and a diode. If a short circuit is placed on the output, excessive current can damage both the inductor and diode. 7.3.2 Thermal Shutdown Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 160°C. After thermal shutdown occurs, the output switch does not turn on until the junction temperature drops to approximately 150°C. 7.3.3 Soft Start This function forces VOUT to increase at a controlled rate during start-up. During soft start, the error amplifier’s reference voltage ramps to its nominal value of 1.255 V in approximately 4 ms. This forces the regulator output to ramp up in a more linear and controlled fashion, which helps reduce inrush current. 7.3.4 Compensation The LM2735 uses constant-frequency peak current mode control. This mode of control allows for a simple external compensation scheme that can be optimized for each application. A complicated mathematical analysis can be completed to fully explain the internal and external compensation of the LM2735, but for simplicity, a graphical approach with simple equations will be used. Below is a Gain and Phase plot of a LM2735 that produces a 12-V output from a 5-V input voltage. The Bode plot shows the total loop Gain and Phase without external compensation. Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2735 LM2735-Q1 |
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