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TPS61252 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61252 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page ( ) OUT IN DS(on) OUT V V DCR r I = - + g TPS61252 www.ti.com SLVSAG3A – SEPTEMBER 2010 – REVISED DECEMBER 2014 Feature Description (continued) 10.3.9 Thermal Regulation The TPS61252 contains a thermal regulation loop that monitors the die temperature. If the die temperature rises to values above 110 °C, the device automatically reduces the current limit to prevent the die temperature from further increasing. Once the die temperature drops about 10 °C below the threshold, the device automatically increases the current to the set value. This function also reduces the current during a short-circuit-condition. 10.3.10 Thermal Shutdown As soon as the junction temperature, TJ, exceeds 140°C (typical), the device enters thermal shutdown. In this mode, the High Side and Low Side MOSFETs are turned-off. When the junction temperature falls about 20 °C below the thermal shutdown, the device resumes operation. 10.4 Device Functional Modes 10.4.1 Power Save Mode The TPS61252 integrates a power save mode to improve efficiency at light load. In power save mode the converter only operates when the output voltage trips below a set threshold voltage. It ramps up the output voltage with several pulses and goes into power save mode again once the output voltage exceeds the set threshold voltage. During the power save operation when the output voltage is above the set threshold, the converter turns off some of the inner circuits to save energy. Figure 8. Power Save Mode The PFM mode is left and PWM mode entered, in case the output current can no longer be supported in PFM mode. 10.4.2 100% Duty-Cycle Mode If VIN > VOUT, the TPS61252 offers the lowest possible input-to-output voltage difference while still maintaining current limit operation with the use of the 100% duty-cycle mode. In this mode, the high-side switch is constantly turned on. During this operation, the output voltage follows the input voltage and will not fall below the programmed value if the input voltage decreases below VOUT. The output voltage drop during 100% mode depends on the load current and input voltage, and is calculated as: where • DCR is the DC resistance of the inductor • rDS(on) is the typical on-resistance of the high-side switch (4) If the load current exceeds the set current limit, the resistance of the high-side switch increases to limit the current and the output voltage drops. Copyright © 2010–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS61252 |
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