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TPS61256CYFFR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS61256CYFFR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 29 page 10 TPS61256C SLVSDQ1 – FEBRUARY 2017 www.ti.com Product Folder Links: TPS61256C Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) Once the output capacitor has been biased to the input voltage, the converter starts switching. The soft-start system progressively increases the on-time as a function of the input-to-output voltage ratio. As soon as the output voltage is reached, the regulation loop takes control and full current operation is permitted. The TPS61256xC works in the pass-through mode when EN is low and Vin above UVLO, the device enters into the boost switching phase directly when EN becomes high. 9.3.4 Undervoltage Lockout The under voltage lockout circuit prevents the device from malfunctioning at low input voltages and the battery from excessive discharge. It disables the output stage of the converter once the falling VIN trips the under-voltage lockout threshold VUVLO which is typically 2.0V. The device starts operation once the rising VIN trips VUVLO threshold plus its hysteresis of 100 mV at typically 2.1 V. 9.3.5 Thermal Regulation The TPS61256xC device contains a thermal regulation loop that monitors the die temperature during the pre- charge phase. If the die temperature rises to high values of about 110 °C, the device automatically reduces the current to prevent the die temperature from increasing further. Once the die temperature drops about 10 °C below the threshold, the device will automatically increase the current to the target value. This function also reduces the current during a short-circuit condition. 9.3.6 Thermal Shutdown As soon as the junction temperature, TJ, exceeds 140°C (typ.) the device goes into thermal shutdown. In this mode, the high-side and low-side MOSFETs are turned-off. When the junction temperature falls below the thermal shutdown minus its hysteresis, the device continuous the operation. 9.4 Device Functional Modes 9.4.1 Power Save Mode The TPS61256xC 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 once the output voltage exceeds the set threshold voltage. The PFM mode is left and PWM mode entered in case the output current can not longer be supported in PFM mode. Figure 9. Power Save |
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