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TPS61256A Datasheet(PDF) 12 Page - Texas Instruments |
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TPS61256A Datasheet(HTML) 12 Page - Texas Instruments |
12 / 32 page 12 TPS61256A SLVSB07A – JULY 2011 – REVISED MARCH 2018 www.ti.com Product Folder Links: TPS61256A Submit Documentation Feedback Copyright © 2011–2018, Texas Instruments Incorporated Feature Description (continued) 8.7.4 Load Disconnect And Reverse Current Protection Regular boost converters do not disconnect the load from the input supply and therefore a connected battery will be discharge during shutdown. The advantage of TPS61256A is that this converter is disconnecting the output from the input of the power supply when it is disabled (so called true shutdown mode). In case of a connected battery it prevents it from being discharge during shutdown of the converter. 8.8 Device Functional Modes 8.8.1 Load Disconnect And Reverse Current Protection Regular boost converters do not disconnect the load from the input supply and therefore a connected battery will be discharge during shutdown. The advantage of TPS61256A is that this converter is disconnecting the output from the input of the power supply when it is disabled (so called true shutdown mode). In case of a connected battery it prevents it from being discharge during shutdown of the converter. 8.8.2 Softstart The TPS61256A device has an internal softstart circuit that limits the inrush current during start-up. The first step in the start-up cycle is the pre-charge phase. During pre-charge, the rectifying switch is turned on until the output capacitor is charged to a value close to the input voltage. The rectifying switch is current limited (approx. 200mA) during this phase. This mechanism is used to limit the output current under short-circuit condition. 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. 8.8.3 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 typ. 2.1V. 8.8.4 Thermal Regulation The TPS61256A 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. 8.8.5 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. |
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