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TPS610997YFFR Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS610997YFFR Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 23 page Continuous Current Operation at Heavy Load Burst Mode Operation at Light Load Output Voltage of Boost Converter t VOUT_NOM VOUT_BST Continuous Current Operation 300 mA (typ.) 300 mA (typ.) Discontinuous Current Operation IL t 9 TPS61099, TPS610994, TPS610997 www.ti.com SLVSD88C – JULY 2016 – REVISED JANUARY 2017 Product Folder Links: TPS61099 TPS610994 TPS610997 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated Feature Description (continued) boost converter enters into Burst mode. In Burst mode, the boost converter ramps up the output voltage with several switching cycles. Once the output voltage exceeds a setting threshold, the device stops switching and goes into a sleep status. In sleep status, the device consumes less quiescent current. It resumes switching when the output voltage is below the setting threshold. It exits the Burst mode when the output current can no longer be supported in this mode. Refer to Figure 15 for Burst mode operation details. To achieve high efficiency, the power stage is realized as a synchronous boost topology. The output voltage VOUT is monitored via an external or internal feedback network which is connected to the voltage error amplifier. To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the internal voltage reference and adjusts the required offset of the inductor current accordingly. Figure 14. Hysteretic Current Operation Figure 15. Burst Mode Operation 8.3.2 Under-Voltage Lockout An under-voltage lockout (UVLO) circuit stops the operation of the converter when the input voltage drops below the typical UVLO threshold of 0.4 V. A hysteresis of 200 mV is added so that the device cannot be enabled again until the input voltage goes up to 0.6 V. This function is implemented in order to prevent malfunctioning of the device when the input voltage is between 0.4 V and 0.6 V. 8.3.3 Enable and Disable When the input voltage is above UVLO rising threshold and the EN pin is pulled to high voltage, the TPS61099x is enabled. When the EN pin is pulled to low voltage, the TPS61099x goes into shutdown mode. In shutdown mode, the device stops switching and the rectifying PMOS fully turns off, providing the completed disconnection between input and output. Less than 0.5-µA input current is consumed in shutdown mode. |
Numéro de pièce similaire - TPS610997YFFR |
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