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TPS61261DRVT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS61261DRVT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page + - V FB GND FB VOUT L VIN EN Current Sensor Gate Control Modulator Device Control VIN VOUT RI VOUT TPS61260, TPS61261 SLVSA99B – MAY 2011 – REVISED NOVEMBER 2014 www.ti.com Functional Block Diagrams (continued) Figure 16. TPS61261 8.3 Feature Description 8.3.1 Controller Circuit The controlling circuit of the device is based on a current mode topology. The inductor current is regulated by a fast current regulator loop which is controlled by either a voltage control loop or a reference current. The controller also uses input and output voltage feedforward. Changes of the input and output voltages are monitored and immediately change the duty cycle in the modulator to achieve a fast response to those errors. The voltage error amplifier gets its feedback input from the FB pin. For the adjustable output voltage version, a resistive voltage divider must be connected to that pin. For the fixed output voltage version, the FB pin must be connected to the output voltage to directly sense the voltage. Fixed output voltage versions use a trimmed internal resistive divider. The feedback voltage is compared with the internal reference voltage to generate a stable and accurate output voltage. The reference current for average output current control is programmed with a resistor connected between the RI pin and GND. The programming of the average output current also affects the maximum switch current in the main switch which basically is the input current. The lower the average output current is programmed, the lower the maximum input current. Now, maximum input power is controlled as well as the maximum peak current to achieve safe and stable operation under all possible conditions. Smaller inductors with lower saturation current ratings can be used, when lower average output currents are programmed. 8.3.2 Synchronous Boost Operation The device uses 3 internal N-channel MOSFETs to maintain synchronous power conversion at all possible operating conditions. This enables the device to keep high efficiency over a wide input voltage and output power range. Using 2 rectifying switches also enables the device to control the output voltage and current during startup conditions when the input voltage is higher than the output voltage. During startup, the rectifying switch works in a linear mode until the output voltage is near the input voltage. Once in regulation, operating with the input voltage greater than the output voltage may cause either the output voltage or current to exceed its regulation value. Although this operating point is not recommended, the device will not be damaged by this as long as absolute maximum ratings are not violated. 10 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: TPS61260 TPS61261 |
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