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TPS61222 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS61222 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 27 page I L t 200mA (typ.) ContinuousCurrentOperation DiscontinuousCurrentOperation 200mA (typ.) Current Sensor Gate Driver Device Control GND EN FB VOUT L VREF VIN Device Control StartUp VIN VOUT Current Sensor Gate Driver Device Control GND EN FB VOUT L VREF VIN Device Control StartUp VIN VOUT TPS61220, TPS61221, TPS61222 www.ti.com SLVS776B – JANUARY 2009 – REVISED NOVEMBER 2014 10 Detailed Description 10.1 Overview The TPS6122x is a high performance, high efficient family of switching boost converters. To achieve high efficiency, the power stage is realized as a synchronous-boost topology. For the power switching, two actively- controlled low-RDSon power MOSFETs are implemented. 10.2 Functional Block Diagrams Figure 23. Functional Block Diagram (Adjustable Figure 24. Functional Block Diagram (Fixed Output Version) Voltage Version) 10.3 Feature Description 10.3.1 Controller Circuit The device is controlled by a hysteretic current mode controller. This controller regulates the output voltage by keeping the inductor ripple current constant in the range of 200 mA and adjusting the offset of this inductor current depending on the output load. If the required average input current is lower than the average inductor current defined by this constant ripple current, the inductor current becomes discontinuous to keep the efficiency high under low-load conditions. Figure 25. Hysteretic Current Operation The output voltage VOUT is monitored via the 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. In fixed output voltage devices, an internal feedback network is used to program the output voltage. In adjustable versions an external resistor divider is required. The self-oscillating hysteretic current mode architecture is inherently stable and allows fast response to load variations. This architecture also allows using a wide range of inductor and capacitor values. Copyright © 2009–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS61220 TPS61221 TPS61222 |
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