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TPS61085PWG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS61085PWG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 23 page DETAILED DESCRIPTION COMP FB GM Amplifier Vref SW GateDriverof Power Transistor IN SS PWM Generator Currentlimit and SoftStart ToffGenerator Ton PGND BiasVref = 1.24 V UVLO ThermalShutdown EN FREQ VIN VS TPS61085 SLVS859 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com Figure 11. Block Diagram The boost converter is designed for output voltages up to 18.5 V with a switch peak current limit of 2.0 A minimum. The device, which operates in a current mode scheme with quasi-constant frequency, is externally compensated for maximum flexibility and stability. The switching frequency is selectable between 650 kHz and 1.2 MHz and the minimum input voltage is 2.3 V. To control the inrush current at start-up a soft-start pin is available. During the on-time, the voltage across the inductor causes the current in it to rise. When the current reaches a threshold value set by the internal GM amplifier, the power transistor is turned off, the energy stored into the inductor is then released and the current flows through the Schottky diode towards the output of the boost converter. The off-time is fixed for a certain VIN and VS, and therefore maintains the same frequency when varying these parameters. However, for different output loads, the frequency may slightly change due to the voltage drop across the Rdson of the power transistor which will have an effect on the voltage across the inductor and thus on tON (tOFF remains fixed). Some slight frequency changes might also appear with a fixed output load due to the fact that the output voltage VS is not sensed directly but via the SW Pin, which affects accuracy. Because of the quasi-constant frequency behavior of the device, the TPS61085 eliminates the need for an internal oscillator and slope compensation, which provides better stability for the system over a wide of input and output voltages range, and more stable and accurate current limiting operation compared to boost converters operating with a conventional PWM scheme. The TPS61085 topology has also the benefits of providing very good load and line regulations, and excellent load transient response. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS61085 |
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