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TPS62150ARGTT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62150ARGTT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 43 page control logic Soft start Thermal Shtdwn UVLO PG control power control error amplifier gate drive HS lim LS lim PVIN PVIN AVIN PG PGND PGND AGND comp comp + _ timer tON DCS - Control TM direct control & compensation comparator ramp SW SW SW EN * SS/TR DEF * FSW * VOS FB Copyright © 2016, Texas Instruments Incorporated 8 TPS62150, TPS62150A, TPS62151, TPS62152, TPS62153 SLVSAL5D – NOVEMBER 2011 – REVISED SEPTEMBER 2016 www.ti.com Product Folder Links: TPS62150 TPS62150A TPS62151 TPS62152 TPS62153 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS6215x synchronous switched-mode power converter is based on DCS-Control topology, an advanced regulation topology that combines the advantages of hysteretic, voltage-mode, and current-mode control, including an ac loop directly associated with the output voltage. This control loop takes information about output voltage changes and feeds that information directly to a fast comparator stage. It sets the switching frequency, which is constant for steady-state operating conditions, and provides immediate response to dynamic load changes. To get accurate dc load regulation, a voltage feedback loop is used. The internally compensated regulation network achieves fast and stable operation with small external components and low-ESR capacitors. The DCS-Control topology supports pulse-width modulation (PWM) mode for medium and heavy load conditions and a power-save mode at light loads. During PWM, it operates at its nominal switching frequency in continuous- conduction mode. This frequency is typically about 2.5 MHz or 1.25 MHz, with a controlled frequency variation depending on the input voltage. If the load current decreases, the converter enters power-save mode to sustain high efficiency down to very light loads. In power-save mode, the switching frequency decreases linearly with the load current. Because DCS-Control topology supports both operation modes within a single building block, the transition from PWM to power-save mode is seamless without effects on the output voltage. Fixed-output voltage versions provide the smallest solution size and lowest current consumption, requiring only three external components. An internal current limit supports nominal output currents of up to 1 A. The TPS6215x offers both excellent dc voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing interference with RF circuits. 8.2 Functional Block Diagrams * This pin is connected to a pull down resistor internally (see Feature Description section) Figure 5. TPS62150 (Adjustable Output Voltage) |
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