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TPS40091PWR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS40091PWR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page TPS40090 TPS40091 SLUS578B – OCTOBER 2003 – REVISED MAY 2006 www.ti.com APPLICATION INFORMATION FUNCTIONAL DESCRIPTION The TPS4009x is a multiphase, synchronous, peak current mode, buck controller. The controller uses external gate drivers to operate N-channel power MOSFETs. The controller can be configured to operate in a two-, three-, or four-phase power supply. The controller accepts current feedback signals from either current sense resistors placed in series with the filter inductors or current proportional signals derived from the inductors' DCR. Other features include an LDO regulator with UVLO to provide single voltage operation, a differential input amplifier for precise output regulation, user programmable operation frequency for design flexibility, external synchronization capability, programmable pulse-by-pulse overcurrent protection, output overvoltage protection, and output undervoltage shutdown. DIFFERENTIAL AMPLIFIER The unity gain differential amplifier with high bandwidth allows improved regulation at a user-defined point and eases layout constraints. The output voltage is sensed between the VOUT and GNDS pins. The output voltage programming divider is connected to the output of the amplifier (DIFFO). The differential amplifier can be used only for output voltages lower then 3.3 V. If there is no need for a differential amplifier, or if the output voltage required is higher than 3.3-V, the differential amplifier can be disabled by connecting the GNDS pin to the BP5 pin. The voltage programming divider in this case should be connected directly to the output of the converter. CURRENT SENSING AND BALANCING The controller employs a peak current-mode control scheme, which naturally provides a certain degree of current balancing. With current mode, the level of current feedback should comply with certain guidelines depending on duty factor, known as slope compensation to avoid sub-harmonic instability. This requirement can prohibit achieving a higher degree of phase current balance. To avoid the controversy, a separate current loop that forces phase currents to match is added to the proprietary control scheme. This effectively provides high degree of current sharing independently of properties of controller's small signal response. High-bandwidth current amplifiers can accept as an input voltage either voltage drop across dedicated precise current-sense resistors, or inductor's DCR voltage derived by an R-C network, or thermally compensated voltage derived from the inductor's DCR. The wide range of current-sense settings eases the cost and complexity constraints and provides performance superior to those found in controllers using low-side MOSFET current sensing. 8 Submit Documentation Feedback Copyright © 2003–2006, Texas Instruments Incorporated Product Folder Link(s): TPS40090 TPS40091 |
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