TPS40090 - 4 通道多相降压 DC/DC 转换器

TPS40090是TI德州仪器公司的一款控制器（外部开关）产品，TPS40090是4 通道多相降压 DC/DC 转换器，本站介绍了TPS40090的封装应用图解、特点和优点、功能等，并给出了与TPS40090相关的TI元器件型号供参考。

TPS40090 - 4 通道多相降压 DC/DC 转换器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The TPS4009x is a two-, three-, or four-phase programmable synchronous buck controller that is optimized for low-voltage, high-current applications powered by a 5-V to 15-V distributed supply. A multi-phase converter offers several advantages over a single power stage including lower current ripple on the input and output capacitors, faster transient response to load steps, improved power handling capabilities, and higher system efficiency.

Each phase can be operated at a switching frequency up to 1-MHz, resulting in an effective ripple frequency of up to 4-MHz at the input and the output in a four-phase application. A two-phase design operates 180 degrees out-of-phase, a three-phase design operates 120 degrees out-of-phase, and a four-phase design operates 90 degrees out-of-phase.

The number of phases is programmed by connecting the de-activated phase PWM output to the output of the internal 5-V LDO. In two-phase operation the even phase outputs should be de-activated.

The TPS4009x uses fixed frequency, peak current mode control with forced phase current balancing. When compared to voltage mode control, current mode results in a simplified feedback network and reduced input line sensitivity. Phase current is sensed by using either current sense resistors installed in series with output inductors or, for improved efficiency, by using the DCR (direct current resistance) of the filter inductors. The latter method involves generation of a current proportional signal with an R-C circuit.

The R-C values are selected by matching the time constants of the R-C circuit and the inductor; R-C = L/DCR. With either current sense method, the current signal is amplified and superimposed on the amplified voltage error signal to provide current mode PWM control.

An output voltage droop can be programmed to improve the transient window and reduce size of the output filter. Other features include a single voltage operation, a true differential sense amplifier, a programmable current limit, soft-start and a power good indicator.

产品特性

Two-, Three-, or Four-Phase Operation
5-V to 15-V Operating Range
Programmable Switching Frequency Up to 1-MHz/Phase
Current Mode Control With Forced Current Sharing(1)
1% Internal 0.7-V Reference
Resistive Divider Set Output Voltage
True Remote Sensing Differential Amplifier
Resistive or DCR Current Sensing
Current Sense Fault Protection
Programmable Load Line
Compatible with UCC37222 Predictive Gate Drive™ Technology Drivers
24-Pin Space-Saving TSSOP Package
28-Pin QFN Package
TPS40090: Binary Outputs
TPS40091: 3-State Outputs
APPLICATIONS
- Internet Servers
- Network Equipment
- Telecommunications Equipment
- DC Power Distributed Systems

(1) Patent pending. Predictive Gate Drive is a trademark of Texas Instruments.

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