TPS40304EVM-353

Series:	--
Part Status:	Active
Main Purpose:	DC/DC, Step Down
Outputs and Type:	1, Non-Isolated
Voltage - Output:	1.2V
Current - Output:	20A
Voltage - Input:	8 V ~ 14 V
Regulator Topology:	Buck
Frequency - Switching:	600kHz
Board Type:	Fully Populated
Supplied Contents:	Board(s)
Utilized IC / Part:	TPS40304

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The TPS40304EVM-353 is an evaluation board for off-line switched-mode power supplies (SMPS) with DC/DC and AC/DC applications. This board works by providing evaluation of the TPS40304 3A DC/DC buck converter and demonstrating its many strengths, such as its very low external component count and its ability to support wide input voltage range. It also allows the user to further explore and innovate in the use of the TI TPS40304 specifically for DC/DC and AC/DC applications.The TPS40304EVM-353 board is equipped with a special adjustable input voltage range, from as low as 6V up to 40V, as well as an adjustable high frequency switching frequency that allows the user to optimize the gate drive voltage for accurate timing. This includes the ability to adjust the output voltage and current. In addition to this, the board also offers a wide range of sensing and protection possibilities, giving the user the ability to take full advantage of the device’s many features.The board itself consists of mainly two sections: the first includes the voltage controller, the switching MOSFETs, the sense resistors, and the protection circuitry. The second section is the control circuitry, which contains the reference components and current sense circuitry, and a few other minor components. The board is also equipped with an external input power stage and an input voltage regulator.The operation of the TPS40304EVM-353 is achieved through a three-stage control loop. In Stage 1, the TL431 voltagereference IC provides the voltage feedback signal to the TPS40304 error amplifier. In Stage 2, the output voltage is adjusted by varying the duty ratio of the MOSFETs (switches) through the use of the control pins. In the final stage, current sensing is achieved through the sensing circuitry which is connected to the output of the MOSFETs. When a current limit is reached, the output of the error amplifier is pulled high, causing the MOSFETs to turn off and thus protecting the device from over-current conditions.In applications where the optimum current and power are needed, the user can set the current limit by changing the resistance of the current sensing resistors. With the adjustable frequency and slew rate of the TPS40304, the board can be used to drive highly efficient power supplies that can be used in a variety of applications, ranging from AC/DC converters to DC/DC converters, and even for motor control and DC-AC inverter applications.Overall the TPS40304EVM-353 is a great platform for user innovation and development for DC/DC and AC/DC applications. By taking advantage of the low external component count and input voltage range as well as by using the adjustable frequency and slew rate of the device, users are able to get the most out of the device in order to meet their specific needs. With its various protection and sensing capabilities, the device can provide reliable performance even in the most demanding situations.

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