TPS61257EVM-711

Series:	--
Part Status:	Active
Main Purpose:	DC/DC, Step Up
Outputs and Type:	1, Non-Isolated
Voltage - Output:	5.5 V
Current - Output:	700mA
Voltage - Input:	2.3 V ~ 5.5 V
Regulator Topology:	Boost
Frequency - Switching:	3.5MHz
Board Type:	Fully Populated
Supplied Contents:	Board(s)
Utilized IC / Part:	TPS61257

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TPS61257EVM-711 is a pre-programmed evaluation module targeting the TPS61257DDC, a 7-V to 27-V, 1.5-A, integrated step-down converter with TPS61257DDC compatible supply voltage range from 4.4V to 27V. It features an integrated switched-mode high frequency converter operating from an input voltage range of 4.4V to 27V, which can provide an output voltage range from 0.5V to 7V. The separately adjustable buck current limits the maximum output current to 7A. Featuring a high-accuracy current-mode control system, the converter provides excellent transient response for both line and load change conditions and operates in either Discontinuous Conductor Mode (DCM) or Continuous Conductor Mode (CCM).The TPS61257EVM-711 is particularly well-suited for high-performance applications requiring low input/output differences and high efficiency. Fully compliant with international safety standards, the evaluation module supports a wide range of applications such as power supplies for battery chargers, computers, multi-media equipment, automotive systems, home appliances, and consumer electronics.Working PrincipleThe TPS61257EVM-711 is a high efficiency, integrated step-down converter with up to 27V input voltage range and 7A output current capability. Its built-in switching regulator converts the high input voltage into a low output voltage with very high efficiency. The TPS61257DDC uses a switching frequency of 450kHz, allowing for small inductor sizes and making the module suitable for compact designs.The module consists of three main parts: a controller, a driver, and an inductor. The driver consists of one power MOSFET and two control MOSFETs. The controller uses current-mode control to regulate the output voltage by adjusting the ratio of on-time to off-time of the power MOSFET. The duty cycle is maintained until the desired output voltage is reached. The output voltage is then sensed and feedback to the controller. If the output voltage deviates from the programmed value, the controller adjusts the duty cycle to restore the output voltage to its set point by either increasing or decreasing the duty cycle.The TPS61257EVM-711 also features a proprietary control scheme which combines a fast current-mode control loop with a slow voltage-mode loop for improved transient response, allowing stable operation over a wide output voltage range. In addition, the TPS61257EVM-711 provides built-in under-voltage and over-voltage protection. When the input voltage is under- or over-volt, it will be shut off.In conclusion, the TPS61257EVM-711 is an integrated step-down converter designed for applications requiring high efficiency and low input/output differences. It is ideal for battery chargers, computer applications, automotive electronics, as well as a variety of consumer products. Its built-in safety features provide protection against over-voltage and under-voltage conditions, while its highly efficient switching regulator allows for a wide range of applications.

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