MAX17681EVKITD#

The MAX17681EVKITD# is an evaluation board for on-board DC/DC and AC/DC (off-line) switch-mode power supply (SMPS) applications. The primary offer of the MAX17681EVKITD# is to demonstrate the features of the MAX17681 product, which integrates a full scale switch-mode SMPS controller IC with several features that make it ideal for on-board and off-line SMPS applications. In this article, we will discuss the application field and working principle of the MAX17681EVKITD#.

In terms of application field, the MAX17681EVKITD# is suitable for use in systems requiring one or two isolated outputs, like in isolated LED lighting, server room cooling, telecom and medical, as well as consumer applications.The MAX17681EVKITD# supports DC and AC input levels in the range of 12 to 250VAC, providing a wide operating input voltage range suitable for a wide range of applications. The MAX17681EVKITD# also features flyback topology and switch-mode control, making it ideal for low-cost, high-density boards. In addition, the MAX17681EVKITD# also offers protection features, such as undervoltage lockout, overvoltage protection, and enable pin for system power good indication.

In terms of working principle, the MAX17681EVKITD# that integrates full-scale SMPS controller IC is based on flyback single-ended primary inductor converter (SEPIC) topology. The MAX17681EVKITD# utilizes a low-cost external MOSFET, thus simplifying gate drive signal related circuitry. The integrated MAX17681 IC provides all primary functions, such as monitoring input signals and currents, controlling the output voltage, and providing fault flags to the system. Furthermore, the MAX17681 IC integrates a fast-transient response loop with an adaptive off-time control scheme. This adaptive off-time control scheme enables the MAX17681EVKITD# to effectively regulate output voltage with minimal ripple.

The MAX17681EVKITD# features a high-efficiency design using a two-level primary control loop. The first loop controls the average output voltage by regulating the duty cycle of the main power switch. The second level of the feedback loop, the adaptive off-time controller, regulates the peak output voltage and minimizes output voltage ripple. The fast-transient response loop reduces output voltage overshoot or undershoot on load transients without sacrificing efficiency.The MAX17681EVKITD# also allows for system level protection, which can be achieved via integrated protections such as overvoltage protection (OVP), undervoltage lockout (UVLO), overcurrent protection (OCP), and temperature protection (TP).

In conclusion, the MAX17681EVKITD# is an evaluation board for on-board DC/DC and AC/DC (off-line) switch-mode power supply (SMPS) applications capable of providing up to two isolated output levels. It is ideal for low-cost, high-density boards and features various features that make it well suited for a wide range of applications. This includes features such as undervoltage lockout, overvoltage protection, enable pin for system power good indication, and a high-efficiency design using a two-level primary control loop. These features make the MAX17681EVKITD# an ideal choice for DC/DC and AC/DC (off-line) switch-mode power supply applications.