LM20154EVAL

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LM20154EVAL is a current mode offline, low-power SMPS controller with an integrated MOSFET and a complete System-on-Chip architecture. It is designed for DC-DC and AC-DC applications, where high-efficiency, low conduction loss, low-ripple, and high power density are required.

The key features of the LM20154EVAL evaluation board include a wide 4:1 input voltage range, an integrated MOSFET with low RDS(on) of less than 13mΩ, and an integrated regulator featuring current mode PWM control with a constant frequency operation. The device is also capable of supporting a single-ended primary inductor converter (SEPIC), as well as a Sync-Rectified Flyback topology.

The working principle of the LM20154EVAL is based on an open-loop, transistor level circuit having an input stage, a drive stage, and a logic-level control stage used for the driver switch and control signals. The system-on-chip architecture is used to optimize the power management of the SMPS controller. This architecture is composed of a digital core and an analog core. The digital core comprises a processor, an embedded oscillator, and digital logic gates. The analog core contains analog amplifiers, a comparator, and a digital-to-analog converter.

The SMPS controller is responsible for receiving an input voltage signal and converting it into a pulse-width-modulated (PWM) output signal. This signal is then used to open or close the power switch to control the output voltage. The controller can also operate as a current-mode PWM controller when the current-mode logic is enabled. This current-mode logic is used to reduce switching losses and to deliver a higher output voltage.

The LM20154EVAL evaluation board is used to evaluate the performance of the LM20154 SMPS controller in a wide range of DC-DC and AC-DC applications, such as powering an LED panel from a battery source, powering a 12V laptop computer, or powering a medical device from an AC supply. The board is also used to evaluate the performance of the controller in applications where high current or operating frequency conversion is required.

The evaluation board can be configured to operate in different modes, such as PFC, CCM, DCM, Emulated Valley Current Mode (EVCM), and Zero Auxiliary Component (ZACM) mode. This flexibility enables the user to evaluate several different converter topologies and to select the best possible mode for the application.

The LM20154EVAL evaluation board is used to measure and analyze the performance of the controller in various AC-DC, DC-DC, and LED applications. The measured parameters include efficiency, ripples, power factor, voltage or current regulation, response time, and transient response. The evaluation platform can also be used to evaluate the pulse-by-pulse current limit, dynamic line regulation, multi-droop compensation, and window comparator protection features that are integrated into the LM20154.

The evaluation board includes an I2C interface, which enables the user to access the device and program the parameters and settings directly from a personal computer. The board also includes a status and debugging LED along with a connector for a logic analyzer, which helps in accurate evaluation and debugging.

The LM20154EVAL evaluation board is used to test and analyze the performance of the LM20154 SMPS controller in numerous DC-DC and AC-DC applications, and it can also be used to evaluate the performance of the controller in a wide range of LED applications. This evaluation board is easy to use and the I2C interface enables the user to program the parameters of the controller directly from a personal computer.

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