LM3495EVAL/NOPB

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The LM3495EVAL/NOPB evaluation board is an efficient, DC/DC & AC/DC (Off-Line) SMPS solution for evaluating the capabilities of the LM3495 power factor correction and current-mode boost controller. The LM3495EVAL/NOPB is comprised of a full-bridge diode rectifier circuit connected to an LLC resonant converter and an SMPS power stage. This evaluation board is designed to evaluate the features of the LM3495 boost regulator NFC controller with an ac-input transformer, two capacitors, and power resistors.

The LM3495EVAL/NOPB board has been designed to demonstrate the combined capabilities of the LM3495 boost regulator NFC controller and the LLC resonant converter. The LM3495 combines a power factor correction (PFC) motion feedback guidance circuit and an active-clamp boost PFC controller in a single device, providing high efficiency power factor correction with low harmonic distortion. The chip features an innovative cascoded active clamp with advanced boost PFC operation that provides a fast transient response, providing precise output voltage stabilization. The laterally diffused MOSFETs (LDMOS) on the board are rated for up to 40V operation, delivering power load capacitive ratings up to 400μF.

The LM3495EVAL/NOPB application is designed to demonstrate the low Start-up current Boost PFC operating mode of the LM3495. The power stage is based around two matched LDMOS, configured as a half bridge with a Schottky diode return swing. The EMI filter provides both input EMI and output EMI filtering, which is imperative for meeting the current EN55022 and EN55024 requirements. The board includes all the necessary components to build a complete quad 4-pin supply, with power factors greater than 0.9, and achieved line-regulation (∆V)values below 1%.

The main features of the LM3495EVAL/NOPB application field and working principle include:

• High efficiency boost PFC.
• Low standby power consumption (0.25W).
• High input voltage range from 80VAC to 270VAC, with a scaling range of 160VAC to 270VAC.
• Low start-up current with <1A.
• Output voltage ranging from 12V to 24V.
• Output current of 8A.
• High power enable control to reduce input standby power consumption.
• High ripple rejection.
• Minimum EMI requirements.
• Integrated power monitor.

In terms of practical evaluation and testing applications, the LM3495EVAL/NOPB can be used to evaluate the LM3495 controller under a number of different input voltages, loading conditions and output voltages. This board can also be used to evaluate the quality of the current waveform as well as the PFC performance and output voltage ripple on the input line. In addition, the evaluation board also enables detailed testing of the current and frequency response of the SMPS utilizing the integrated power monitor.

In summary, the LM3495EVAL/NOPB represents an efficient and cost-effective DC/DC and AC/DC (off-line) SMPS solution for evaluating the LM3495 boost regulator NFC controller. The board includes all the necessary components to build and demonstrate the combined features of the LM3495, providing high efficiency power factor correction, an input voltage range of 80VAC to 270VAC, and output voltages up to 24V. The board further features high ripple rejection, integrated power monitor, and EMI filter for meeting norm regulations and requirements, making the LM3495EVAL/NOPB an ideal evaluation board solution for testing and evaluating the LM3495 controller.

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