VIPER37LDTR Integrated Circuits (ICs)

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The VIPER37LDTR is a voltage mode SMPS PWM controller that integrates a 700 V VIPerstart and a 32-bit core ARM Cortex-M3 microcontroller into a single package. The device is intended for use in high efficiency, low-noise synchronous buck AC-DC converters for applications with operating voltages up to 600 volts and power levels up to 400W. The VIPER37LDTR is suitable for both offline and online applications.

The VIPER37LDTR is designed to offer superior performance, noise immunity, reliability and safety for SMPS applications for both high voltage and high power. It features an integrated 32-bit ARM Cortex-M3 microcontroller, a 700 V VIPerstart Fault Protection that provides quick and reliable overcurrent protection, and advanced EMI filters. The VIPER37LDTR also offers a variety of integration options, including high speed GaNK, adaptive dead-time control, synchronous rectification, a cycle-by-cycle current limit, and high-speed pulse-by-pulse current sensing.

The VIPER37LDTR is a voltage mode switching power supply (SMPS) controller, which is employed in a wide range of AC-DC applications. It is typically used to achieve increased efficiency and maximum power density in all types of AC-DC power conversion designs. The device offers a high voltage rating of up to 600 V, a pulse-by-pulse current limit, adaptive dead-time control, high-speed GaNK, a 700 V VIPerstart fault protection, and a 32-bit ARM cortex-M3 core.

The working principle of VIPER37LDTR follows a basic SMPS topology. The device can be used in both offline and online PMIC (Power Management IC) applications. The VIPER37LDTR operates by generating a switching voltage. This voltage is then used to drive a power switching transistor in a synchronous buck (step-down) converter. As the load currents vary, the VIPER37LDTR adjusts the duty ratio of the switching voltage to ensure that the output voltage remains constant. In synchronous buck converters, the VIPER37LDTR also allows for predictive current termination to ensure overcurrent protection for the power switch. In addition, the VIPER37LDTR features advanced EMI filters, which provide better noise immunity and improved reliability.

The VIPER37LDTR is an ideal solution for high efficiency, low noise and high power density AC-DC converter designs, such as offline and online converters. It offers a high voltage rating and a dedicated ARM Cortex-M3 core to provide a variety of protection and control functions. The device also allows for a wide range of integration options to provide higher efficiency, noise immunity and greater reliability, while helping to reduce component count and improve system-level design.

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