VIPER37LD Integrated Circuits (ICs)

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The VIPER37LD is a high-power device designed for AC/DC converter and offline switcher applications. It is a low losses and high efficiency synchronous buck converter. It is a high-efficiency, low-cost power supply design solution. Due to its high-efficiency and low-cost, it is widely used in industrial, medical and consumer applications.

The VIPER37LD is a non-isolated buck converter with a wide input voltage range and a wide output voltage range. It operates in the continuous conduction mode (CCM) and is capable of delivering up to 37A continuous current at a high conversion efficiency of up to 95%.

The VIPER37LD has a primary side current sensing feature to protect against output short-circuit conditions. It also has an on-board temperature sensor for monitoring the device temperature, and an Input Current Limit (ICL) for limiting the primary side current in order to prevent the device from overheating. The device is designed to integrate with various external components such as Schottky diode, gate driver, power transistor and coil.

The VIPER37LD can be operated in both fixed frequency and variable frequency modes. In the fixed frequency mode, the switching frequency is adjustable and can be set in the range of 60 kHz to 750 kHz with a 0.54 MHz step size. In the variable frequency mode, the device can be adjusted to a switching frequency in the range of 180 kHz to 600 kHz.

The VIPER37LD is an excellent solution for a wide range of AC/DC converters and offline switchers such as off-line flyback converters, Forward converters, DC/DC step-down converters, and low-power cost-effective AC/DC converters in consumer and industrial applications.

In addition to its wide range of AC/DC converter and offline switcher applications. The VIPER37LD features leading edge features such as DigiTask technology for meticulous control of the power switch, integrated output current monitor for improved system efficiency, programmable low quiescent current for improved standby efficiency, adjustable output voltage soft-start control. This device also offers fast transient response time and line under voltage lockout.

The VIPER37LD operates with a peak primary current up to 37A with a switch duty cycle up to 100%. Its typical efficiency is above 95%, with a maximum frequency set-point of 600 kHz. The switch node is monitored by an internal current sensing circuit which can be used to control the primary side current of the device, thus reducing losses and improving efficiencies further.

The VIPER37LD is specifically designed to meet the rigorous requirements of AC/DC converters and offline switchers. Its wide input and output voltage range, high switching frequency, fast transient response, programmable low quiescent current and integrated output current monitor enables the design of more efficient, space and cost saving solutions, particularly in battery driven applications.

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