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PMIC - Voltage Regulators - DC DC Switching Regulators

LT1374HVCR#TRPBF Application Field and Working Principle

The LT1374HVCR#TRPBF is a high voltage monolithic switching regulator from Linear Technologies. It incorporates an 800V DMOS power switch and is optimized for a wide variety of flyback converter designs. This device is suitable for use in high voltage redundant power supplies, outdoor LED lighting or dimming applications, and applications involving multiple output rails that require wide input voltage range.

Features of the LT1374HVCR#TRPBF

The LT1374HVCR#TRPBF is designed with a number of features including an adjustable 800V-rated power switch and a wide input voltage range of 4.5V to 80V. It has an adjustable switching frequency of 400kHz to 2.2MHz and can operate over a temperature range of -40°C to +125°C with proper derating. It is available in space-saving MSOP-8 and SOT-223-5 packages.

The device also offers excellent component utilization, reduced component piecing and board area, improved power density and reliability. Additionally, it provides constant frequency spread-spectrum modulation for improved EMI performance and foldback current limit protection against line brownouts. The device can run with an open-feedback loop, enabling it to eliminate trimming resisters for output voltage and foldback current limit.

Application of the LT1374HVCR#TRPBF

The LT1374HVCR#TRPBF can be used to construct a wide range of flyback converters ranging from high input voltage applications of up to 80V to low input voltage designs operating at only 4.5V. It is particularly useful in medical and industrial applications that require high voltage, high efficiency, and low noise power supplies. It also has wide application in drive circuits, offline lighting, street lighting, etc.

Working Principle of the LT1374HVCR#TRPBF

The LT1374HVCR#TRPBF is an integrated monolithic step-up switching regulator. It operates on an alternating current from the line voltage, with a voltage regulation loop controlling the switch to regulate the output voltage. At light loads, it will pulse-frequency modulate to reduce switching losses and keep the input power in tolerance. In the case of a short output, the device can regulate the current limit to prevent a catastrophic failure.

The LT1374HVCR#TRPBF utilizes pulse-width modulation to generate the output voltage. During the switching cycle, the voltage across the MOSFET switch will raise to the maximum voltage defined by the input voltage, current and duty ratio. Thus providing a regulated output. Additionally, it includes protective features such as output overvoltage, open loop protection, foldback current-limit protection, and thermal overload protection.

Conclusion

The Linear Technology LT1374HVCR#TRPBF is a high-voltage monolithic switching regulator for flyback converter designs that offers excellent component utilization, improved power density and reliability. It is designed with an adjustable 800V-rated power switch and a wide input voltage range of 4.5V to 80V. It finds wide application in medical and industrial applications due to its high voltage, high efficiency, and low noise features.

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