VIPER37HDTR

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PMIC - AC DC Converters, Offline Switchers

VIPER37HDTR is a superior fully integrated high-performance offline quasi-resonant (QR) power switching regulator integrated circuit. It is a high-current, high-efficiency device suitable for a variety of AC/DC power supplies. It is specifically designed for a non-isolated QR Flyback converter in an off-line AC/DC power supply with an input voltage range of 85V-265V or wide range of 277V-528V. The device is built using On-Semi advanced VIPer technology, which combines very low losses with a very low start-up current. It incorporates an auto-restart feature to simplify device control and configuration. This integrated circuit also includes a wide range of standard features to ensure low standby power, reliability, and compatibility with a variety of other system components.

Application Field

VIPER37HDTR is used in a variety of AC/DC power supplies. It is specifically designed for a non-isolated QR Flyback converter in an off-line AC/DC power supply with an input voltage range of 85V-265V or wide range of 277V-528V. It can be used in low-power, high-power and high-efficiency applications, such as telecom, industrial, consumer products, and automotive. The device is also used in Charge Pumps in high-power (>400W) applications, with efficiency levels as high as 95%.

Working Principle

The devices employ a quasi-resonant (QR) topology to provide excellent efficiency, high power density, high power integrity, and low standby power. The QR topology utilizes a soft switching transition at the critical points during the operation of the primary switch, thus minimizing losses and resulting in higher efficiencies. This switch mode power supply operates on a fixed frequency, typically in the range of 67kHz to 167kHz, with an average output rating of up to 1MHz.

The device utilizes an auto restart technique that requires no external components. When the output voltage approaches the target regulation set-point, the internal current sensing circuit senses this and the output is shutdown to eliminate overshoot. The device uses a current limit setting which prevents the internal power switch from damaging the off-line power supply during overload conditions.

VIPER37HDTR also incorporates on-die thermal protection techniques, including temperature-based foldback and current limitation, which help preserve system and device reliability in high-temperature operating environments. These features can be enabled or disabled through the use of external components.

The device provides comprehensive fault protection and diagnosis capabilities, including over-current protection (OCP), short-circuit protection (SCP), open-loop detection, and over-voltage protection. It also includes a standby detection circuit to enable automatic start-up and shutdown of the power supply.

In summary, On-Semi VIPER37HDTR is a powerful integrated circuit for AC/DC power supply applications. It provides excellent performance, high power integrity, and low standby power, making it an ideal choice for high-efficiency and low-power AC/DC power supplies.

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