VIPER013LSTR Integrated Circuits (ICs)

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The VIPER013LSTR is a type of PMIC, specifically an AC/DC converter, offline switcher. It is a monolithic MOSFET operating up to 350V, with a 500 kHz PWM frequency switch. It is a synchronous flyback based on VIPER13LSTR, a cost-optimized 800V/650V half-bridge MOSFETs.

The VIPER013LSTR features true hard switching operation, employable in any kind of topology. Offline switchers are used primarily in situations with poor or unreliable AC line control, such as solar power systems, medical, home appliances, lighting and automotive applications.

First, the AC line is rectified and filtered to get an unregulated DC voltage. This is then compared to a reference voltage and chopped using a power MOSFET switch. Finally, the chopped waveform is fed to an output filter to obtain a smooth DC output voltage.

The VIPER013LSTR uses a rugged N-type MOSFET for maximum efficiency, low switching losses and a high voltage rating. It utilizes a Miller method for turn-off snubber so that a high transition speed can be achieved when switching off the MOSFET. This allows for high power density and reliable operation even under harsh conditions.

The VIPER013LSTR also features an integrated temperature protection as well as diode emulation low drop-out (DE-LDO) control. DE-LDO helps in reducing the total power dissipation and achieve power savings. It also offers a flexible output voltage range so that devices can be used in applications with various input and output voltage requirements.

In addition, the VIPER013LSTR features an adjustable dead time. This can be used to minimize the switching losses and improve the dynamic response time for soft switching. Its integrated frequency jittering feature provides noise immunity of the high frequency signal from the PWM oscillator by varying the switching period.

Overall, the VIPER013LSTR is a powerful, cost-effective solution for applications requiring an AC/DC offline switcher. It provides high performance and easy integration while enabling reliable operation at high temperatures and frequencies. The DE-LDO control ensures greater power savings and low distortion, while the adjustable dead time helps to optimize the switching losses.

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