VIPER06XS

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The VIPER06XS is a member of the VIPer series of off-line meshed led switching regulators (MSRs) developed by STMicroelectronics specifically for SMPS applications and LED driving systems. It is a multi-channel, self-biased and single-stage regulator IC which combines a high frequency current-mode PWM controller with a power stage of external power MOSFETs. It is the only MSR IC with up to five external MOSFETs and up to five current channels, making it suitable for applications requiring complex current configurations.

The VIPER06XS is designed to operate as both an AC/DC (ac-dc) converter or as an offline switcher. It has the capability to drive multiple LED strings or LED backlighting systems up to 750mA and to drive inductive loads up to 2A. The device supports a wide input voltage range from 14V to 13.5V which makes it extremely suitable for applications requiring low cost AC/DC or offline switcher designs when reducing component count is critical. The VIPER06XS is also capable of operating within the extended range of 7-28 V or up to 28V when using a Vcc auxiliary pin.

In an AC/DC converter, the VIPER06XS provides an efficient control of the power stage component by regulating the average current through an external PWM-controlled MOSFET. The power stage components, including the rectifier and the PFC switch, are externally connected to the device and are externally driven by the device. The rectifier is responsible for converting the AC power supply to DC while the PFC switch keeps the DC output voltage constant by controlling the current draw of the load. The VIPER06XS has integrated protection to ensure that the control loop is stable under sudden load changes and short-circuit conditions. As this device is also a current-mode PWM (CMPWM) controller, the output voltage can be set to any desired level. The output voltage ripple can be kept to a minimum by setting the period of the PWM waveform to the maximum value.

In an Offline Switcher application, the VIPER06XS directly drives the power MOSFETs. The IC provides a low-noise square wave signal that drives a set of power MOSFETs in order to achieve a desired output voltage. The MOSFETs act as switches and the VIPER06XS automatically modulates the switch duty cycle to ensure that the output voltage is regulated. The device can sink or source more than 2 A and is able to switch at frequencies above 1 MHz. It can also be used to generate gate drive signals for external switching circuits. Furthermore, the device includes comprehensive protection and monitoring features, including a voltage controlled current limit, an overload detector, and an overvoltage shutdown, making the VIPER06XS the right choice for reliable, low-cost SMPS designs.

In conclusion, the VIPER06XS is a versatile and cost-effective integrated circuit designed for AC/DC and offline switcher applications. Its combination of a high frequency current-mode PWM controller, external power MOSFETs and comprehensive protection makes it ideal for applications requiring a low-cost, high performance, single-stage regulator.

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