VIPER50-22-E

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Power management Integrated Circuit (PMIC) has become increasingly important in low power electronic products. PMIC contains AC/DC converters, offline switching, and linear voltage regulation modules. One such product is the VIPER50-22-E, it is a synchronous buck DC/DC PWM controller chip which offers high efficiency, low cost, and reliable performance.

The VIPER50-22-E is a high performance, low power switching regulator with synchronous rectification and low output ripple. This chip also features a wide operating voltage range and current sensing. It is designed for off-line applications and is suitable for isolated output voltages down to 0.6 V and up to 10 A max.

The applications of VIPER50-22-E include laptops, digital cameras, smart phones and other portables. Due to its low output ripple, the chip can be used in noise sensitive applications such as Telecom, Cables and industrial systems.

The working principle of VIPER50-22-E is to switch inductor current, which is then converted to a Direct Current output through the synchronous rectification. The regulating pulse width modulation (PWM) is used to control the output voltage and current.

The VIPER50-22-E is powered by the main system power supply, and it takes input voltage from either the main power supply or a separate input voltage. A high current power switch is connected at the output of the chip, this switch is then connected to an inductor, diode, and output capacitor for filtering. The power switch is periodically enabled and disabled based on the Control Signal Logic, then this signal is sent to the external device (e.g. system load).

When the power switch is on, the current in the inductor ramps up, and when the power switch is off, the inductor current is discharged through the diode. The circuit also includes a output voltage feedback which is compared to the reference voltage. The feedback loop controls the duty cycle and thus helps maintain a constant output voltage.

The VIPER50-22-E has a maximum power dissipation of 5.25 W, which provides significant power savings compared to other switching solutions. The chip utilizes spread spectrum frequency modulation which helps reduce EMI. Other features include internal soft start and externally adjustable switching frequency.

To summarize, the VIPER50-22-E is a high performance, low power switching regulator with synchronous rectification and low output ripple. It is designed for off-line applications and is suitable for isolated output voltages down to 0.6 V and up to 10 A max. The chip is used in a variety of low power applications such as laptops, digital cameras, smart phones and other portables because of its low output ripple. The working principle of VIPER50-22-E utilizes a regulating pulse width modulation (PWM) to control the output voltage and current, accompanied with a feedback loop.

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