VIPER26HN

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The VIPER26HN is a monolithic integrated pulse-width-modulated (PWM) circuits pioneered by STMicroelectronics. The VIPER26HN is a high-performance switching voltage regulator-regulator employing a full bridge PWM topology with the specially designed internal control circuitry. It is suitable for use as an off-line low-power PSU in applications such as switched-mode power supplies (SMPS) for charged capacitors, lighting circuits, adapters, and energy meters. It provides DC output voltages as high as 20 V and can deliver up to 1.5 A of peak current. This device belongs to the PMIC - AC DC Converters, Offline Switchers category of integrated circuits.

The VIPER26HN has an operating temperature range of -40°C to +85°C and is available in the molded PQFP package. It integrates a proprietary full bridge controller and a rugged vertical power MOSFET to provide an efficient and reliable solution for off-line power supplies. The PWM module contains sophisticated control circuitry including current limitation, soft-start, and overvoltage protection circuitry.

The primary function of the VIPER26HN is to regulate DC output voltages from a wide range of input voltage sources. It regulates a wide range of power supply requirements by providing extremely accurate voltage regulation. The input source can range from 5V to 50V and the output voltage can range from 6V to 20V. The onboard watchdog timer can be used to detect and prevent latch-up or overvoltage conditions, and the programmable current limit prevents overcurrent faults from damaging the power supply system. The onboard soft-start feature helps protect the device from high inrush currents during start-up.

The VIPER26HN utilizes a PWM- based control scheme in order to provide high-efficiency operation. PWM stands for Pulse-Width Modulation and is a technique used in voltage regulation in which the output voltage is regulated by changing the duty cycle of the pulses in the output waveform. The duty cycle is the ratio of the “on” time of the output waveform, compared with the “off” time. The VIPER26HN’s PWM control circuitry ensures very tight voltage regulation over a wide line, load, and temperature range.

The VIPER26HN has several built-in protection features which contribute to its high performance, robust operation and long life. Under-voltage lockout and over-temperature protection keep the device from operating at unsafe levels, while overtemperature protection shuts down the regulator after a predetermined temperature level is exceeded. Overvoltage protection prevents the output voltage from exceeding its nominal voltage rating. The device also contains short-circuit protection and can be enabled or disabled via external control pins.

The VIPER26HN is an advanced, high-performance PWM switching voltage regulator-regulator which provides excellent power regulation, high efficiency and long-term reliability. It is suitable for use in a wide range of applications, including switched-mode power supplies, lighting circuits, energy meters and adapters. Its sophisticated control circuitry ensures precise voltage regulation over a wide range of line, load, and temperature conditions.

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