L6920D

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The L6920D is a versatile voltage regulator integrated circuit (IC) designed for a wide range of applications in the switch mode power supply (SMPS) industry. It features an adjustable output voltage range of 1.8 - 20 V, few external components, an on-board error amplifier, and a high performance operational amplifier. The L6920D is suitable for use in DC/DC converters, battery powered systems, solar applications, and limited off-line power supplies.

The L6920D consists of a buck boost switching regulator with an adjustable output voltage range. It utilizes Pulse Width Modulation (PWM), a widely used modulation technique, to control the switched mode power converter. The output voltage can be adjusted by controlling the on-time of the switching cycles. The switching frequency is set by the internal oscillator and is typically around 100 KHz. The internal error amplifiers are used to provide the necessary feedback to regulate the output voltage.

The L6920D can be operated in two modes: Normal Mode and Disable Mode. In Normal Mode, the output voltage is regulated using the internal error amplifiers, and the voltage regulation loop is enabled. In Disable Mode, the output voltage is disconnected from the output and set to zero. The L6920D has three pins for control: RESET, PWMIN and ENABLE. The RESET pin is connected to the voltage control circuit, and it is configured to reset the internal oscillator when the input voltage falls below a certain threshold, such as 12V. The PWMIN pin is connected to an external Pulse-Width Modulation (PWM) signal, and it is used to control the output voltage. The ENABLE pin is used to turn the L6920D on or off.

The L6920D is especially suited for use in applications where a high level of flexibility and performance is required, such as in solar, battery powered, and limited off-line power supplies. Additionally, the L6920D has built-in short circuit and over-temperature protection, allowing it to operate safely in those applications. The L6920D also has a very low quiescent current, which makes it suitable for use in battery powered applications.

Overall, the L6920D is an excellent voltage regulator IC for a wide range of applications, especially for switch mode power supply applications. Its adjustable output voltage, few external components, on-board error amplifier, and high performance operational amplifier make it an ideal choice for those applications.

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