IR1161LTRPBF

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PMIC stands for Power Management Integrated Circuit. It is a device used in a wide range of electronic equipment and systems to control, monitor and regulate the power supply of the device or system. In this article, we will discuss an example of a PMIC, namely the IR1161LTRPBF, its application field and its working principle.

The IR1161LTRPBF is a compact, three-phase, current-mode, peak current-mode PWM controller IC. It features a tiny PbF-packaged SOT-23-6 package, making it ideal for use in space-constrained applications, such as notebooks and LCD displays. It has a wide operating temperature range of -40°C to +85°C. In addition, it offers undervoltage lockout (UVLO) protection, overvoltage protection (OVP) and overcurrent protection (OCP) for enhanced system robustness.

The IR1161LTRPBF is designed for synchronous boost converter and offline flyback converter applications. These include powering applications such as notebooks, LCD display and set-top boxes. It features adjustable peak current-mode control and programmable soft-start. In addition, a built-in phase shift oscillator is also included, allowing for reduced external component count.

The IR1161LTRPBF is designed for current-mode control, and hence it applies cycled current to the transformer to provide regulation of the output voltage. It monitors the current through the power transistor and makes adjustments if the current is too high or too low. It also adjusts the output pulse width accordingly to regulate the output voltage of the circuit. Furthermore, the device has an open loop start-up circuitry, providing the converter with a soft-start feature.

The IR1161LTRPBF is specifically designed to handle load and line transients, with input voltage range from 9V to 36V. It works in such a way that, when the current-sense control loop is closed, the peak current-mode controller regulates the output voltage by varying the pulse width of the output switching waveform. It can also detect an overcurrent condition, turning off the output switch when an overcurrent situation occurs.

The IR1161LTRPBF is an ideal choice for a wide range of synchronous boost converter and offline flyback converter applications. It provides a great combination of features that make it suitable for space-constrained environment such as notebooks and LCD displays. The device is highly adaptive to environmental changes and can handle both line and load transients. Furthermore, it includes a wide range of safety features, such as UVLO, OVP and OCP, making it even more robust in system applications.

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