LT1242IS8#TRPBF

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LT1242IS8#TRPBF is a switched-mode power supply (SMPS) controller IC that is monolithically integrated by Linear Technology Corporation. With a fixed operating frequency of 33kHz and its self-protection features, this IC is suitable for offline applications. It is used in multiple AC/DC switching power supplies and flyback converters.

This device integrates an oscillator, a power MOSFET driver, undervoltage lockout protection, current-limit protection, overload protection, frequency-jittering network, and thermal overload protection. The output current range is from 0.7 A to 10A. The quiescent current is very low, i.e., around 8mA. This device works in either a continuous or discontinuous conduction mode. The built-in features make this IC desirable for cost-sensitive and robust power supply applications.

The application field of the LT1242IS8#TRPBF is mainly divided into two categories. First of all, its most common application is as a structural control IC in many switching power supply systems including AC/DC converters, DC/DC converters, and flyback converters. Secondly, it can also be used in other offline switching power supplies where the needs of stability, noise resistance, and precision must be met.

The working principle of the LT1242IS8#TRPBF is based on a linear feedback design. A voltage reference is used to create a feedback loop to adjust the output voltage. To control the output current, the current through the power MOSFET is monitored and compared to the reference voltage. The load and the output current are modulated by the power MOSFET driver according to the feedback signal. The thermal protection circuit is designed to protect the circuit from over temperature condition by shuttering off the power MOSFETs.

In short, the LT1242IS8#TRPBF IC is a cost-effective SMPS controller IC, which is suitable for most offline applications. It integrates a wide range of features including frequency jittering network, thermal overload protection, current-limit protection, and overload protection.

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