LT1243IS8#PBF

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The LT1243IS8#PBF is a monolithic high-voltage advanced primary-side synchronous switching controller, which can be used in voltage applications. It features SmartMOS technology, which provides a high degree of integration, low cost and small size solutions. With its advanced primary-side control architecture, this device simplifies the design and reduces the external components greatly to optimize power efficiency and cost.

The LT1243IS8#PBF features integrated buck/boost control, over-voltage and self-start protection, soft-start current limit, and programmable output current limit. It also can be used in simple Boost-Buck-Boost topologies. These features make it very suitable for non-isolated offline converters.

Its working principle is as follows. The LT1243IS8#PBF acts as the controller for a non-isolated buck/boost topology, setting the correct duty ratio and current limiting value from a primary side feedback or power-up setting. The PWM signal is generated by the chip, and then used as the gate drive signal to control the external power switch MOSFET. It also features soft-start current limit control, in which the current limit of the device is decreased gradually over the first few seconds of operation to reduce start-up surge current, and to minimize the output voltage undershoot.

The LT1243IS8#PBF eliminates the need of a bulky opto-isolation component and complicated secondary-side control circuits. With its simple and cost-effective design, this device is ideal for indoor, commercial and industrial offline power applications such as lighting, computers, consumer electronics and more.

In conclusion, the LT1243IS8#PBF is a high-voltage advanced primary-side synchronous switching controller which is widely used in PMIC - Voltage Regulators - DC DC Switching Controllers. With its excellent features, it will help to reduce the external components, simplify the design and optimize power efficiency and cost.

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