LT1509ISW#PBF

Power Factor Correction (PFC) is an important technology used in power supply design to improve the efficiency, power quality, and power system performance. PFCs control the current that is drawn from the main AC source, and make sure it is in phase with the voltage.

The LT1509ISW#PBF is a DC/DC controller that integrates over-voltage and over-current protection for offline power factor correction (PFC) applications. The controller is designed to reduce system cost, size, and power losses. The device also offers a high degree of flexibility in configuring the power stage by providing selectable voltage modes, as well as frequency control.

The device\'s input voltage can range from 85VAC to 265VAC, making it suitable for worldwide applications. The switching frequency can be adjusted from 400 kHz to 1.2 MHz via an external resistor, allowing the user to optimize system cost and performance. An output voltage of up to 420V can be selected for maximum efficiency. The controller features Active Burst Mode (ABM) and Sequential Spreading Mode (SSM) for ultra-low no-load power consumption. The LT1509ISW#PBF also supports an output open-drain fault signal for protection and communication systems.

The LT1509ISW#PBF is intended to improve power system quality, reduce system cost, and save power. It is suitable for offline switching power supplies, including those used in AC/DC adapters, switchmode battery chargers, and other applications. The device enables users to maintain accurate regulation over a wide range of load and operating conditions.

The LT1509ISW#PBF combines a fixed frequency, high voltage current mode controller with an on-chip SO-8 package, which helps reduce component count, board space and system cost. The on-chip low start-up current and low operating current (<150µA) ensure very low noise and long system reliability. An adjustable deadtime helps minimize energy loss and audible noise. This device provides a wide range of features and performance for DC/DC power conversion systems.

In summary, the LT1509ISW#PBF is a high performance DC/DC controller designed for offline power factor correction applications. It offers selectable voltage modes, frequency control, active burst mode, sequence spreading mode, and other features. The device enables users to reduce system cost and save power by providing accurate regulation over a wide range of load and conditions. This device is suitable for use in AC/DC adapters, switchmode battery chargers, and other applications.