SC1104BISTRT

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The SC1104BISTRT is a DC-DC converter designed for offline flyback regulator applications with synchronous rectification. It is capable of delivering power up to 24W. The device integrates an overload protection circuit, low start-up current, stand-by power saving function, and a low duty ratio capability. The SC1104BISTRT is suitable for buck/boost topologies and other step-down configurations.

The main application field of the SC1104BISTRT is universal offline, low power isolation AC/DC and DC/DC conversion. The device is particularly suitable for PC motherboards and notebook adapters, providing high efficiency and cost-effectiveness, followed by low EMI and low no-load power. It also supports a wide AC input voltage range (with lower than 80Vrms input voltage) and supports an output voltage adjustable within 4.5V to 56V.

The working principle of the SC1104BISTRT is quite simple. The device is capable of regulating the output voltage from 4.5V to 56V by changing the duty ratio and frequency of the converter’s PWM control. It has two pins for controlling the duty ratio and frequency, D-SENSE and DRV. D-SENSE is used for voltage sensing, and DRV is used for regulating the duty ratio and frequency. When D-SENSE is higher than the rising voltage level and output voltage drop below a certain value, the output duty ratio decreases, resulting in higher output voltage. When DRV is lower than the falling voltage and output voltage is higher than a certain range, the output duty ratio increases, resulting in a lower output voltage.

The SC1104BISTRT is an ideal DC-DC converter for a variety of offline flyback applications. It is exceptionally user-friendly and makes it easy to fine-tune the performance in power supply design. Its integrated overload protection, low start-up current, stand-by power saving function, and low duty ratio capability enable the device to provide efficient, robust and reliable regulation performance without sacrificing performance.

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