LTC3854IDDB

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The LTC3854IDDB is a high performance pin-selectable Device Mode step-down DC/DC controller for isolated applications. It integrates two N-channel MOSFET and one P-channel MOSFET with a wide input voltage range of 4V to 36V and an output current of up to 5A (depending on output voltage). The device is optimized for driving an isolated flyback or forward switch mode power supply (SMPS) at frequencies of up to 500kHz.

Application field:

The LTC3854IDDB is suitable for a wide range of isolated applications, including industrial and automotive applications. It is particularly suitable for driving an isolatedflyback SMPS in an intermediate bus voltage or forward topology. Typical applications include telecom/datacom, motor control and power supplies for AC/DC, DC/DC and DC/AC applications.

Working principle:

The LTC3854IDDB is a synchronous step-down controller designed to drive two n-channel MOSFETs and one P-channelMOSFET in a voltage mode switching regulator circuit. It allows stabilized output power with a high efficiency system. The device utilizes a fixed switching frequency of 400kHz and includes a unique programmable constant development (eCD) mode, which allows for output voltage to be adjusted from 0.8V to VIN. The LTC3854IDDB also offers a wide dynamic operational range. The device features soft-start, current limiting protection, and hiccup mode protection. In addition, the device has an adjustable soft-stop feature that ensures a slow and controlled shutdown of the system.

Functional features:

The LTC3854IDDB offers several advantages, including:

• Wide 4V to 36V input voltage range
• Programmable constant development (eCD) mode
• Integrated low gate charge N-channel and P-channel MOSFETs
• Output current up to 5A (depending on output voltage)
• Current limit protection
• Hiccup mode protection
• Soft start and adjustable soft-stop feature

Conclusion:

The LTC3854IDDB is a highly efficient and advanced DC/DC controller for isolated applications. It is designed for use in intermediate bus voltage and forward converters, providing high efficiency and excellent line and load regulation. The device offers a wide input voltage range, up to 5A output current, and advanced features such as eCD mode, current limit protection, hiccup mode protection, and adjustable soft-stop feature. With its high performance and enhanced features, the LTC3854IDDB is a versatile and reliable solution for isolator application.

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