LTC3852EUDD#TRPBF

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The LTC3852EUDD#TRPBF is a monolithic IC DC/DC controller with transformer-based high-voltage power-switching capabilities. This device operates with an input voltage range of 4V to 18V and a wide range of output currents. Using a unique voltage-mode control scheme, the LTC3852EUDD#TRPBF is capable of controlling output voltages from 0.8V to VCC, depending on the transformer used. The output voltage setting can also be programmed using a feedback voltage. Using this flexible architecture, the device can operate as a Buck, Buck-Boost, Boost or SEPIC converter.

The LTC3852EUDD#TRPBF is designed primarily for non-isolated DC/DC applications such as distributed power supplies, but can be used in many other applications due to its wide operating range. It is especially suited to high-power, high-current applications where efficiency and low-noise performance are important factors. The device is also ideal for driving high-current LED and CFL bulbs. Additionally, the LTC3852EUDD#TRPBF can be used as a current-mode control device.

The LTC3852EUDD#TRPBF is capable of driving high-side MOSFETs with a gate voltage up to 7V and can act as a high-side current source, allowing for a wide range of operating points from continuous conduction mode (CCM) to discontinuous conduction mode (DCM). The device includes a programmable oscillator frequency and pulse-skip mode of operation, allowing the user to optimize the efficiency of the converter for different load levels. The LTC3852EUDD#TRPBF also features an integrated regulated LX driver with current sense trip point control. This feature enables the user to set a desired maximum input current level.

The LTC3852EUDD#TRPBF operates by sensing the output voltage of the regulator and then comparing it to the programmed reference voltage. When the output voltage exceeds the reference voltage, the device turns on the MOSFET and delivers a pulse of current to the transformer. As the current rises through the transformer, it induces a voltage to the output, which is sensed and compared with the desired output voltage. If the voltage difference is still greater than the reference voltage, another pulse of current is delivered to the transformer and the cycle repeats. This regulation cycle continues until the output voltage is the same as the reference voltage, at which point the device enters the pulse-skip mode. In the pulse-skip mode, the controller enters a low power sleep mode and turns on the MOSFETs only when the output voltages exceed the pre-programmed level.

In addition to its voltage-mode control, the LTC3852EUDD#TRPBF can also be configured as a current-mode controller. In this configuration, the device uses a current-sense signal from the MOSFETs to regulate the output voltage. When the current-sense signal exceeds a predetermined level, the device reduces the duty cycle until the output voltage is regulated to the desired level. This feature can be used to minimize switching losses and reduce the output voltage ripple.

The LTC3852EUDD#TRPBF is suitable for a variety of applications, including distributed power supplies, automotive electronics, switch-mode power supplies, high-voltage DC/DC converters, and lighting applications. In addition, it can be used to drive power FETs and boost converters with wide input voltages and high output current capabilities. The device includes a number of protection features, such as an over-temperature, over-current, and under-voltage lockout, ensuring safe and reliable operation.

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