LT1074HVIT7#PBF

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Switch-mode DC-DC converters are power supplies used in a wide range of electronics and electrical applications. The LT1074HVIT7#PBF is a monolithic, high voltage, current mode, non-synchronous switch-mode DC-DC converter designed to deliver up to 8A or 750W of output power. It belongs to the PMIC (power management IC) voltage regulator family, specifically DC-DC switching regulators.

The LT1074HVIT7#PBF’s application fields range from industrial and communications equipment to consumer applications. Its main features include a high voltage loop compensation, a wide input source range from 4.5V to 80V, an adjustable output voltage range of 0.6V to 80V, and clock synchronization support. Additionally, it features cycle-by-cycle current limit overvoltage protection, soft-start and adjustable switching frequency from 1kHz to 500kHz.

The LT1074HVIT7#PBF implements a two-phase, current-mode, voltage-mode converter with an additional PWM controller serving as the main control loop for peak current mode. It provides current mode control, with an adjustable frequency operation up to 500kHz, providing flexibility in meeting the end-application needs. It also uses frequency-doubling, allowing an increase of current handling and reduced switching losses without the need of high speed components.

When in operation, it drives a pair of high side and low side power switches. The power switches convert the input voltage to the output voltage while also allowing current to flow through the inductor. During each cycle of operation, the converter adjusts the duty cycle of the power switches to converter the voltage at the input to the voltage at the output.

The operation of the converter is based on the energy stored in the output inductor during certain cycles and released back to the input during others. Thus, a voltage is present at the switch terminals, and the output is regulated by altering the duty cycle. It is a very efficient method of power conversion. Additionally, the frequency-doubling feature ensures a high efficiency by reducing the power lost in switching, interference and heat.

The integrated loop compensation network of the LT1074HVIT7#PBF ensures high stability over a wide range of loads and input voltages. This is done by using a voltage comparator, with external resistors and capacitors, to adjust the current level in the inductor and thus the output voltage.

The LT1074HVIT7#PBF offers many benefits in terms of its performance and safety, including cycle-by-cycle current limit overvoltage protection, selectable thermal shutdown protection and wide adjustable output voltage range. It is designed to offer a high-performance, simple and cost-effective solution for a wide range of DC-DC switch-mode power supply applications.

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