11/15/2023 0 Comments High voltage dc dc converter![]() The LT3724 has a start-up requirement of V IN ≥ 7.5V. This reduces the power dissipation in the IC and increases converter efficiency. Common practice uses the on board regulator during startup and then back drives the V CC pin above its 8V regulated voltage during operation. The on-board regulator can operate the IC continuously, provided the input voltage and/or FET gate charge currents are low enough to avoid excessive power dissipation in the part. This regulator generates the local supply that powers the IC (V CC), from the converter input supply, V IN. The LT3724’s internal 8V linear regulator eliminates the need for an external regulator or a slow-charge hysteretic start scheme. The driver uses a bootstrapped supply rail which allows it to drive either a high side MOSFET, as found in buck converters, or a low side MOSFET, as found in boost converters. The gate driver is capable of driving large, low R DS(ON), standard level, n-channel MOSFETS without the need for a gate drive buffer. The LT3724 also incorporates a programmable soft-start that controls the slew rate of the converter output voltage during startup to reduce supply inrush currents and output voltage overshoot. ![]() If the inductor current exceeds the maximum current sense threshold, pulse skipping occurs. Supply short circuit control is via an external sense resistor, through which the LT3724 continuously monitors inductor current. A precision shutdown pin threshold allows for easy supply under voltage lockout where quiescent currents are reduced to less than 10♚. In Burst Mode operation quiescent current is reduced to under 100♚, making the LT3724 ideal for use in applications with supply maintenance requirements or light load and no-load conditions. User selectable Burst Mode operation can maintain high efficiency over a wide load range. An internal high voltage bias regulator allows for simple startup and biasing, and it can be back driven by the output to increase supply efficiency and lower power dissipation in the IC. The LT3724 uses a 200kHz fixed-frequency current-mode architecture. It offers simple solutions to regulating system voltages at high efficiencies over a wide input voltage range (4V–60V) and wide load range. The LT3724 is a single-switch DC/DC controller that can be used in medium power step-down, step-up, inverting and SEPIC converter topologies. ![]() Versatile Controller Simplifies High Voltage DC/DC Converter Designs ![]()
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