LTC1155IS8#PBF

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The LTC1155IS8#PBF is a monolithic low power, single-supply high-Speed MOSFET and IGBT gate driver IC. Developed by Linear Technology Corporation, it can be used in various power conversion applications such as in solar cell inverters, DC-DC or AC-DC converters, inverters and motor drives.

The LTC1155IS8#PBF is highly efficient because it supports low to high side gate-driven devices over an adjustable supply range from 3.2V – 16V. Furthermore, it integrates an internal boost regulator that allows the switching devices to be operated within their true load voltage range. The integrated adjustable precision current-limiting circuits also protect any MOSFET from entering a “latched-off” state due to an overtemperature or overcurrent condition.

This IC is available in a 8-lead PDIP, 8-lead VSSOP, and 16-lead TSSOP packages, and has several key features. It has a 1A peak source and sinking current capability on both its high and low-side drivers. The gate-driving voltage is adjustable from 4V to 16V, allowing it to drive high-voltage circuits reliably, and with minimal external components. Moreover, its soft start circuitry prevents inrush current, and its 1MHz guaranteed minimum switching speed helps to reduces switching transients. Finally, its wide adjustable deadtime of 11ns to 400ns makes it possible to optimize the performance of any given gate driver circuit.

The working principle of the LTC1155IS8#PBF is based on its DC-DC boost regulator. It has an internal switch that allows it to convert low voltage input signals into higher voltage output signals. The gate-driving voltage is controlled by the gate driver\'s internal gate-driving transistors, which are switched on and off according to the input signal applied to the gate driver. When the voltage applied to the gate driver exceeds its threshold voltage, the gate-driving transistors will switch from their off state to their on state, thereby driving the gate-driven device.

The adjustable precision current-limiting circuits incorporate a single adaptive window comparator circuit, which works in conjunction with the gate driver\'s internal current limiter. The circuit is designed to limit the amount of current flowing through the gate-driving transistors, thereby protecting them from any over-current condition. This prevents them from entering a "latched-off" state.

In addition, the LTC1155IS8#PBF integrates a soft start circuit, which helps to reduce inrush current from the switching devices, thereby helping the system to start more efficiently. This circuit includes an adjustable timing resistor, allowing the system designer to adjust the soft start time.

The LTC1155IS8#PBF is an ideal solution for various power conversion applications, such as in solar cell inverters, DC-DC or AC-DC converters, inverters and motor drives, due to its wide adjustable supply range, adjustable gate-driving voltage, adjustable precision current-limiting circuit, and its wide adjustable deadtime. It is also extremely efficient, which helps to reduce the overall power consumption of the system.

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