ISL78229ARZ-T7A

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The ISL78229ARZ-T7A is a high performance DC-DC Switching Controller. This device combines a high level of integration, low power consumption, small size and high efficiency. The ISL78229ARZ-T7A is capable of synchronous and a wide variety of non-synchronous, constant frequency switching topologies, making it ideal for many applications such as power supplies, servers, communications, point-of-use power conversion and industrial equipment.

The ISL78229ARZ-T7A is designed to provide high switching performance and simplified implementation. It provides an integrated solution for boosting, bucking and buck-boost converter applications. The controller provides protections such as over-voltage, under-voltage, over-temperature, over-current and external over-voltage (compliant with EN55022).

Features

• Synchronous and non-synchronous, constant frequency switching topologies
• Integrated gate driver, boost diode and external Bootstrap diode
• 80 dB, 2 kHz low frequency jitter, input/output ripple
• Low current consumption &=ndash; 1.5 μA in light load operation
• 14-lead SOIC and TSSOP packages
• Integrated level shifters
• ±10 and ±20 V output margins
• Over-temperature, over-voltage, under-voltage, over-current protections
• Maximum peak and average current limits
• Low shut down voltage

Working Principle of the ISL78229ARZ-T7A

The ISL78229ARZ-T7A uses a current-mode control loop, which is used to maintain the output voltage at a given level. The current-mode control is designed to ensure high power transfer efficiency and low noise levels. The device operates in constant frequency (CF) mode with adjustable frequency or in an externally synchronized mode.

The ISL78229ARZ-T7A includes an internal error amplifier which is used to compare the feedback voltage with a reference voltage and generate the error voltage. The error voltage then drives the pass element either in the active or the discrete sleep state. The pass element can be a power MOSFET or a BJT. The device also includes an enable signal and external/internal soft start for fast startup.

The on-chip gate driver of the ISL78229ARZ-T7A is a low voltage, low gate charge and low resistance driver with fast power up/down times. Its output is open drain and suitable to drive wide range of power MOSFETs and BJTs. It also features a output short protection.

Applications Of the ISL78229ARZ-T7A

• Notebook PC, desktop PC and server power supplies
• Low voltage DC-DC conversion solutions
• Power supplies for telecommunications
• Point-of-use power conversion
• Industrial equipment
• Automotive equipment
• White goods

The ISL78229ARZ-T7A is an ideal device for many applications with its high performance, power efficiency, small size, and low power consumption. Its innovative design makes it easy to use and its reliability is assured with integrated protection features. This makes it well suited for use in many types of systems and applications.

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