IR21381QPBF

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The IR21381QPBF is an integrated gate-driver for I2L-LED products. It is an Integrated Power Management IC (PMIC) offering an advanced and efficient solution for driving large LED arrays. The IR21381QPBF is designed to drive up to four LED strings with a constant or PWM controlled current source.

The device is primarily used in advanced Power over Ethernet (PoE) switching applications as well as in high power LED lighting control systems. It is capable of providing highly accurate linear dimming performance with refresh rates up to 60kHz. Further, it includes two photodiode inputs allowing its operation with a wide range of LED configurations.

The IR21381QPBF offers robust design on a single-chip gate-driver solution with several built-in protection and diagnostic features. Its design also includes a number of protection and diagnostic features such as over-current protection, overheating protection, an over-voltage shutdown (OVSD) circuit, and an integrated house-keeping loop (HKL) to reduce external component count.

The IR21381QPBF integrates a DC-DC converter, a high-side and low-side gate-driver, and a power-management logic. The device operates from a 5.5V supply, but delivers a maximum gate-drive of 98V peak across the LED string. It is also capable of delivering a continuous 7.2A of current to each LED string, and also features an adjustable voltage drop across the LED strings to ensure accurate and consistent LED current.

The IR21381QPBF features various features for system monitoring. These features include a power-on reset (POR) output to reset the system and a watchdog timer monitoring feature to detect potential software malfunctions and failure. Further, the device includes two photodiode inputs allowing its operation with a wide range of LED configurations. These inputs offer an adjustable filtering that helps suppress external disturbances.

The IR21381QPBF device achieves dynamic current control and dimming control with its PWM mode of operation. The device has two pulse-and-current modulation (PCM) inputs, allowing adjustable LED brightness over a wide range. It also includes an internal 6-bit LEDbrightness control register, enabling simple and accurate LED brightness adjustment via a single I2C command. The device also supports dimming options including static dimming or dynamic dimming via PWM.

The device operates within a wide range of temperatures, from -40°C to 85°C, and has an EMI optimized PCB design, allowing for higher efficiency and better EMI performance.

The IR21381QPBF represents a cost-effective and highly efficient gate-driver solution for high power LED control applications. Its single-chip design and comprehensive features provide a superior lighting control solution that includes high level of accuracy and precision.

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