PCA9901UK,027

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The PCA9901UK,027 is a LED driver with integrated pulse-width modulation (PWM) control logic designed to drive up to 4 high-brightness LEDs from a 9–30V AC/DC power source. It features a buck-type full bridge configuration consisting of two MOSFETs in a half-bridge configuration and four external level-shifting N-MOSFETs. This unit features low EMI, low current ripple, low switching losses and minimal heat generation, with built-in thermal protection.

Application Field

The PCA9901UK,027 application field mainly includes indoor and outdoor LED display signs, LED decorative luminaires, LED architectural lighting and architectural details, LED lamps and lanterns, landscape lighting projects, vehicle suspended displays, tunnel lighting applications, firefighting lighting applications and so on.

Working Principle

LEDs are current-driven devices, meaning that they need a constant current supply to ensure a consistent light output over their usable lifetime. The PCA9901UK,027 provides this by featuring a built-in voltage regulator and switching circuitry. The nominal load is set with the constant current regulator, which adjusts over a wide range of input voltages to keep an accurate output voltage in crossover, providing a constant output current with no external current limitation, for any voltage range.

The pulse-width modulation (PWM) control logic helps to provide a dynamic lighting scheme by adjusting the output frequency and duty cycle, which allows for different effects with a single LED. The dynamic range of the device is also adjustable, and there is no hard-wired upper limit on the LED current and dynamic range, meaning that any number of LEDs can be used with the device.

The PCA9901UK,027 has one integrated IC and 4 external power MOSFETs, and the half-bridge configuration provides easy implementation of low-side or constant current regulation. The switching frequency is adjustable and can be set to operate at 200kHz to 400kHz. The input voltage range is 9–30V, and the output current can be adjusted from 500mA to 1A. The device is designed for both DC and AC operation.

Conclusion

Overall, the PCA9901UK,027 is an excellent LED driver offering wide application, high brightness, and dynamic lighting effects. Its buck-type full bridge topology and wide input voltage range make it ideal for a wide range of LED applications. Its adjustable switching frequency and duty cycle provide excellent control and flexibility, while its low EMI, low current ripple, and low switching losses make it an efficient, integrated LED lighting solution.

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