LM3530UMX-40/NOPB

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The LM3530UMX-40/NOPB is an adaptive compound LED driver manufactured by Texas Instruments. It is a PMIC (Power Management Integrated Circuit) designed to drive LED backlights. This device integrates a current regulator, dimming control, and switching power stage into one single solution which creates an extremely low power dissipation when compared to traditional backlight solution. The LM3530UMX-40/NOPB is capable of driving up to 40 white LEDs in series with a regulated current of up to 300mA. In addition to the regulated current capabilities, it also offers high frequency (> 1MHz) constant frequency dimming control and step-dimming capabilities.

Application Field

The LM3530UMX-40/NOPB is a highly versatile device and can be applied to many different applications. Common applications for the LM3530UMX-40/NOPB include LCD monitors, laptop and tablet displays, digital cameras, and industrial and automotive lighting. Its integrated current regulator, dimming control, and power stage make it an excellent choice for applications where low power consumption and long life of the backlight LEDs are important.

Working Principle

The LM3530UMX-40/NOPB is designed to operate as an adaptive, constant current step-dimmer LED driver. The device works by providing a constant current to the LEDs based on the control signal from the microcontroller. The current is regulated to within 5% accuracy even as the input voltage or temperature changes. This ensures that the LEDs are always kept at a consistent brightness throughout the entire operation. The dimming control signal is generated by an internal PWM generator, making it ideal for dimming the LEDs down to 0%. The device also offers a burst mode for applications where minimal current is required for short period of time.

The LM3530UMX-40/NOPB also incorporates an Undervoltage Lockout (UVLO) feature which prevents undervoltage conditions from damaging the device. As power is applied to the circuit, an internal comparator monitors the input voltage and disables the driver until it reaches the minimum threshold (3.3V). Once the voltage is sufficiently high, the driver is re-enabled and the LEDs start to light up.

The LM3530UMX-40/NOPB is an excellent LED driver choice for any application where energy efficiency, light intensity, and cost are important considerations. It is also an excellent device to control the brightness of backlighting quickly and reliably, making it an ideal choice for any portable electronic device, LCD monitor, or industrial lighting system.

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