LM3502SQX-25/NOPB

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The LM3502SQX-25/NOPB, a device from Texas Instruments, is classified under PMIC - LED Drivers. It is a high-efficiency and high-density LED driver designed to drive RGBW LEDs in general lighting applications. The integrated logic and protection features help to improve system reliability and reduce design time. This article provides an overview of the application field and working principle of this powerful LED driver.

Overview of LM3502SQX-25/NOPB

The LM3502SQX-25/NOPB is a high efficiency and high density LED driver capable of driving up to 8 channels with up to 25mA per channel. It features an input voltage range of 4.5V to 38V and an adjustable output current of up to 2.55A per channel. The device includes an integrated current limit and thermal shutdown circuits for thermal protection. The integrated 15-bit I2C PWM register can provide smooth gamma correction and enable a wide range of dimming options. The device also features an integrated enable control, open-circuit and short-circuit fault protection, and over-temperature protection.

The device has a high efficiency of up to 95% and can operate at a junction temperature of up to 150°C. It has an operating junction temperature range of -40°C to 150°C and is available in a Pb-free, low-profile PowerWise QFN-6 package.

Application Field

The LM3502SQX-25/NOPB is a high-efficiency LED driver designed to drive RGBW LEDs in general lighting applications. It is ideal for applications such as LED strips and LED bulbs, LED luminaires, LED fixtures such as pendants, downlights, and high bay, and large scale LED displays. The device\'s integrated logic and protection features help to improve system reliability and reduce design time.

Working Principle

The LM3502SQX-25/NOPB is a synchronous buck converter designed for driving high power LEDs. It consists of a high-side p-channel MOSFET and a low-side n-channel MOSFET connected in series, a gate driver and an internal low-side to high-side current sense amplifier to regulate the current. The integrated synchronous FETs provide high efficiency and reduce switching losses. The gate driver provides the necessary voltage to drive the MOSFETs. The current sense amplifier measures the current passing through the low-side MOSFET and adjusts the output current according to the set point.

The device features an integrated enable control, open-circuit and short-circuit fault protection, and over-temperature protection. The enable pin can be used to shutdown the LED driver. The device also has an adjustable soft start and thermal shutdown for better thermal and EMI performance. The integrated I2C PWM register provides smooth gamma correction and enable a wide range of dimming options.

Conclusion

In conclusion, the LM3502SQX-25/NOPB is a high-efficiency and high-density LED driver designed to drive RGBW LEDs in general lighting applications. The device features an input voltage range of 4.5V to 38V and an adjustable output current of up to 2.55A per channel. It includes integrated logic and protection features to improve system reliability and reduce design time. The device is ideal for LED strips and LED bulbs, LED fixtures and displays, and general lighting applications that require high efficiency and high density LED drivers.

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