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PMIC - LED Drivers

LM2753SDX is a LED driver module manufactured by Texas Instruments. It is designed to provide LED lighting control solutions for a vast range of automotive and commercial applications. The LM2753SDX integrates all required control, drive, and power stages in a single, high-efficiency and cost effective module. It is optimized to provide a wide range of interchangeable automotive-grade components, enabling superior system performance, lower cost and reduced development costs.

The LM2753SDX module supports automotive lighting applications, and is tailored for driving both high-power and low-power LEDs. High-power LED applications are commonly used for exterior and interior lighting of automotive vehicles. Low-power LED applications are more suitable for LED interior lighting, dashboard lighting, and signal luminaires.

Lighting Control System

The LM2753SDX module provides a complete lighting control system with superior system performance. It includes a powerful lighting control engine, three independent channels for controlling up to six low-power LEDs, and two current-mode PWM blocks for driving up to four high-power LEDs. The module can be configured for PWM, FSK and HID-type applications. It features adjustable dead times and slew rates, optimized switching frequency and output voltage to ensure a smooth current waveform, and over-voltage, over-current and short-circuit protection.

Working Principle

The LM2753SDX module works on the principle of closed loop current regulation. It uses a closed loop current regulator to ensure that the output current remains constant, regardless of changes in input voltage or load conditions. The module provides two output current limiting switch (CML) configurations – one for high-power LED applications and one for low-power LED applications. The CML permits a user to adjust the LED current from maximum to minimum to best match his LED type.

The LM2753SDX module also includes safety features for protection against over-voltage, over-current, and short-circuit conditions. The module can be configured to automatically self-adjust for safe operation in the presence of load transients or when the input voltage fluctuates. The user can also program the module for power-off functionality when either the input voltage or frequency falls below a certain level.

Conclusion

The LM2753SDX module provides an optimized solution for automotive and commercial LED lighting applications. It integrates all required control, drive and power stages in a single, cost effective module. It features adjustable dead times and slew rates, optimized switching frequency and output voltage to ensure a smooth current waveform, and over-voltage, over-current, and short-circuit protection. The module provides superior system performance, lower cost and reduced development costs.

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