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PMIC – LED Drivers

LED Driver ICs are integrated circuits that are extensively used for the purpose of driving LEDs. They convert other forms of energy into current and voltage as required by the LEDs. These LEDs are a current-driven devices and hence, require a properly designed current source to drive them. If the necessary current is not being provided, the glowing of the LEDs will be inadequate. In order to provide the necessary constant current to the LEDs, a proper driver has to be employed. The LT3478EFE#PBF is a high efficiency step-up current regulator that can be efficiently used as an LED driver.

Application Field

The LT3478EFE#PBF is a high efficiency step-up current regulator. It can be used for driving low to mediumbrightness LEDs. It can handle input voltage as low as 1V upto a maximum of 22V. It is ideal for applications like automotive and industrial lighting, as well as other low power lighting systems. It has built-in overvoltage, undervoltage and thermal protection to ensure the safety of the application.

Working Principle

The LT3478EFE#PBF is a switching regulator with a constant current control loop. It uses a 4-level pulse width modulation (PWM) technique to drive the output voltage. The input voltage is applied to the VIN pin, which is then compared with the feedback voltage (VFB). If the input voltage is higher than the feedback voltage, the PWM duty cycle increases and the output voltage is increased. The PWM duty cycle is modulated to regulate the output current, which is then fed back to the feedback pin. This current regulation loop ensures a constant current, which is then used to drive the LEDs. The constant current regulator also features high frequency switching, which helps reduce power dissipation in the maximum duty cycle mode. The overvoltage, undervoltage, and thermal protection prevents the circuit from operating outside its rated operating conditions.

Conclusion

The LT3478EFE#PBF is an efficient LED driver IC, which can be used for low to medium brightness LEDs. It is suitable for applications like automotive and industrial lighting, as well as other low power lighting systems. The 4-level PWM and the current regulation loop ensures the constant current, which is necessary for the proper functioning of the LEDs. The thermal, overvoltage, and undervoltage protection ensures the safety of the application and prevents it from operating outside its rated operating conditions.

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