LDS8640-008-T2 Integrated Circuits (ICs)

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PMIC (Power Management IC) has enabled much greater complexity and sophistication of the semiconductor chip. Specifically, LED Drivers are one of the most widely used power management ICs to regulate and control the energy consumption in different electrical systems. In this article, we will focus on the LDS8640-008-T2 application field and working principle.

LDS8640-008-T2 is a type of integrated circuit (IC) used to provide a constant current source to drive LEDs. It is a Single Channel DC/DC LED Driver and possesses Over-current Protection, Integrated Inductor and Soft-start functions. The LDS8640-008-T2 is suitable for applications demands high power and low-side current, such as industrial lighting, commercial lighting and automotive headlight.

In practical application, the LDS8640-008-T2 can be power supply with 35V input and provide up to 40V output. It accept Pulse width modulation (PWM) signals from various type of microcontroller and can provide a constant current from 1 to 6A with up to 2A of ripple current. It is able to drive 6 LEDs with 1.5A current or drive 10 LEDs with 1A, this allows for flexible design with energy efficiency and performance.

The working principle of the LDS8640-008-T2 is based on DC/DC buck topology. The IC requires two supplies: the control supply (Vdd) and the load supply (Vin). When a PWM signal is applied on VPWM and the enable switch is ON, the current across the inductor starts to increase and thus generate a reverse EMF in the inductor. When the current reach the peak, the switch opens to let the stored energy discharged to the LEDs, thus lighting them up. The IC integrated a current sensing circuit and a feedback control circuit, with an external resistor required to adjust the current level. This design is used to ensure constant current output over a range of input voltage.

In conclusion, LDS8640-008-T2 LED Driver IC is suitable for LED lighting applications demands high power and low-side current. It is able to provide constant current to a maximum level of 6A or drive up to 10 LEDs with a maximum current of 1A. The IC requires two supplies, the control supply (Vdd) and the load supply (Vin). The working principle is based on DC/DC buck topology and the external resistor is required to adjust the current level.

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