LM2796TL/NOPB Integrated Circuits (ICs)

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LED power supply can be divided into two kinds, the first kind is directly connected to the AC or DC power supply for lighting and current limiting, the second kind is to design the power converter to control the output voltage and current. LM2796TL/NOPB is a type of integrated power converter, it is belong to the control of the output voltage and current of the LED power supply, and it is protected against over current and over voltages. Therefore, LM2796TL/NOPB application field and working principle can be classified into PMIC - LED Drivers.

LM2796TL/NOPB is a monolithic integrated circuit with 8-pin plastic package. It has a high degree of integration, on the basis of a 9V power supply, it can control the output current up to 600mA. Besides, it can be used in series and parallel connection, so that it can provide larger capacity current. It also features protection interface and fault mode protection, increased safety and prolonged lifespan. Its electronic properties supports multiple applications, such as LED lighting and lighting, automotive lighting, LCD backlighting and charging systems.

LM2796TL/NOPB simplifies the design of LED power supply, and is designed for the LED lighting application. It can provide constant LED current with ultra-low ripple. The design of the programmable LED current and constant temperature ensures that the LED system can meet the environmental requirements of various applications. In addition, LM2796TL/NOPB can be used with the PWM control or voltage control mode to make the LED current to regulate dimming using the analog or PWM inter-device connections. It can match the size of the steps with small ripple current.

The working principle of LM2796TL/NOPB is to use the current detection of the output LED current, keeping track of its current loop. First, the LED current control frequency was set at 20kHz, and then the error amplifier was used to measure the voltage of the sense resistor. It then amplified the output voltage error signal to a higher level than the power transistor switch, and send current error signal to the internal comparator, which then generated a pulse signal to close the MOSFET.

When the LM2796TL/NOPB output current (IOFFSET) has reached the peak point, the PWM signal will be output to turn off the power transistor switch, avoiding the current overshoot. Then, the average value of the current will be set from the external current set (ISMV) port, which can be connected to the external potentiometer to adjust the output current of the LM2796TL/NOPB. For example, when the external current set increases, the average value of the output current will increase, so that the output current can be kept a constant.

In addition, the LM2796TL/NOPB also has an internal soft start circuit, which includes the current limit threshold selection. The current limit setting voltage (VLI) can be adjusted by the non-powder potentiometer, so that the LED can be well protected from over current. LM2796TL/NOPB also has some key protection functions, such as over voltage protection, over current protection, and thermal shutdown.

In summary, LM2796TL/NOPB is an integrated power converter designed to control the output voltage and current of LED power supplies. LM2796TL/NOPB can be used in series and parallel connection, so that it can provide larger capacity current. It has the function of temperature protection and overcurrent protection, increased safety and prolonged its lifespan. The working principle of LM2796TL/NOPB includes the current detection of the output LED current, current limit threshold selection, and soft start circuit, etc. Therefore, it can be classified into PMIC - LED Drivers.

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