LM2759SDX/NOPB Integrated Circuits (ICs)

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The LM2759SDX/NOPB is a Pulse Width Modulator (PWM) controller used in LED Drivers that uses a high current switched mode current source. It is capable of driving up to 23A of load current to an LED, operating at efficiencies greater than 90%. The PWM controller accepts a programmable reference voltage and operates with a single feedback voltage representing the LED output current. This method offers much improved LED stability and accuracy, compared to linear LED regulating schemes.

The excellent power supply rejection and high gain of this chip allow very good stability in a non-isolated current regulation loop. In addition, the wide range of operating conditions (up to 23A) make the typical LM2759SDX/NOPB a good choice for controlling LEDs in applications such as outdoor lighting, backlighting, traffic and industrial lighting.

The operating principle of the LM2759SDX/NOPB is such that it monitors the output voltage and strives to keep it equal to the reference voltage. When the output voltage is greater than the reference voltage, the LM2759SDX/NOPB will reduce the duty cycle to decrease the voltage. On the other hand, when the output voltage is lower than the reference voltage, the duty cycle will be increased to raise the voltage. To ensure stable and fast operation, the device also monitors its internal temperature which is used to adjust the switching rate.

The LM2759SDX/NOPB also integrates various protections, such as overload protection, short-circuit protection, over-voltage protection and thermal protection. In addition, the device has two enable inputs, two soft start pins and fault status flag which can be set up and monitored through an I2C bus. Finally, the LM2759SDX/NOPB includes built-in EMI filters which significantly improve the performance in EMI-sensitive applications.

To summarize, the LM2759SDX/NOPB Pulse Width Modulator controller is suitable for LED drivers applications and provides reliable and stable operation. Moreover, it features a wide current driving range, good power supply rejection, integrated EMI filtering and built-in protection. Thus, the LM2759SDX/NOPB is a great choice for LED driver applications such as outdoor lighting, backlighting, traffic and industrial lighting, and many more.

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