LM3445-208277EV/NOPB

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The LM3445-208277EV/NOPB is an evaluation board with LED drivers, designed to provide precision current regulation for the illumination of LED arrays. This board features an LED driving topology that accommodates up to two LED strings with four LEDs in series. It can be used with either AC or DC power supplies, and features an overcurrent protection circuit and overvoltage protection circuit. Additionally, the evaluation board also features a temperature-controlled shutdown and soft-start circuitry, to protect the LEDs from thermal damage.

The LM3445-208277EV/NOPB evaluation board has a wide range of applications, such as street lamps, automotive lighting systems, and architectural lighting. Its main function is to provide precise and efficient illumination of an LED array. The evaluation board has adjustable output current from 0 to 250mA, and a maximum output voltage of 40V, making it suitable for a wide range of applications. In addition, the board has built-in dimming support for pulse dimmable current, pulsed output current, and uniformly dimmed current.

The LM3445-208277EV/NOPB evaluation board works according to a buck topology architecture. It consists of an input voltage device that has two diodes to protect against it from high-voltage and two capacitors to suppress the radio-frequency interference. The input is fed to an high-side driver current-mode PWM controlled converter, the LM3445, which is a step-down high-side current controller. The LM3445 drives an N-Channel MOSFET, which is then connected to the LED string with a parallel capacitor. The output of the MOSFET is connected to an LCD, to enable the users to adjust the intensity of the LED array.

Additionally, the LM3445-208277EV/NOPB evaluation board is equipped with a voltage divider circuit to sense the LED string voltage. It also incorporates an on-board LED current sense resistor. The LED current flowing through the sense resistor is then monitored by the LM3445, which compares it with a programmed reference current and adjusts the cycle-by-cycle peak current limit to regulate the LED current with accuracy. The board also has an overcurrent protection circuit to protect against excessive current, an overvoltage protection circuit to protect against excessive voltage, and a Temperature-controlled shutdown circuit, to vary the LED current thus protecting the LEDs from thermal damage.

In summary, the LM3445-208277EV/NOPB evaluation board is a high-performance LED driver board suitable for a wide range of applications. It has a buck topology architecture, with adjustable output current and voltage, temperature controlled shutdown, overvoltage and overcurrent protection, and dimming support for pulse dimmable current, pulsed output current, and uniformly dimmed current. The evaluation board also features a voltage divider circuit and on-board LED current sense resistor, to ensure accurate current regulation for the LED array.

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