LM3445-230VFLBK/NOPB

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Evaluation Boards - LED Drivers

The LM3445-230VFLBK/NOPB is a highly integrated monolithic switching regulator designed for driving high power LEDs. It features a wide input voltage range, a constant current output and adjustable output current, making it suitable for a variety of applications and light sources. The LM3445-230VFLBK/NOPB supports a wide range of constant current outputs from a single pin and can be paralleled with other external MOSFETs for load current sharing.

The LM3445-230VFLBK/NOPB has an operating temperature range of -40°C to +80°C, making it suitable for use in outdoor or harsh environment applications. The board also features built-in diodes for reverse voltage protection and over-temperature, over-current and surge protection, making it extremely robust and reliable. With its high ESD tolerance, it is able to withstand severe electrical disturbances without sustaining a permanent damage.

Application Field

The LM3445-230VFLBK/NOPB is ideally suited for driving high power LEDs in applications that require a wide input voltage range, high efficiency, and a constant current output. These include automotive, aviation and marine lighting applications; retrofit lamp, torch, and stage lighting; and general area lighting. The board also finds applications in street lighting, indoor lighting, and backlighting.

The board is also suitable for portable applications such as handheld flashlights and lanterns as it has a very low standby current, allowing it to be used in portable lighting products with minimal impact on battery life. It can also be used in medical devices and wearable devices due to its low quiescent current.

Working Principle

The LM3445-230VFLBK/NOPB works on a buck converter topology. It uses a high-side MOSFET to provide a constant current output from a wide input voltage range via a single pin. This MOSFET is controlled using a current sense voltage (VCS) on the same pin that is used to measure the LED current. The LM3445-230VFLBK/NOPB is also equipped with an adjustable current limiting feature to prevent overcurrent caused by LED malfunctions or LED short circuit.

Additionally, the board has UVLO (Under Voltage Lock Out) and OVP (Over Voltage Shut Down) features that protect the chip from abnormal input voltage. The device also has an adjustable cycle-by-cycle current limit which helps in balancing current across parallel MOSFETs.

The integrated over-temperature protection in the LM3445-230VFLBK/NOPB helps protect the board from high temperature damage. The board also features reverse-voltage protection to protect against reverse voltage applied to the input and reverse current flowing in the output.

Conclusion

The LM3445-230VFLBK/NOPB is a highly integrated monolithic switching regulator that is designed for driving high power LEDs in a variety of applications. It features wide input voltage range, a constant current output, adjustable output current, built-in diodes for reverse voltage protection, and over-temperature, over-current, and surge protection. Its high ESD tolerance makes it ideal for portable applications, automotive, aviation and marine lighting, and harsh environments.

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