LM3519MK-20/NOPB

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LED Drivers are devices that manage the current being supplied to light-emitting diodes (LED) in order to maintain a constant, safe operating luminance. The LM3519MK-20/NOPB is a high-efficiency LED driver specifically designed for Mid-Power LED applications on a 180V bus. Offered in a Pb-Free, 5-pin SOT-23 package, the device features a constant current output of 20mA and a wide input voltage range of 4.5V to 18V.

The LM3519MK-20/NOPB provides excellent efficiency and high accuracy in an ultra-small SOT-23 package. The device also has a relatively high transient load capability, which allows it to survive load transients of up to 10x the rated current for up to 400ms. Additionally, the LM3519MK-20/NOPB is protected from short-circuit and current overshoot conditions.

The LM3519MK-20/NOPB’s application field is extensive, ranging from LED lighting, traffic signals, automotive and industrial lighting, handheld flashlights and headlamps to aviation and medical uses. The device is designed to provide a high-efficiency switching regulator dedicated to the control of a single, high efficiency LED. The device features a constant current output, which is better suited to LED loads than a constant voltage supply. Additionally, the device features a wide input voltage range of 4.5V to 18V, which makes the device suitable for everything from battery-operated systems, to wall adapters and automotive systems.

The LM3519MK-20/NOPB contains a MOSFET switch and a control circuit. The control circuit uses a buck converter topology to regulate the current flowing through the LED. The device maintains a constant current as long as the incoming voltage VIN is greater than the minimum switching voltage Vswitch. When this voltage is exceeded, the device begins to switch rapidly between the MOSFET switch and the control circuit. This causes the voltage to drop in each cycle, which in turn causes the current to drop and the LED to dim. The control circuit regulates the current flowing through the LED, by constantly measuring the LED current and adjusting the duty cycle of the MOSFET switch accordingly.

The LM3519MK-20/NOPB is an ideal LED driver for applications that require high efficiency, flexibility and accuracy. With its wide input voltage range of 4.5V to 18V, high transient load capabilities, short circuit protection and current overshoot protection, the LM3519MK-20/NOPB provides reliable and efficient performance for a variety of LED lighting applications.

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