LTM7503SAD

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The LTM7503SAD is a high efficiency white LED driver from Linear Technology. It is designed for powering white LEDs from a 12V or 24V DC input and it can drive up to 3 series-connected white LEDs with up to 1A of current. This LED driver is especially useful for automotive and industrial applications where a high-efficacy light source is required.

The LTM7503SAD application field includes LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar Graphs and more. It can be used as an indicatior light, backlighting, and illuminating, or any other kind of lighting application. The system\'s first order current regulation maintains constant current, even when the input voltage varies.

The LTM7503SAD features a wide input voltage range of up to 48V, up to 98% efficiency, and a high switching frequency of up to 2.2MHz. It also has reverse current protection and open LED detection for safety. The device has a low number of external components, making it easier to use in a variety of applications, as well as being cost effective.

The basic working principle of the LTM7503SAD is that when the DC input is connected, an internal linear regulator is used to convert it to a regulated voltage of 40V. This voltage then provides the high-voltage base drive voltage for the external switches. The two external FET switches (N-channel MOSFETs) are turned ON and OFF alternately by the internal timer controller, and the ON time and total switching frequency are adjusted using an external resistor.

When one of the FET switches is turned ON, the current passes through the external sense resistor, and the voltage across the resistor is proportional to the current passing through. An internal comparator senses this voltage and sets the peak current to the required level. The current is then regulated across the LEDs and varies with the input voltage.

The main advantages of using the LTM7503SAD are its high efficiency, wide input voltage range, low external components, and reverse current protection. This LED driver is an ideal choice for automotive and industrial applications where a high-efficacy light source is required.

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