The trouble comes as the number of LEDs in series grows. You can think of LED drivers as variable-voltage regulators that adjust their voltage output until the desired amount of current flows through ...

The proposed Design Idea uses a technique which allows the parallel-driven LED strings to work within a specified regulated current range by precisely injecting a reference current (IB ) into multiple ...

These features allow the LT3796-1 to satisfy the needs of some specific LED applications. For instance, in high reliability lighting, the controller can be configured to drive two LED strings in ...

High Efficiency DC/DC Converter The switching converter’s design needs to ensure efficient and reliable operation of the LED driver. 7†-10†panel sizes commonly used in media interface devices ...

Typical ICs can drive eight, 12 or 16 strings of leds. iWatt has integrated high voltage support (up to 56V) and adaptive switching to overcome thermal problems, enabling the new device to drive up to ...

With high voltage support up to 56V the iW7032 is capable of driving more parallel strings of LEDs from a single IC than existing solutions, reducing component count for TV manufacturers. Typical ICs ...

National Semiconductor has introduced a chip for balancing current in parallel strings of lighting LEDs. Applications are expected in street lights and other high power luminairs. “Without balancing, ...

The string he purchased had 28 LEDs – seven each in four colors, a controller box with one push button and a power cord. Without even knowing what is inside the controller box, the cost of the ...

1. Parallel LT3932 1.5-A LED drivers yield 3-A machine-vision LED pulses with long off-times relative to standard PWM dimming frequencies.

A power-limit circuit can be added to the circuit in Fig. 1 to limit the overall power when there is a large voltage variation for parallel strings of LEDs, with the result shown in Fig. 2.

Suppose we want to drive an LED string with 400 mA. Drivers U1 and U2 (MAX16803) are good for automotive use because they have a high input-voltage range, excellent thermal qualities, and the ...