400V linear regulators deliver constant LED current in compact packages

Linear constant-current regulators from Diodes are designed for driving LED strings from an off-line or DC power supply. The AL5890 regulators are available in a range of packages.

The integrated design includes a power transistor and it is available in 10, 15, 20, 30, and 40mA variants. A single device or multiple devices in parallel can be used to source or sink enough current for long LED strings, with an overall accuracy of less than ±2.0mA (typical), says Diodes, working over a wide ambient temperature range of -40 to +105 degree C.

The two-pin PD123 design means it can be inserted directly in the LED string in low-side AC or DC, or high-side AC or DC linear configurations without any external resistors. The AL5890 is designed to tolerate DC voltages of up to 400V and can be used in off-line applications up to 230V AC. Thermal foldback protection is included, which prevents system failure by reducing the current in the event of high operating temperatures. As well as lowering the overall bill of materials, it also provides an effective solution to tackling EMI without the need for additional switching inductors.

Packaging options include PDI123, SOT89-3L, and TO252-3L to help address heat dissipation in various LED lighting applications including LED lamps, commercial LED fixtures, emergency lighting, signage and downlights, as well as decorative and architectural lighting.

Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets, providing diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC/DC converters and controllers, DC/DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. Diodes also has timing, connectivity, switching, and signal integrity products for high-speed signals.