Linear regulators suit LED lighting

5 August 2009 Opto-Electronics

New from ON Semiconductor is a series of two-terminal linear constant current regulators ideal for driving current in automotive, industrial signage and architectural LED lighting applications.

They operate over a wide range of input voltages and provide engineers a simple and cost-effective solution for regulating current in their applications.

The new regulators are based on patent-pending self biased transistor technology and are targeted for a broad range of LED application with varying input voltage. By regulating the voltage over a wide range, the devices ensure constant brightness over the operating voltage range. The series is designed with a negative temperature coefficient to protect LEDs from thermal runaway at extreme voltage and operating temperatures.

The NSI45 series is offered in 20 mA, 25 mA and 30 mA device options available in SOD-123 and SOT-223 packages. They are available in ±10% and ±15% steady state regulated current tolerance. The series is rated at 45 V with an operating temperature range of -40°C to 85°C and maximum junction temperature of 150°C. The SOD-123 is a 3,7 x 1,6 x 1,2 mm surface mount package and can dissipate 230 mW at 85°C with 500 mm/1 ounce copper on the board. The SOT-223 is a 7,0 x 6,5 x 1,6 mm surface mount package, dissipates 630 mW at 85°C with 500 mm/1 ounce copper on the board and is suitable for extreme thermal operating environments. The devices are qualified to stringent automotive standard AEC101. In addition, they are lead-free, RoHS compliant and use a halogen-free mould compound.

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