Electronic Design

Constant-Current Regulators For LEDs Feature Wide Input Range

A series of two-terminal constant-current regulators for driving current applications in automotive, industrial signage, and architectural LED lighting systems operate over a wide range of input voltages. As a result, the NSI45 regulators ensure constant brightness over the operating voltage range. The devices come in 20-mA, 25-mA, and 30-mA versions available in an SOD-123 package or an SOT-223 package. Steady-state regulated current tolerances are either ±10% or ±15%. The series is rated at 45 V with an operating temperature range of ?40°C to 85°C and a maximum junction temperature of 150°C. The SOD-123 package is a 3.7- by 1.6- by 1.2-mm surface mount package and can dissipate 230 mW at 85°C with 500 mm/ounce copper on the board. The SOT-223 SMT package measure 7.0 by 6.5 by 1.6 mm, and dissipates 630 mW at 85°C with 500 mm/ounce copper on the board. This package is well-suited for extreme thermal operating environments. The devices are qualified to the stringent automotive standards of AEC101. They are RoHS-compliant and use a halogen-free mold compound. The NSI45 (SOD-123 package) costs $0.0545 each, and the NSI450 (SOT-223 package) costs $0.090 each in quantities of 10,000. ON SEMICONDUCTOR, Phoenix, AZ. (602) 244-6600.



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