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Constant-Current Regulators

ON Semiconductor (Phoenix, AZ) has expanded its portfolio of constant-current regulators (CCRs) to include the NSI50350A. The simple and robust device is designed to provide a thermally-efficient and cost-effective alternative to passive/discrete components or driver IC solutions for current regulation of LEDs.

The device is ideal for a variety of 1 W lighting applications including automotive, architectural lighting, and signage. The NSI50350A CCR incorporates SBT technology and regulates current over a wide voltage range. It is designed with a built-in LED driver and has a negative temperature coefficient to protect LEDs from thermal runaway at extreme voltages and currents. The 350 mA ± 10% steady state regulation current (Ireg) is ideal for driving 1.0 W LEDs; for applications requiring 2.0 W LEDs, two of the NSI50350A CCRs can be placed in parallel. The device has an operating temperature range of −55 °C to +175 °C.

The NSI50350A requires no external components, allowing it to be designed as either a high or low-side regulator. The high anode-cathode voltage (Vak) rating of 50 V maximum enables the device to withstand voltage surges that are common in automotive, industrial and commercial signage applications. The device turns on immediately and is at 20 percent of full regulation with only 0.5 V Vak applied.

(ON Semiconductor)