High brightness LED with constant current buck regulator listed next year

National Semiconductor listed high brightness LED with constant current buck regulator, the maximum driving efficiency of 95%.

National Semiconductor (NationalSemiconductor) listed the constant current buck regulator with high brightness LED. Including 1WLED with "LM3402", 3WLED "LM3404" and 5WLED "LM3405" a total of 3 models. These new products reduce the power loss by reducing the reference voltage. From general purpose to industrial and automotive applications, for a variety of LED lighting.

The driving current LM3402 can output 525mA. Maximum drive efficiency up to 95%. Enable terminal with adjustable brightness through PWM input. The reference voltage for current sensing is 0.2V. The input voltage range is from 6 to 42V. The model also includes the same performance, the input voltage range of 6 ~ 75V "LM3402HV".

LM3404 and LM3402 have the same function, the drive current can output 1.2A. Like LM3402, the model also includes an input voltage range of 6 to 75V "LM3404HV". LM3404 and LM3404HV are able to drive 3W and 5W with 700mA and 1A currents by LED.

The driving current LM3405 can output 1A. The model also includes an internal set of switching frequencies of 550kHz "LM3405Y" and 1.6MHz "LM3405X"". Input voltage range of 3 ~ 22V, with internal compensation function. Enable/DIM terminal with PWM brightness adjustment.

LM3402 has begun production delivery. 8 pin Mini SOIC package. 1000 bulk purchase price of $1.35, LM3402HV $1.65. LM3404 has begun to supply samples, scheduled to start production in November 2006. 8 pin SOICNARROW package. LM3405 is scheduled to begin in November to supply samples, in January 2007 began mass production. With 8 pin Mini SOIC package and a 6 pin ThinSOT23 package.