LED driver powers three strings of eight
Linear Technology
LT3496
Fixed-frequency current-mode architecture ensures stable operation over a wide range of supply and output voltages.
The LT3496 is a 2MHz DC/DC convertor designed by Linear Technology to operate as a three-channel constant current LED driver.
Each of the LT3496's three channels can drive up to eight 500mA LEDs in series, enabling it to drive up to 24 x 500mA LEDs at efficiencies up to 96%.
All three channels are operated by an independent true colour PWM signal, enabling each to be dimmed independently to ratios as high as 3000:1.
A fixed-frequency current-mode architecture ensures stable operation over a wide range of supply and output voltages.
A frequency adjust pin enables the user to program the frequency between 330kHz and 2.1MHz to optimise efficiency while minimising external component size.
The LT3496's thermally enhanced 4 x 5mm QFN package provides a highly compact solution footprint for 50W LED applications.
The LT3496 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations.
With an external sense resistor, the user programs the output current range of each channel.
Each of the three independent driver channels utilises an internal 750mA, 45V NPN switch and has a built in gate driver for PMOS disconnect.
Other features include open LED protection and thermal limiting.
The LT3496EUFD is available from stock in a thermally enhanced 28-lead 4 x 5mm QFN package.
1000-piece pricing starts at US $3.50 each.
The LT3496IUFD is available from stock and is tested and guaranteed to operate over a -40 to +125C operating junction temperature, it is priced at US $4.20 in 1000-piece quantities.
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