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The AL5815 and AL5816 are 5-terminal adjustable constant current LED linear controllers offering excellent temperature stability and current capability. They can work with a wide input voltage range from 4.5V to 60V. With its low 200mV current sense FB voltage, it controls the regulation of LED current with minimum power dissipation compared with traditional linear LED drivers. This makes it ideal for medium to high current LEDs.
The device has an internal output drive up to 15mA, which enables it to drive external Bipolar transistors or MOSFETs. It also provides the capability to drive longer LED chains with low drop out voltage and multiple LED channels.
AL5815 and AL5816 have their LED current adjusted and controlled by a sense resistor connected across FB pin and GND. The voltage across this resistor is controlled to a precise 0.2V thus controlling the current.
The AL5815 has an enable (ENB) pin. Bringing ENB low to enable the device and turn on external transistor. Bring ENB high puts the device into a low quiescent current shutdown state. The AL5815 has a turn on delay built in which makes sure there is not a high current surge at startup. The average LED current can be adjusted by applying a low frequency PWM signal less than 200Hz to the ENB pin.
If high speed dimming is required the AL5816 has replaced the enable pin with a fast PWM pin. This device can run at frequencies greater than 20kHz.
AL5815 and AL5816 are available in SOT25 package.
Tight Current Sense Tolerance : ± 3%
Low Startup Current: 100µA Typical
Low Operation Current: 210µA (Switching Frequency at 4kHz)