AL5802-7

AL5802-7 is a linear mode current sink LED driver. It combines a high-gain NPN transistor with a pre-biased NPN transistor to make a simple small-footprint LED driver. The LED current is set by an external resistor connected from REXT pin (6) to GND pin (4). The internal high-gain transistor develops approximately 0.6V across the external resistor. The AL5802’s open-collector output can operate from 0.8V to 30V, making it suitable for industry-standard 5V to 24V power supplies without additional components. PWM dimming of the LED current can be achieved by either driving the BIAS pin (2) with a low-impedance voltage source, or driving the EN pin (3) with an external open-collector NPN transistor or open-drain N-channel MOSFET. It is used in applications such as linear LED drivers, LED signs, and offline LED luminaries.

• Reference voltage VRSET = 0.65V
• 0.8V to 30V open-collector output
• Negative temperature co-efficient automatically reduces the LED current at high temperatures
• Supply voltage range from 4.5V to 30V
• Collector-emitter breakdown voltage is 40V min at (IC = 1.0mA, IB = 0)
• Emitter-base breakdown voltage is 6V minimum at (IE = 10µA, IC = 0)
• Collector cutoff current is 50nA maximum at (VCE = 30V, VEB(OFF) = 3.0V)
• Base cutoff current is 50nA maximum at (VCE = 30V, VEB(OFF) = 3.0V)
• Base-emitter saturation voltage is 0.85V maximum at (IC = 10mA, IB = 1.0mA)
• Operating ambient temperature range from -40°C to +125°C