A new linear LED driver AL5802 Diodes

Diodes company launched AL5802 linear LED driver in the day before, to provide simple solutions, cost-effective and low electromagnetic interference.

The AL5802 SOT26 package, equipped with operation from 0.8V to 30V voltage range set open drain output, power supply can support 12V and 24V, LED current 20mA to 100mA, suitable for LED display device, lighting and automotive interior display applications.

The driver incorporates a high gain NPN transistor with a pre bias voltage (pre-biased) NPN output transistor with a rated current of 30V, sufficient to control up to nine low power series LED current.

This drive only requires an external accessory that is an external low value resistor to set the LED current. The built in high gain transistor reduces the power loss and ensures sufficient power supply by generating a reference voltage of 0.65V in the resistor. When the reference voltage has a negative temperature coefficient, the LED current is lowered automatically at high temperature, which can protect the LED and improve the reliability of the circuit.

Adjust the brightness of PWM function is simple, only to the bias of AL5802 (bias pin) pin applying a low impedance voltage, or through external contact type NPN transistor, or open drain N channel MOSFET to drive the enable pin (enable pin), to the current regulation LED string pulse width. AL5802 wide operating temperature range, covering -40 degrees C to 125 degrees C, in a limited space lighting applications, can be installed in a position very close to LED.