Diodes Incorporated introduces the AL1665 high power factor LED driver-controller, which is for LED lighting installations up to 100 W.
This single-stage, fly-back, and buck-boost diode is meant to drive an external MOSFET (metal oxide semiconductor field effect transistor) to manage LED loads while maintaining a high power factor.
The AL1665 maintains a high switching efficiency and is a well-sized and efficient controller that will help in cutting down the number of components used in LED lighting installations.
The AL1665 uses the PSR (primary side regulation) control method, which eliminates the optocoupler and compensated components and can provide accurate CC (constant current) regulation. Using PSR means smaller solutions—those that eat up less space on the PCB—can be designed as it eliminates secondary-side feedback components, and in the long run, reduces material cost.
It integrates multiple internal protections that are all meant to make it more reliable. They include under voltage lockout (UVLO), over temperature protection (OTP), over current protection (OCP), user programmable NTC based thermal foldback, internal thermal foldback protection (TFP), shorted current sense protection, secondary diode short protection, CS short protection, output over voltage protection (OVP), winding short circuit protection, and output short protection (OSP). (If by any chance the controller reaches 165°C, the OTP feature will be triggered to cause a latch mode protection.)
When compared to other Diodes models; like the AL1663S or the AL1663RS, for example, the AL1665S provides more efficiency (>85%) and more high power factor (>0.9). Its analogue dimming range is also wider—from 0.05 to 2.5V.
The AL1665 LED Driver. Image courtesy of Diodes Incorporated.
The capability to dim between 0.5% to 100% makes this diode well suited for commercial LED applications, especially those that require the output levels to be adjusted to save on power, or for beautification purposes around malls and retail stores. The general areas include:
AL1665S works perfectly with ANSI-approved dimmers. When using a PWM input, you can adjust the output to between 0V and 10V, or between 0V and 2.5V with an analogue input voltage. This makes it simpler to come up with lighting setups that can be managed locally or remotely.
The AL1665 should be a game changer for LED lighting installations, especially because it maintains a high switching efficiency and it makes it possible to cut down on the number of components required in connected, commercial, and dimmable LED lighting installations.