AL1666 Universal AC Line Dimmable LED Driver-Controller

The AL1666 from Diodes is a high-performance single-stage Flyback and buck-boost controller targeting dimmable LED lighting applications. This device is a primary side regulation (PSR) controller which can provide accurate constant current (CC) regulation without an optocoupler and secondary control circuitry. It is operating at BCM mode which results in good EMI and efficiency and keeps high PF and low THD under universal input voltage. The AL1666 has rich protection features integrating multiple protections including under-voltage lock out (UVLO), output over-voltage protection (OVP), output short-circuit protection (OSP), over-current protection (OCP), winding short-circuit, secondary diode short, internal thermal fold-back protection (TFP), and over temperature protection (OTP). The AL1666 can support analog/PWM dimming modes. When a 0 V_DC to 2.4 V_DC signal is applied on ADIM pin, the device will operate in analog dimming mode; when a digital signal is applied on PWMD pin and the ADIM pin is connected with hundreds of nF capacitors, the device will work at PWM-to-DC dimming mode and is available in a SO-8 package.