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The AL1665 is a high performance single stage flyback and buckboost controller, targeting dimmable LED lighting application. It is a Primary Side Regulation (PSR) controller which can provide accurate Constant Current (CC) regulation without opto-coupler and secondary control circuitry. It can be operated at BCM mode which results in low EMI and high efficiency, and keeps high Power Factor (PF) and low Total Harmonic Distortion (THD) under universal input voltage.
The AL1665 can support analog/PWM dimming modes. When a 50mV to 2.5V DC signal is applied on ADIM pin, the device will be operated in analog dimming mode. The analog dimming range is 5% to 100%. When a PWM signal is applied to NTC/PWM pin, the device will be operated at PWM dimming mode. The PWM dimming range is 0.5% to 100% (1k PWM dimming frequency).
The AL1665 features low operation current. It integrates multiple protections including overvoltage, short circuit, overcurrent and over-temperature.
The AL1665 is available in SO-8 (Standard) package.
Primary Side Regulation without Opto-Coupler
Valley Switching for Low Switching Loss
Low Start-Up Current
Support Analog and PWM Dimming
Analog Dimming Range: 5% to 100%
PWM Dimming Range: 0.5% to 100% (1k PWM Frequency)
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
CS Short Protection
Winding Short Circuit Protection
Secondary Diode Short Protection
Shorted Current Sense Protection
User Programmable NTC Based Thermal Foldback
Internal Thermal Fold-Back Protection (TFP)
Over Temperature Protection (OTP)
Low System Cost
High PF>0.9 and Low THD<20%
Tight LED Current Variation Range
LED Current Line Regulation: ±2%
LED Current Load Regulation: ±2% Full Load to Half Load