AL1771 (NRND)

Description

The AL1771 is a high integration chip with an Offline High Power Factor Correction (PFC) controller and a single/dual-channel Linear LED driver in one package. AL1771 implements an optimized 2-stage topology for a wide power range of connected lighting applications. It is targeted for 1-Channel Dimmable and 2-Channel Tunable White and various Connected Lighting applications.

Based on Primary Side Regulation (PSR) implementation, the PFC controller does not require Opto-coupler and any secondary feedback circuit to save overall BOM cost and it operates at Quasi-Resonant (QR) mode where MOSFET is turned on at the valley of the drain voltage, which minimizes switching loss and results in high efficiency.

The key merits of the Single Dimmable Linear LED driver attribute to excellent dimming performance, low standby power, ease of system implementation, and great product scalability. The AL1771 has protection features to ensure robust and safety operation of the Connected Lighting systems. The AL1771 can support applications with LED current (Up 1500mA) and is available in low thermal resistance package TSSOP-16EP.

Feature(s)

• High PFC Controller and Dimmable Linear LED Driver in one package;
• Valley Detection to Achieve Low Switching Loss and High Efficiency 
• Input Voltage Range for LED Driver (DVCC): 6.5V to 30V
• Each channel independent PWM dimming Control 
• Adjustable Reference Current by external reference resistors
• LED Current Accuracy ≤ ±4%
• Maximum LED Current 1500mA for AL1771 and 750mA Per channel to AL1772
• Adaptive Thermal Management® (ATM) scheme to minimize power dissipation
• Low Standby Power Mode with Automatically enter and exit
• High Frequency E-Flicker Free PWM dimming with Deep Dimming Capability
• Protections: 
• PFC controller:
• Undervoltage Lockout (UVLO)
• Overvoltage Protection (OVP)
• Overcurrent Protection (OCP)
• Output Short Protection (OSP)
• Over-Temperature Protection (OTP): Thermal Shutdown and Auto Thermal Recovery
• Dimmable Linear LED driver: 
• Undervoltage Lockout (UVLO)
• LED string Open/Short protection;
• Over-temperature protection (OTP): Thermal shutdown and auto thermal recovery
• Fault Reports: UVLO, OTP, LED Open/Short 
• Low system BOM

Application(s)

• 1-Channel Dimmable Smart Connected Light (SCL) Bulbs
• Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling Lights