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AL1791

Single-Channel Current-Ratio-Optimized LED Driver with Analog and PWM Dimming

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Description

The AL1791, a single-channel LED driver with analog and PWM dimming control, is targeted for Tunable White/Color Smart Lighting application. It serves as the LED driving element along with AC-DC Power Conversion Block and Intelligent MCU as emerging smart light bulb configuration. The key merits attribute to cost-effectiveness, dimming performance, low standby power, ease of system implementation, and great scalability.

Feature(s)

Input Voltage Range: 6.5V to 30V, 1-channel LED drivers: independent Analog or PWM dimming control for each channel
Reference Current: Adjustable by an external reference resistor
Ratio-optimized currents for 4 independent LED channels (AL1794 only): Suitable for Tunable White and Tunable Color
Low Standby Power: With EN pin
E-flicker free PWM dimming: Support 4KHz down to sub-1%
Internal Protections: Under Voltage Lockout (UVLO)
LED string open/short protection
Over temperature protection (OTP): Thermal fold-back and Thermal shut down
Fault Reporting: UVLO, OTP, Open, and Short
LED Power Good Reporting
Low system BOM cost
Ambient Temperature Range -40°C to +105°C

Application(s)

Tunable Color Smart LED Light Bulbs
Tunable White Smart LED Light Bulbs
Dimmable Smart LED Light Bulbs
LED Power Supply
Smart Lighting
DC-DC
LED Drivers

Product Specifications

Product Parameters

AEC Qualified	No
Compliance (Only Automotive supports PPAP)	Standard
Topology	Linear LED Driver
Minimum Supply Voltage (V)	6.5 V
Maximum Supply Voltage (V)	30 V
Maximum V_{OUT (V)}	30 V
Number of Channels	1
LED Current Sense Voltage (mV)	1500 mV
Output Current (mA)	1000 mA
Channel Max. Output Current (mA)	1000 mA
Accuracy (%)	2.5 %
Dimming	Analog and PWM
Temperature Range (°C)	-40 to 125 °C

Technical Documents

Recommended Soldering Techniques

TN1.pdf