AL1791/1792/1793/1794
Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver
with Analog and PWM Dimming
U-DFN-4030-14
Description Pin Assignments
The AL1791/1792/1793/1794 (or collectively AL179x), a single/multi-
Top View
channel LED driver with analog and PWM dimming control, is
(U-DFN4030-14)
targeted for Tunable White/Color Smart Lighting application. It serves
as the LED driving element along with AC-DC Power Conversion
Block and Intelligent wireless MCU as an emerging smart-connected EN 1 14 VIN
lighting system configuration. The key merits attribute to cost-
PWM4/GND 2 13 REF
effectiveness, dimming performance, low standby power, ease of
system implementation, and great scalability. AL1791, AL1792,
3 12 FAULTB
PWM3/GND
AL1793, and AL1794 are 1-channel, 2-channel, 3-channel, and 4-
channel LED drivers, respectively.
PWM2/GND 4 11 LEDPG
The IC is available in U-DFN-4030-14 package.
5 10
PWM1 LED4/GND
LED1 6 9 LED3/GND
LED2/GND 7 8 GND
Features Applications
Input Voltage Range: 6.5V to 30V 1-Channel Dimmable Smart Connected Light (SCL)
Bulbs
1/2/3/4-channel LED drivers: independent Analog or PWM
dimming control for each channel 2-Channel Tunable White SCL Bulbs
3-Channel Tunable White or Color SCL Bulbs
Reference Current: Adjustable by an external reference resistor
Ratio-optimized currents for 4 independent LED channels 4-Channel Tunable White+Color SCL Bulbs
(AL1794 only): Suitable for Tunable White and Tunable Color
Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling
Low Standby Power: With EN pin Lights
E-flicker free High Frequency PWM dimming with Deep Dimming
Capability: Support 10KHz down to 1.0%, 4KHz down to 0.4%,
or 1KHz down to 0.1%
Internal Protections: Under Voltage Lockout (UVLO), LED string
open/short protection
Over-temperature protection (OTP): Thermal shutdown and auto
thermal recovery
Fault Reporting: UVLO, OTP, Open, and Short LED Power
Good Reporting
Low system BOM cost
Ambient Temperature Range -40C to +125C
U-DFN4030-14: Available in Green Molding Compound (No Br,
Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. Green Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
AL1791/1792/1793/1794
Typical Applications Circuit
VLED1
85~265Vac
2700K
AP3983C
AC-DC
Conversion
VIN
X8
V adjustment
IN
signal
3.3V AL1791
LED1
R
FAULT
R
LEDPG
FAULTB
LEDPG
Wireless/Color
EN
management
PWM1
REF
MCU
GND
R
SET
Figure 1. 1-Channel Dimmable White
VLED1
85~265Vac
2700K 6500K
AP3983C
AC-DC
Conversion
VIN
X8 X8
V adjustment
IN
signal
3.3V AL1792
R LED1
FAULT
LED2
R
LEDPG
FAULTB
LEDPG
Wireless/Color
EN
management
PWM1
REF
MCU
PWM2
GND
R
SET
Figure 2. 2-Channel Tunable White
VLED2
VLED1
85~265Vac
G R B
AP3983C
AC-DC
Conversion
VIN
V adjustment
IN
signal
3.3V AL1794
LED1
R
FAULT
LED2
R
LEDPG
LED3
FAULTB
LED4
LEDPG
Wireless/Color
EN
management
PWM1
REF
MCU
PWM2
GND
R
SET
PWM3
PWM4
Figure 3. 3-Channel Tunable Color
2 of 18
AL1791/1792/1793/1794 September 2015
Diodes Incorporated
www.diodes.com
Document number:37957 Rev. 3 - 2
ADVANCED INFORMATIO