AL1791/1792/1793/1794

Document number:37957 Rev. 3 - 2

1 of 18

www.diodes.com

September 2015

© Diodes Incorporated

AL1791/1792/1793/1794

Single/Dual/Triple/Quad-Channel Current-Ratio-Optimized LED Driver

with Analog and PWM Dimming

U-DFN-4030-14

Description

The AL1791/1792/1793/1794 (or collectively AL179x), a single/multi-

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 wireless MCU as an emerging smart-connected

lighting system configuration. The key merits attribute to cost-

effectiveness, dimming performance, low standby power, ease of

system implementation, and great scalability. AL1791, AL1792,

AL1793, and AL1794 are 1-channel, 2-channel, 3-channel, and 4-

channel LED drivers, respectively.

The IC is available in U-DFN-4030-14 package.

Features



Input Voltage Range: 6.5V to 30V



1/2/3/4-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 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 -40°C to +125°C



U-DFN4030-14:

Available in “Green” Molding Compound (No Br,

Sb)



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



H

alogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

Top View

(U-DFN4030-14)

Applications



1-Channel Dimmable Smart Connected Light (SCL)

Bulbs



2-Channel Tunable White SCL Bulbs



3-Channel Tunable White or Color SCL Bulbs



4-Channel Tunable White+Color SCL Bulbs



Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling

Lights



Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green",

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

EN

PWM4/GND

PWM3/GND

PWM2/GND

PWM1

LED1

LED2/GND

VIN

REF

FAULTB

LEDPG

LED4/GND

LED3/GND

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14