AL1781/1782
Single/Dual Dimmable Linear LED Driver
Description
Pin Assignments
The AL1781/1782, a single/dual-channel dimmable Linear LED driver
with PWM dimming control, is targeted for 1-Channel dimmable and
2-Channel tunable Smart Connected Lighting (SCL) applications. It
serves as the LED driving element along with AC-DC Power
Conversion Block and Intelligent wireless MCU as an emerging
connected lighting applications.
(Top View)
16
15
VIN
NC
1
2
3
4
5
6
7
8
REF1
TP
14 FAULTB
13 LEDPG
NC
PWM1
EP
12
11
10
9
GND
GND
NC
The AL1781/1782 key merits attribute to dimming performance, low
standby power, ease of system implementation and great scalability.
It supports High Frequency E-flicker free PWM dimming with Deep
Dimming Capability: Support 40kHz down to 4%, 10kHz down to
1.0%, 4kHz down to 0.4%, or 1kHz down to 0.1% with good dimming
linearity. When no PWM signal is detected by AL1781/1782, it will
automatically enter the low-power mode for power saving purpose to
be in compliance with Energy Star standby power requirement for
connected lighting requirements. Integrates Adaptive Thermal
Management (ATM) scheme to minimize non-productive power
dissipation.
GND
NC
NC
LED1
LED1
TSSOP-16EP (Type DX) (AL1781)
(Top View)
16
15
VIN
NC
1
2
3
4
5
6
7
8
REF1
REF2
PWM2
PWM1
GND
14 FAULTB
13 LEDPG
EP
The AL1781/1782 has protection features, including Under-Voltage-
Lockout (UVLO), LED string Open/Short protection and Over-
temperature protection (OTP).
12
11
10
9
GND
GND
NC
LED2
LED1
LED2
LED1
AL1781 is a single channel and AL1782 is a dual-channel LED driver.
They can support high LED current (up to total 1500mA) applications
and they are available in Low thermal resistance TSSOP-16EP (Type
DX) package.
TSSOP-16EP (Type DX) (AL1782)
Applications
Features
1-Channel Dimmable Connected Light Bulbs
2-Channel Tunable White Connected Bulbs
Input Voltage Range: 6.5V to 30V
Multiple-Channel of Connected Lighting System
Connected LED Tubes, Panel Lights, Troffers, and Ceiling Lights
Independent PWM Dimming Control for Each Channel
Adjustable Reference Current by External Reference Resistors
LED Current Accuracy ≤ ±4%
Maximum LED Current 1500mA for AL1781 and 750mA Per
Channel for AL1782
Adaptive Thermal Management (ATM) Scheme to Minimize
Power Dissipation
Automatically Enter and Exit Low Standby Power Mode
High Frequency E-flicker Free PWM Dimming
Internal Protections:
Under Voltage Lockout (UVLO);
LED String Open/Short Protection;
Over-Temperature Protection (OTP): Thermal Shutdown and
Auto Thermal Recovery
Fault Reports: UVLO, OTP, LED Open/Short
Ambient Temperature Range -40°C to +125°C
TSSOP-16EP (Type DX): “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) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
1 of 18
www.diodes.com
August 2018
© Diodes Incorporated
AL1781/1782
Document number: DS41312 Rev. 1 - 2
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