AL1771/1772

Document number: DS41314 Rev. 1 - 2

1 of 24

www.diodes.com

August 2018

© Diodes Incorporated

AL1771/1772

PFC CONTROLLER + SINGLE/DUAL DIMMABLE LINEAR LED DRIVER

Description

The AL1771/1772 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. AL1771/1772 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/Dual Dimmable Linear LED driver

attribute to excellent dimming performance, low standby power, ease

of system implementation, and great product scalability. It supports E-

flicker free High Frequency 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 AL1771/1772, the LED driver

Section will automatically enter the low-power mode for power saving

purpose to be in compliance with Energy Star standby power

requirement for Connected Lighting. Integrates Adaptive Thermal

Management (ATM) scheme to minimize non-productive power

dissipation.

The AL1771/1772 has protection features to ensure robust and safety

operation of the Connected Lighting systems. The AL1771/1772 can

support applications with LED current (Up 1500mA) and is available

in low thermal resistance package TSSOP-16EP (Type DX).

Features



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:



Under Voltage Lockout (UVLO)



Over Voltage Protection (OVP)



Over Current Protection (OCP)



Output Short Protection (OSP)



Over-Temperature Protection (OTP): Thermal Shutdown

and Auto Thermal Recovery

Dimmable Linear LED Driver:



Under Voltage Lockout (UVLO)



LED String Open/Short Protection



Over-temperature Protection (OTP): Thermal Shutdown and

Auto Thermal Recovery

Pin Assignments

(Top View)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

TP

REF1

DVCC

NC

PWM1

DGND

NC

LED1

FAULTB

LEDPG

FB

COMP

AVCC

GD

AGND

CS

EP

TSSOP-16EP (Type DX) (AL1771)

(Top View)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

REF2

REF1

DVCC

PWM2

PWM1

DGND

LED2

LED1

FAULTB

LEDPG

FB

COMP

AVCC

GD

AGND

CS

EP

TSSOP-16EP (Type DX) (AL1772)

Applications



1-Channel Dimmable Connected Light Bulbs



2-Channel Tunable White Connected Bulbs



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

Lights



Fault Reports: UVLO, OTP, LED Open/Short



Low System BOM



Ambient Temperature Operating Range -40°C to +125°C

TSSOP-16EP (Type DX)

: 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) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-free/ for more in

formation 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.