AL1771/1772
PFC CONTROLLER + SINGLE/DUAL DIMMABLE LINEAR LED DRIVER
Description
Pin Assignments
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.
(Top View)
TP
REF1
DVCC
NC
16
15
14
1
2
3
4
5
6
7
8
FAULTB
LEDPG
FB
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.
13 COMP
AVCC
12
EP
PWM1
DGND
NC
11 GD
10 AGND
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.
9
CS
LED1
TSSOP-16EP (Type DX) (AL1771)
(Top View)
REF2
REF1
16
15
14
1
2
3
4
5
6
7
8
FAULTB
LEDPG
FB
DVCC
PWM2
PWM1
DGND
LED2
13 COMP
AVCC
EP
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).
12
11 GD
10 AGND
9
CS
LED1
Features
TSSOP-16EP (Type DX) (AL1772)
High PFC Controller and Dimmable Linear LED Driver in One
Package
Valley Detection to Achieve Low Switching Loss and High
Efficiency
Applications
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%
1-Channel Dimmable Connected Light Bulbs
2-Channel Tunable White Connected Bulbs
Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling
Lights
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
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 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 24
www.diodes.com
August 2018
© Diodes Incorporated
AL1771/1772
Document number: DS41314 Rev. 1 - 2
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