AL1663/AL1663R

Document number: DS38466 Rev. 2 - 2

1 of 15

www.diodes.com

March 2017

© Diodes Incorporated

AL1663/AL1663R

UNIVERSAL FLYBACK AND BUCK-BOOST

SINGLE STAGE DIMMABLE LED CONTROLLER

Description

The AL1663/AL1663R is a high performance single stage Flyback

and

Buck-boost

controller,

targeting

dimmable

LED

lighting

application. It is a primary side regulation (PSR) controller which can

provide accurate constant current (CC) regulation without opto-

coupler and secondary control circuitry. It is operating at BCM mode

and switching at the valley which results in good EMI and efficiency.

With working in constant on time, the system achieves high PF and

low total harmonic distortion (THD) under universal input voltage.

The AL1663/AL1663R can support multiple dimming modes. When a

0.3V to 2.4V DC signal is applied on APWM pin, the device will

operate in analog dimming mode. When a digital signal is applied on

APWM pin, the device works at PWM dimming mode. And for AL1663

When a digital signal is applied on PWMD pin and the APWM pin is

connected with a hundreds of nF capacitor, the device will work in

PWM-to-DC dimming mode.

The AL1663/AL1663R features low start-up current and low operation

current. It integrates multiple protections including over voltage, short

circuit, over current and over temperature protection.

The AL1663/AL1663R is available in SO-8 package.

Features



Primary Side Regulation without Opto-coupler



Valley Switching for Low Switching Loss



Low Start-up Current



High PF and Low THD



High Efficiency



Tight LED Current Variation Range



Tight Output Open Voltage Variation Range



Support both PWM Dimming and Analog Dimming



Internal Protections



Under Voltage Lock Out (UVLO)



Output Over Voltage Protection (OVP)



Output Short Protection (OSP)



Over Current Protection (OCP)



Thermal Fold-back Protection (TFP)



Over Temperature Protection (OTP)



Low System Cost



Package: SO-8



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



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

Pin Assignments

(Top View)

AL1663

AL1663R

SO-8

SO-8

Applications



General LED Lighting Driver with Dimming Function



General Purpose Constant Current Source



LED Backlighting Driver



Smart LED Lighting

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 "Gr

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

<1000ppm antimony compounds.

1

2

3

4

8

6

5

7

APWM

PWMD

COMP

CS

GND

FB

OUT

VCC

1

2

3

4

8

6

5

7

NC

FB

CS

GND

OUT

APWM

VCC

COMP