AL1677

Document number: DS37526 Rev. 1 - 2

1 of 13

www.diodes.com

November 2015

© Diodes Incorporated

AL1677

UNIVERSAL, HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER

Description

high-accuracy Buck LED-driver converter. The AL1677 topology

provides accurate constant current (CC) line and load regulation,

operating at boundary conduction mode (BCM) to ease in EMI/EMC

qualification and testing to meet the latest regulatory laws.

The AL1677 system removes the auxiliary winding and external high-

voltage MOSFET with few external components to create a low bill of

material (BOM) cost solution. The AL1677 has rich protection features

to enhance system safety and reliability. With thermal foldback

function, the AL1677 can reduce output current when the driver

’s

temperature is higher than the setting value.

The AL1677 is available in SO-8 package.

Features



> 90% Efficiency



Valley Detection to Minimize Switching Loss





Internal MOSFET up to 500V



Tight Current Sense Tolerance : ± 3%



Low Startup Current: 170µA



Low Operation Current: 100µA (Static)



Standard Inductor (no auxiliary winding)



Internal Protections

-

Undervoltage Lockout (UVLO)

-

Leading-Edge Blanking (LEB)

-

Cycle-by-cycle Overcurrent Protection(OCP)

-

Output Open/Short Protection(OVP/OSP)

-

Open-Load and Reload Detection

-

Thermal Foldback Function(TFP)

-

Over-Temperature Protection(OTP)



SO-8 Package



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



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

Pin Assignments

(Top View)

1

2

3

4

8

6

5

7

GND

ROVP

NC

VCC

D

D

CS

CS

SO-8

Applications



Retrofit LED Lamps



High Voltage DC-DC LED Driver



General Purpose Constant Current Source

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.