AP1688

Document number: DS36603 Rev. 2 - 2

1 of 10

www.diodes.com

February 2015

© Diodes Incorporated

AP1688

A Product Line of

Diodes Incorporated

AC/DC, HIGH PF, HIGH EFFICIENCY, UNIVERSAL MAINS LED DRIVER CONTROLLER

Description

The AP1688 is a high performance AC/DC PFC and constant current

controller for universal mains LED driver applications. The device is a

buck controller which operates as a boundary conduction mode

(BCM) to achieve high efficiency and easy EMI.

An open loop algorithm is adopted in the AP1688, which will make the

system achieve excellent line and load regulations with high PF for

universal mains input.

The AP1688 features fast start-up, low start-up current, low operation

current and high efficiency. It also has rich protection features

including over voltage, short and open circuit, over current, over

temperature protection.

The AP1688 is available in SO-8 package.

Pin Assignments

(Top View)

(SO-8/ M Package)

Features



Optimized for Buck Topology



Boundary Conduction Mode (BCM) Operation to Achieve High

Efficiency



High Power Factor > 0.9



High Efficiency > 90%



System Current Accuracy: ±5%



Good Line Regulation and Load Regulation



Low Start-up Current



Tight CC Regulation Performance for Universal Input Mains

Voltage Range



Eliminates Control Loop Compensation Circuitry



Easy EMI



Open-load and Reload Detection



Over Temperature Protection



Over Current Protection



Over Voltage and Short and Open Circuit Protection



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



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

Applications



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

<1000ppm antimony compounds.

Typical Applications Circuit

FB

OUT

CS

GND

VS

VA

VCC

T1

C4

+

-

D1

TVS

Q1

D2

R1

R2

R5

R4

C5

C3

C2

C1

C6

BD1

R3

R6

R7

L1

L2

8

2

3

6

4

7

5

1

2

3

4

8

7

6

5

NC

VS

VA

CS

FB

GND

OUT

VCC