AP1685

Document number: DS37311 Rev. 1 - 2

1 of 14

www.diodes.com

September 2014

© Diodes Incorporated

AP1685

A Product Line of

Diodes Incorporated

OFFLINE, HIGH PF, HIGH EFFICIENCY LED DRIVER IC

Description

The AP1685 is a high performance AC/DC power factor corrector for

mains dimmable LED driver applications. The device uses Pulse

Frequency Modulation (PFM) technology to regulate output current

while achieving high power factor and low THD. It operates as a BCM

(Boundary Conduction Mode) which is good for EMI.

The AP1685 internally integrates a 500V high voltage MOSFET which

can realize a lower BOM cost. The AP1685 provides accurate

constant current (CC) regulation while removing the opto-coupler and

secondary control circuitry. It also eliminates the need of loop

compensation circuitry while maintaining stability. It can meet the

requirement of IEC6100-3-2 harmonic standard.

The AP1685 features low start-up current, low operation current. It

adopts valley on switching mode to achieve high efficiency. It also has

rich protection features including over voltage, short circuit, over

temperature protection.

The AP1685 is available in SO-7 package.

Applications



Non-dimmable LED drivers

Pin Assignments

(Top View)

1

2

3

4

7

6

5

S

CS

RI

GND

FB

VCC

Drain

SO-7

Features



Boundary Conduction Mode (BCM) Operation to Achieve High-

efficiency



High PF and Low THD (PF>0.9, THD<30%)



High Efficiency



Low Start-up Current



Tight LED Current



Tight LED Open Voltage



Valley-mode Switching to Minimize the Transition Loss



Internal Integrated 2.5A/500V MOSFET can Cover up to 10W



Easy EMI



Internal Protections:



Under Voltage Lock Out (UVLO)



Leading-edge Blanking (LEB)



Output Short Protection



Output Open Protection



Over Temperature Protection



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) 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.