AP1684

Document number: DS36547 Rev. 3 - 2

1 of 13

www.diodes.com

February 2014

© Diodes Incorporated

AP1684

A Product Line of

Diodes Incorporated

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

Description

The AP1684 is a high performance AC/DC power factor corrected

LED driver controller which is driving high voltage bipolar transistor.

The device uses Pulse Frequency Modulation (PFM) technology to

regulate output current while achieving high power factor and low

THD. It operates as a boundary condition mode (BCM) buck controller

which is good for EMI.

The AP1684 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 AP1684 features low start-up current, low operation current and

high voltage driving bipolar transistor. It adopts dynamic base driver

control technology and valley on switching mode to achieve high

efficiency. It also has rich protection features including over voltage,

short circuit, over temperature protection.

The AP1684 is available in SO-8 package.

Applications



LED Bulb Lamp



LED Down Light



GU10/E27



Other Non-dimmable LED Lighting

Pin Assignments

(Top View)

1

2

3

4

8

7

6

5

NC

RI

RM

CS

FB

GND

OUT

VCC

(SO-8/ M Package)

Features



Low Start-up Current



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



High Efficiency up to 92%



BCM Mode



Output Current Accuracy on IC Level: ±2%



Tight LED Open Voltage



Valley-mode Switching to Minimize the Transition Loss



BJT Transistor Driver



Dynamic Base Driver Control



Open-load and Reload Detection



Internal Protections:



Under Voltage Lock Out (UVLO)



Leading-edge Blanking (LEB)



Output Short Protection



Output Open Protection



Over Temperature Protection



Low System Cost



SO-8 Package



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.

Typical Applications Circuit

T1

OUT

+

VCC FB

OUT

CS

GND

C3

R7

R5

R6

R4

D1

C4

R3

Q1

AC

Input

F1

VR1

DB1

C2

L1

C1

R8

D2

R1

R2

RI

RM

R9

5

7

4

6

3

2

8