AL6562

Document Number: DS37542 Rev. 2 - 2

12 of 16

www.diodes.com

February 2015

© Diodes Incorporated

AL6562

Single Stage LED Driver with PFC

One of the major applications of AL6562 is to provide a single stage power module with high PF for LED lighting. The following circuit, Figure 4,

shows a simplified fly-back AC-DC converter with both CC and CV feedback from output side, to prevent overload and also provide an over-

voltage protection facility.

CY1

AC

input

C1

Z1

ZCD

COMP

INV

GD

CS

MULT

Vcc

GND

AL6562

(5)

(2)

(1)

(7)

(4)

(6)

(3)

(8)

Snuber

Opto-

Coupler

CY2

Secondary

side loop

control

R10

R9

R8

R7

C5

R4

D1

C4

R3

R1

R2

C3

C2

R5

M1

R6

R11

R12

C6

Vo

Figure 4 Single Stage PFC Isolated LED lighting

With its high performance, the AL6562 offers the following advantages that make this solution an appropriate method against the traditional

PWM controller, where a good PF value is required:



The input capacitance can be reduced to replace a bulky and expensive high-voltage electrolytic capacitor (as required by regular

offline SMPS) by a small-size, cheaper film capacitor.



Transition mode ensures low turn-on losses in MOSFET and higher efficiency can be achieved.



Lower parts count means lower material cost, as well as lower assembly cost for limited space.