AL1663/AL1663R

Document number: DS38466 Rev. 2 - 2

7 of 15

www.diodes.com

March 2017

© Diodes Incorporated

AL1663/AL1663R

Note:

8. These electrical characteristics are tested under DC condition. The ambient temperature is equal to the junction temperature of the device.

Application Information

The AL1663/AL1663R is a constant current high PF Flyback and Buck-boost controller with primary side regulation (PSR), targeting LED lighting

applications. The device eliminates the opto-couplers or the secondary feedback circuits, which will help to cost down the whole system. High

power factor is achieved by constant on time operation. In order to reduce the switching losses and improve EMI performance, quasi-resonant

open voltage protection, over current protection, thermal fold-back protection and over temperature protection. The AL1663/AL1663R can support

multiple dimming modes including analog dimming mode, PWM-to-DC dimming mode and PWM dimming.

T1

OUT

+

VCC

OUT

CS

GND

U1

R5

R6

R4

D1

C6

AC

Input

F1

VR1

DB1

C2

L1

C1

R10

FB

COMP

D2

C5

R14

C7

D3

Q1

Ccomp

Aux

PWMD

R9

D4

AL1663

APWM

Rcomp

Cvcc

Figure 1. AL1663 Typical Flyback Application Schematic

T1

OUT

+

VCC

OUT

CS

GND

U1

R5

R6

R4

D1

C6

AC

Input

F1

VR1

DB1

C2

L1

C1

R10

FB

COMP

D2

C5

R14

C7

D3

Q1

Ccomp

Aux

NC

R9

D4

AL1663R

APWM

Rcomp

Cvcc

Figure 2. AL1663R Flyback Application Circuit

9

12

15

18

21

24

27

290

295

300

305

310

V

CC

Voltage(V)