SANKEN ELECTRIC CO., LTD.

Description

The LC5560LD series is the power IC for the non-iso-

lated type LED driver which has an incorporated power

MOSFET, designed for input capacitorless applications, and

making it possible for systems to comply with the harmon-

ics standard (IEC61000-3-2 class C).

The controller adapts the average current control method for

realizing high power factors, and the quasi-resonant topol-

ogy contributes to high efficiency and low EMI noise.

(LC5565LD). It is capable of a maximum output power

of 20 W on 230 VAC supply to 16 W on universal supply

(LC5566LD) based on the thermal rating. Note that the

maximum output power can be up to 120% to 140% of

this value. However, it may be limited in applications with

low output voltage or short duty cycle. The PWM oscilla-

tion frequency ranges from 60 kHz (LC5566LD) to 72 kHz

(LC5565LD).

The series is housed in DIP8 packages. The rich set of pro-

tection features helps to realize low component counts, and

high performance-to-cost power supply.

Features and Benefits

• Integrated on-time control circuit (it realizes high power

factor by average current control)

• Integrated startup circuit (no external startup

circuit necessary)

• Integrated soft-start circuit (reduces power stress during

start-up on the incorporated power MOSFET and output

rectifier)

• Integrated bias assist circuit (improves startup

operation, and allows use of low-rated ceramic capacitor

on VCC pin)

• Integrated Leading Edge Blanking (LEB) circuit

• Integrated maximum on-time limit circuit

• Dual-chip structure, with an avalanche-guaranteed power

MOSFET (allows simplified surge suppressing circuits)

• Protection features:

▫ Overcurrent protection (OCP): pulse-by-pulse

▫ Overvoltage protection (OVP): latched shutdown

▫ Overload protection (OLP): latched shutdown

▫ Thermal shutdown (TSD): latched shutdown

LC5560LD Series Single-Stage Power Factor Corrected

Off-Line Switching Regulators for LEDs

Typical Application

Package: 8-pin DIP

Not to scale

LC5560LD Series

LC5560LD-DS

5

1

2

3

D/ST

8

S/GND VCC

Control

Part

C2

C5

D8

U1

D1

D3

D2

D4

F1

L1

C1

D5

C4

DZ1

COMP

D6

T1

C3

D7

L2

LED

OCP

ISENSE

VREF

R1

C6

D9

(Rocp)

R2

R3

R4

R5

R6

R7

VAC

C8

C7

C9

C11

C12

LC556xLD

6

4

C10

R8

Applications

• LED lighting fixtures

• LED light bulbs