LC552XD Datasheet, PDF (1/9 Pages) Sanken electric – Single-Stage Power Factor Corrected Off-Line Switching Regulator IC

LC5523D
Single-Stage Power Factor Corrected
Off-Line Switching Regulator IC
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
performance, suppresses VCC voltage droop during
operation, and allows use of low-rated ceramic capacitor
on VCC pin)
• Integrated Leading Edge Blanking (LEB) circuit
• Integrated maximum on-time limit circuit
• Protection features:
▫ Overcurrent protection (OCP): pulse-by-pulse
▫ Overvoltage protection (OVP): pins VCC, OVP, and
OCP, auto restart
▫ Overload protection (OLP): auto restart
▫ Thermal shutdown (TSD): latched shutdown
Package: 8-pin DIP
Not to scale
Description
The LC5500 series is the power IC for the LED driver
which has an incorporated power MOSFET, designed for
input capacitorless applications, and making it possible for
systems to comply with the harmonics standard (IEC61000-
3-2 class C). The controller adapts the average current
control method for realizing high power factors, and the
quasi-resonant topology contributes to high efficiency and
low EMI noise.
The rich set of protection features helps to realize low com-
ponent counts, and high performance-to-cost power supply.
The LC5523D is intended for isolated designs. The incor-
porated MOSFET has a V_DSS(min) rating of 650 V and
R_DS(on)(max) of 1.9 Ω. It is capable of a maximum output
power of 20 W on 230 VAC supply and 16 W on universal
input supply (85 to 265VAC) 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 applica-
tions with low output voltage or short duty cycle.
Applications
• LED lighting fixtures
• LED light bulbs
Typical Application
F1
L1
VAC _C1
D1
D2 L2
T1
D3
D4
C8
R5
C2
D9
U1
L C5523D
8
6
D/ST OVP
S/GND
5
NC
D5
R1
C4
C3
PC2
Control
Part
R6
C17
D6
S/GND VCC OCP FB
1
2
34
C18 DZ3
R7 _R21
R4
C5
C6
PC1
R_OCP
R3
D7
C7
C11
D8
C9
R8 ^R10
PC2
C10
Q1
R13
R9
PC1 _R11
R12
C13
R17
DZ2
DZ1
-
C12 ^{U2 +}
C14
R14
R15
R18
C15
R16
R19 R20
LED
C16
LC5523D-DS
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
November 26, 2012