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LC5545LD

Description
Single-Stage Power Factor Corrected Off-Line Switching Regulators
File Size272KB,11 Pages
ManufacturerSANKEN
Websitehttp://www.sanken-ele.co.jp/en/
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LC5545LD Overview

Single-Stage Power Factor Corrected Off-Line Switching Regulators

LC5540LD Series
Single-Stage Power Factor Corrected
Off-Line Switching Regulators
Features and Benefits
• Integrated on-width 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 rectifier)
• Integrated bias assist circuit (improves the startup
performance, suppresses V
CC
voltage droop during
operation, allows reduction of VCC capacitor value as well
as use of a ceramic capacitor)
• 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
Description
LC5540LD series is a quasi-resonant topology switching
power supply IC, designed for input capacitorless applica-
tions, and making it possible for systems to comply with the
harmonics standard (IEC61000-3-2 class C). It incorporates
separate controller and power MOSFET chips. The control-
ler adapts the average current control method for realizing
high power factors, and the quasi-resonant topology contrib-
utes to high efficiency and low EMI noise. The rich set of
protection features helps to realize low component counts,
and high performance-to-cost power supply.
The LC5540LD devices are intended for isolated designs.
The incorporated MOSFET has a V
DSS
(min) rating from
650 V (LC5545LD and LC5546LD) to 800 V (LC5548LD).
The R
DS(on)
(max) is 1.9
Ω
(LC5546LD) to 3.95
Ω
(LC5545LD). It is capable of a maximum output power
of 20 W on 230 VAC supply to 16 W on universal supply
(LC5546LD) 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.
Package: 8-pin DIP
Not to scale
Applications
• LED lighting fixtures
• LED light bulbs
Typical Application
F1
L1
D1
VAC
C1
D3
D4
C2
C9
D9
U1
LC554xLD
8
D/ST
C3
Control
Part
S/GND VCC OCP FB
1
2
3
4
R7
C5
R2
(Rocp)
R3
C6
D7
PC1
C7
OVP
6
D5
S/GND
5
NF
PC2
R6
D6
C17
R1
R9
PC1
R12
C4
DZ2
DZ1
C12
U2
C8
R5
D2
L2
T1
D8
PC2
C10
Q1
R13
R11
C13
R17
-
+
C14
R16
R14
R15
R18
C15
R19 R20
C16
LED
C11
R8 R10
R4
LC5540LD-DS
SANKEN ELECTRIC CO., LTD.

LC5545LD Related Products

LC5545LD LC5540LD LC5546LD LC5548LD
Description Single-Stage Power Factor Corrected Off-Line Switching Regulators Single-Stage Power Factor Corrected Off-Line Switching Regulators Single-Stage Power Factor Corrected Off-Line Switching Regulators Single-Stage Power Factor Corrected Off-Line Switching Regulators
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