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LC5555LD Datasheet Preview

LC5555LD Datasheet

Single-Stage Power Factor Corrected High Efficiency Non-Isolated Buck LED Driver

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LC5550LD Series
Single-Stage Power Factor Corrected
High Efficiency Non-Isolated Buck LED Driver
Features and Benefits
• PWM and quasi-resonant topology
• Integrated on-time control circuit (it realizes high power
factor by average current control)
• 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): latched shutdown
Overload protection (OLP): latched shutdown
Thermal shutdown (TSD): latched shutdown
Package: 8-pin DIP
Description
LC5550LD series are PWM and quasi-resonant topology
non-isolated buck LED driver ICs. They incorporate sepa-
rate controller and power MOSFET chips, and are designed
for input capacitorless applications. The controller adapts
the average current control method for realizing high power
factors. The rich set of protection features helps to realize
low component counts, and high performance-to-cost power
supply.
Applications
• LED lighting fixtures
• LED light bulbs
Not to scale
Typical Application
R1 D6
D3
VAC
D1
D4
D2
5
NF
6
ISENSE
D/ST
8
U1
LC5550LD
CO MP
4
3 OCP/BD
2 VCC
1 S/GND
C1
R2
C3
C2
C4 C5 C6
R3
R5
R4
D5
T1
C7 R6
LED
LC5550LD-DS
SANKEN ELECTRIC CO., LTD.
July 9, 2012
http://www.Datasheet4U.com




SANKEN

LC5555LD Datasheet Preview

LC5555LD Datasheet

Single-Stage Power Factor Corrected High Efficiency Non-Isolated Buck LED Driver

No Preview Available !

LC5550LD
Series
Single-Stage Power Factor Corrected
High Efficiency Non-Isolated Buck LED Driver
Selection Guide
Part
Number
MOSFET
VDSS(min)
(V)
RDS(on)
(max)
(Ω)
PWM Operation
Frequency, fOSC(typ)
(kHz)
On-Time
tON(MAX)(typ)
(μs)
LC5555LD
650
3.95
72
9.3
LC5556LD
650
1.9
60
11.2
*Based on the thermal rating; the allowable maximum output power can be
up to 120% to 140% of this value. However, maximum output power may be
limited in such an application with low output voltage or short duty cycle.
The polarity value for current specifies a sink as "+," and a source as “,” referencing the IC.
LC5550LD Absolute Maximum Ratings Unless specifically noted, TA is 25°C
Characteristic
Symbol
Notes
Drain Current1
IDPeak
LC5555LD Single pulse
LC5556LD Single pulse
Single Pulse Avalanche Energy2
Input Voltage for Control Part (MIC)
OCP/BD Pin Voltage
COMP Pin Voltage
ISENSE Pin Voltage
Allowable Power Dissipation of
MOSFET3
EAS
VCC
VOCP
VCOMP
VSEN
PD1
LC5555LD ILPeak = 2.0A, VDD = 99 V, L = 20 mH
LC5556LD ILPeak = 2.7A, VDD = 99 V, L = 20 mH
Mounted on a 15 mm × 15 mm PCB
Operating Ambient Temperature
TOP
Storage Temperature
Tstg
Channel Temperature
Tch
1Refer to MOSFET Safe Operating Area Curve.
2Refer to MOSFET Avalanche Energy Derating Coefficient Curve.
3Refer to MOSFET Temperature versus Power Dissipation Curve.
Pins
8–1
8–1
8–1
8–1
2–1
3–1
4–1
6–1
8–1
―−
―−
Rating
2.5
4.0
47
86
35
2.0 to 5.0
0.3 to 7.0
0.3 to 5.0
0.97
55 to 125
55 to 125
150
Unit
A
A
mJ
mJ
V
V
V
V
W
°C
°C
°C
LC5550LD-DS
SANKEN ELECTRIC CO., LTD.
2
July 9, 2012


Part Number LC5555LD
Description Single-Stage Power Factor Corrected High Efficiency Non-Isolated Buck LED Driver
Maker SANKEN
Total Page 11 Pages
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