LC5500 Datasheet, PDF (1/40 Pages) Sanken electric – LC5500 Series Single-Stage Power Factor Corrected Off-Line Switching Regulators

Application Information
LC5500 Series Single-Stage Power Factor Corrected
Off-Line Switching Regulators
Introduction
The LC5500 series is the power IC for the isolated type
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 series is housed in either DIP8 or
TO-220F-7L packages, depending on output power
capability. The rich set of protection features helps to real-
ize low component counts, and high performance-to-cost
power supply.
Features and Benefits
• DIP8 package (LC551xD/LC552xD) and TO-220F-7L
package (LC552xF)
• 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 output
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-width limit circuit
DIP8
TO-220F-7L
(LF 3051)
TO-220F-7L
(LF 3052)
TO-220F-7L
(LF 3054)
Figure 1. The LC5500 series packages for lower wattage versions
are fully molded DIP8s, with pin 7 removed for greater isolation. For
higher wattages, the TO-220F-7L fully molded package is provided,
with three leadform options, all which provide a separation between
pins 1 and 2.
• 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): auto restart, OVP-
activating pins vary by product series:
OVP-Activating Pins
Series
VCC
ISENSE
OVP
OCP
LC551xD
×
×
–
×
LC552xD
×
–
×
×
LC552xF
×
–
×
×
▫ Overload protection (OLP): auto restart
▫ Thermal shutdown (TSD): halts switching operation and
latches in the off-state
The product lineup for the LC5500 series provides the following options:
Part
Number
MOSFET
V_DSS(min)
(V)
R_DS(on)
(max)
(Ω)
Isolation
Package
P_OUT*
(W)
230 VAC
Universal
(Wide)
LC5511D
3.95
Non-
13
10
LC5513D
1.9 ^isolated
20
16
DIP8
LC5521D
3.95
13
10
650
LC5523D
20
16
1.9 Isolated
LC5523F
TO-220F-
60
40
LC5525F
1.1
7L
80
55
*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 an
applications with low output voltage or short duty cycle.
Part Number Assignment
LC55nna
A BCD
A Product series name
B
Indicates non-isolated or isolated:
1 – Non-isolated, 2 – Isolated
C
On-resistance of the incorporated MOSFET:
1 – 3.95 Ω, 3 – 1.9 Ω, 5 – 1.1 Ω
D
Indicates the package:
D – DIP8, F – TO-220F-7L
LC5500-AN, Rev.1.2
SANKEN ELECTRIC CO., LTD.