LC5223D and LC5226D
Off-Line DC / DC LED Driver ICs
Features and Benefits
• Buck and buck-boost topology; selectable by peripheral
circuit structure
• Built-in fixed reference voltage limiting constant current
control; high precision regulator improves current
precision and simplifies setting of current level
• Sleep function, with latch mode; input high, 3 V or more,
on REF pin turns off IC output to LEDs
• Enable function; input low on REF pin toggles IC output
to LEDs
• High input voltage; up to 250 V or 450 V, depending on
product
• Output Current: 1.0 A
• Built-in constant current control; PWM method, output
current adjustable by the voltage input on the REF pin
• External adjustable PWM dimming control
• Protection features:
▫
Open protection (OPP) with latched shutdown; protects
IC when a free-wheeling diode is open
▫
Undervoltage lockout (UVLO)
▫
Overcurrent protection (OCP) with latched shutdown;
variable OCP threshold linked to REF pin voltage
▫
Thermal shutdown (TSD) with auto restart
Description
LC5220 series is a non-isolating, simple and efficient LED
driver. The high voltage capability allows direct connection
to a wide range of supply voltages ranging from 25 to 400 V
(recommended). The LC5220 uses constant current mode
to drive LEDs. and buck and buck-boost voltage converters
can be configured.
A power MOSFET and controller IC are incorporated in
one package. Because few external parts are required, the
LC5220 is ideal for use in small-size LED light bulbs.
Various control requirements can be supported through the
REF pin, including peak current control, output on/off, and
sleep mode enable.
Moreover, there is a protection circuit for freewheeling
diode open, protection for a buck-boost voltage converter
open LED load, and a variable overcurrent protection func-
tion. These features improve safety for both the LC5220 and
the LEDs.
Applications
• LED lighting fixtures
• LED light bulbs
Packages
DIP8
Not to scale
Typical Application
V
IN
LEDs
August 8, 2012
Line
Filter
AC
Input
C
IN
REG VBB
R
1
C
1
D
1
C
3
V
LED
LC5220
OUT
GND
SEN
R
S
L
1
R
2
C
2
REF
PWM
C
PWM
An example of a buck voltage converter application circuit
LC5223D/26D-DS
SANKEN ELECTRIC CO., LTD.
LC5223D and
LC5226D
Selection Guide
Part
Number
LC5223D
LC5226D
Package
Maximum Input
Voltage
V
BB
(max)
(V)
250
450
Output MOSFET
R
DS(ON)
(max)
(Ω)
1.3
3
Off-Line DC / DC LED Driver ICs
DIP8
The polarity value for current specifies a sink as "+," and a source as “−,” referencing the IC.
Absolute Maximum Ratings
Unless specifically noted, T
A
is 25°C
Characteristic
Main Power Supply Voltage
Output Breakdown Voltage
Output Current
1
PWM Pin Voltage
2
REF Pin Input Voltage
2
SEN Pin Voltage
Allowable Power Dissipation
3,4
Operating Ambient Temperature
Storage Temperature
Junction Temperature
1
The
Symbol
V
BB
V
O(BR)
I
O
V
PWM
V
REF
V
SEN
P
D
T
A
T
stg
T
J
Pulse width
≥
1
μs
LC5223D
LC5226D
LC5223D
LC5226D
Pulse width
≥
1
μs
Notes
Pins
6–8
5–4
5–4
2–8
3–8
4–8
―
―
―
―
Rating
250
450
250
450
1.0
−0.3
to V
Z
−0.3
to V
Z
−0.3
to 4.0
1.73
−40
to 105
−40
to 150
150
Unit
V
V
V
V
A
V
V
V
W
°C
°C
°C
On Sanken evaluation PCB
output current value may be restricted based on duty cycle, ambient air temperature, or heat dissipation conditions. In any case, please be sure
to keep from exceeding the junction temperature, T
J
.
2
Zener diodes are built-in between the PWM pin and GND, and between the REF pin and GND. V is the breakdown voltage of these internal Zener
Z
diodes, and V
Z
= 6.3 V (typ). In addition, the maximum sink current is 1 mA.
3
Allowable loss, P , is dependent on the circuit layout of the PCB to be used.
D
4
Please refer to the Ambient Temperature versus Power Dissipation Curve.
2.0
Ambient Temperature versus Power Dissipation
P
D
= 1.73 W
On Sanken evaluation PCB
R
Maximum Allowable
Power Dissipation, P
D
(W)
1.5
DIP
θ
J
-A
=
72
1.0
°C
/
W
0.5
0
0
25
50
75
100
125
150
Ambient Temperature, TA (°C)
LC5223D/26D-DS
SANKEN ELECTRIC CO., LTD.
2
August 8, 2012
LC5223D and
LC5226D
Off-Line DC / DC LED Driver ICs
Recommended Operating Conditions
Characteristic
Symbol
LC5223D
Power Supply Voltage
V
BB
LC5226D
Average Output Current
REF Pin Input Voltage
Case Temperature
I
O(AVG)
V
REF
T
C
Normal operation
Measured at the center of the branded side,
T
J
≤
150°C.
Test Conditions
Minimum input voltage depends
on LED output voltage and
converter topology.
Pins*
6–8
(7 – 8)
5–4
(5, 6 – 4)
3–8
–
Min.
25
25
―
0.2
―
Max.
200
400
0.8
2.5
105
Unit
V
V
A
V
°C
Note: Recommended Operating Conditions means the operation conditions to maintain normal functions shown in the Electrical Characteristics table.
*Where the pin numbers differ between the DIP8 and the SOP8 packages, the SOP8 pin number is written in parentheses.
LC5223D/26D-DS
SANKEN ELECTRIC CO., LTD.
3
August 8, 2012
LC5223D and
LC5226D
Off-Line DC / DC LED Driver ICs
Electrical Characteristics
Unless specifically noted, T
A
is 25°C, V
BB
= 140 V
Characteristic
Power Supply Current
Output MOSFET Breakdown Voltage
Output MOSFET On-Resistance
Body Diode Forward Voltage
UVLO Threshold (Turn on)
UVLO Threshold (Turn off)
REG Pin Output Voltage
REG Pin Output Current
Enable Output Threshold Voltage
Sleep Mode Threshold Voltage
REF Pin Current
Current Control Detection
Voltage
1
Symbol
I
BBS
I
BB
V
(BR)DSS
R
DS(ON)
V
f
V
UVLO(ON)
V
UVLO(OFF)
V
REG
I
REG
V
ENB
V
SLP
I
REF
V
SEN
V
REF
= 0.2 to 2.0 V
V
REF
= 2.0 to 3.0 V
OCP Detection
Voltage
1
V
OCP
I
SEN
V
PWM(L)
V
PWM(H)
I
PWM
t
BLK(P)
t
BLK(O)
f
PWM
t
off
t
r
t
f
T
TSD
T
TSD(HYS)
Duty cycle = 50%
C
PWM
= 100 pF
I
O
= 0.4 A
I
O
= 0.4 A
V
REF
= 0.2 to 2.0 V
V
REF
= 2.0 to 3.0 V
SEN Pin Current
PWM Pin Low Voltage
PWM Pin High Voltage
PWM Pin Output Current
PWM Blanking Time
OCP Blanking Time
PWM Operation Frequency
PWM Off Time
Output MOSFET Rise Time
Output MOSFET Fall Time
Thermal Shutdown Threshold
2
Thermal Shutdown Hysteresis
2
1
The
2
Chip
Test Conditions
Output off
Normal operation
LC5223D
LC5226D
LC5223D
LC5226D
LC5223D
LC5226D
I
D
= 1 mA
I
D
= 1.0 A
I
D
= 1.0 A
I
f
= 1.0 A
I
f
= 1.0 A
Pins
6–8
6–8
5–4
5–4
4
−
5
6–8
6–8
1
−
8
1
−
8
3
−
8
3
−
8
3
−
8
4
−
8
Min.
―
―
250
450
―
―
―
―
―
―
9.6
−2
―
2.85
−10
0.4 × V
REF
−
0.03
0.77
Typ.
1
2.5
―
―
0.7
1.7
0.75
0.88
14
12
10
―
0.15
3.0
―
0.4 × V
REF
0.8
0.4 × V
REF
+ 0.7
1.5
―
2
3
−20
0.3
0.2
―
17
25
50
150
55
Max.
1.5
4.0
―
―
1.3
3
1.2
1.0
―
―
10.4
―
0.19
―
10
0.4 × V
REF
+ 0.03
0.83
―
―
10
―
―
―
―
―
200
―
―
―
―
―
Unit
mA
mA
V
V
Ω
Ω
V
V
V
V
V
mA
V
V
μA
V
V
V
V
μA
V
V
μA
μs
μs
kHz
μs
ns
ns
°C
°C
VBB pin voltage
VBB pin voltage
I
REG
= 0 mA
V
REG
= 9 V
REF pin voltage
REF pin voltage
4
−
8
4
−
8
2
−
8
2
−
8
2
−
8
―
―
2
−
8
―
5–4
5–4
―
―
―
―
−10
―
―
―
―
―
―
―
―
―
―
―
REF pin has different functions, depending on the voltage. Please refer to REF Pin Voltage Characteristics section.
temperature of control IC, T
J
.
LC5223D/26D-DS
SANKEN ELECTRIC CO., LTD.
4
August 8, 2012
LC5223D and
LC5226D
Off-Line DC / DC LED Driver ICs
REF Pin Voltage Characteristics
Internal Reference Voltage (V)
OCP_
REF
R
+V
OC
CR
O
_ S
0.8
=
V
OCR
V
C
V
OCR_OS
CC_
REF
×
V
Ref
R
=
V
CC
0
0
0.15
1.0
0.4
2.0
3.0
Latch
(Sleep)
REF Pin Input VoltageV
REF
(V)
On
(Enable)
Out
Off (Disable)
Function
Internal PWM reference
voltage, V
CCR
OCP reference voltage, V
OCR
Enable function
Sleep function
Conditions
• When V
REF
< 2 V, V
CCR
= 0.4 × V
REF
(V) (V
CCR
is proportional to V
REF
)
• When V
REF
> 2 V, V
CCR
= 0.8 V
V
OCR
is offset from V
CCR
by V
OCP_OS
; V
OCR_OS
= 0.7 V (typ); V
OCR
has
negative temperature characteristics
Enable mode is entered when V
REF
> V
ENB
; Enable mode is not latched, and
the IC stops operating when V
REF
falls below V
ENB
; V
ENB
= 0.15 V (typ)
Sleep mode is entered when V
REF
> V
SLP
, turning off the output;
V
ENB
= 3.0 V (typ); Sleep mode is latched, and the latch is released when V
BB
falls below V
UVLO(OFF)
; V
UVLO(OFF)
= 12 V (typ)
LC5223D/26D-DS
SANKEN ELECTRIC CO., LTD.
5
August 8, 2012
Embedded System
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