LC5222D Datasheet, PDF (1/11 Pages) Sanken electric – Hybrid Integrated Circuit

LC5222D/25D and LC5222S/25S
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: 0.5A
• 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
Packages
SOP8
DIP8
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
Line
Filt er
AC
Input
Not to scale
Typical Application
V_IN
C_IN
R₁
C₁
R₂ C₂
REG ^VBB
D₁
LC5220
REF
PWM
C_PWM
GND
OUT
SEN
R_S
C₃ V_LED
L₁
An example of a buck voltage converter application circuit
LC5222D/25D_22S/25S-DS
SANKEN ELECTRIC CO., LTD.
August 8, 2012