LC5555LD Datasheet, PDF (8/11 Pages) Sanken electric – Single-Stage Power Factor Corrected High Efficiency Non-Isolated Buck LED Driver

LC5550LD
Series
Single-Stage Power Factor Corrected
High Efficiency Non-Isolated Buck LED Driver
Functional Block Diagram
OCP/BD ③
VCC
②
OVP
TSD
UVLO
Control Part
START UP
Reg
Drv
Bias
S
RQ
Bottom
Detection
OSC
OLP OTA
NF ⑤
OCP LEB
Reg
Reg
Feedback
Control
⑧ D/ST
① S/GND
⑥ ISENSE
④ COMP
Pin-out Diagram
Pin List Table
Number Name
1
S/GND
2
VCC
S/GND 1
VCC 2
OCP/BD 3
COMP 4
8 D/ST
3
OCP/BD
6 ISENSE
4
5 NF
5
COMP
NF
6
ISENSE
7
–
8
D/ST
Function
MOSFET source and GND pin for the Control Part
Supply voltage input and Overvoltage Protection (OVP) signal input
Overcurrent Protection (OCP), quasi-resonant signal input, and
Overvoltage Protection (OVP) signal input
Feedback phase-compensation input
No function; must be externally connected to S/GND pin with as short a
trace as possible, for stable operation of the IC
Output current sensing voltage input
Pin removed
MOSFET drain pin and input of the startup current
LC5550LD-DS
SANKEN ELECTRIC CO., LTD.
8
July 9, 2012