lc5521d Allegro MicroSystems, Inc., lc5521d Datasheet - Page 3

• Manufacturer Part Number: lc5521d
• Description: Single-stage Power Factor Corrected Off-line Switching Regulator Ic
• Manufacturer: Allegro MicroSystems, Inc.

LC5521D
S/GND
OCP
VCC
Pin-out Diagram
FB
1
2
3
4
8
6
5
D/ST
OVP
NF
OCP
OVP
6
3
LC5521D Terminal List Table
Number
Reg
1
2
3
4
5
6
7
8
Detection
VCC
OVP
OCP
Bottom
2
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Functional Block Diagram
Functional Block Diagram
Functional Block Diagram
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
S/GND
Name
D/ST
LEB
VCC
OCP
OVP
NF
FB
–
Thermal
Shutdown
MOSFET source and GND terminal for the Controller chip
Supply voltage input
Overcurrent protection and quasi-resonant signal input terminal
Feedback signal input and Overload protection (OLP) signal input
No function; must be externally connected to S/GND pin with as short
a trace as possible, for stable operation of the device
Overvoltage protection (OVP) signal input
Pin removed
MOSFET drain terminal and input of the startup current
OSC
UVLO
Single-Stage Power Factor Corrected
Bias
Reg
Feedback
Control
Off-Line Switching Regulator IC
S
R
Q
Startup
OLP
Controller Chip
Function
Drv
8
1
4
D/ST
S/GND
FB
3