2013/08/14
Rev.A.1 1
EM8559A
HV Start-up Green-mode PWM Convertor with Brown-Out Protection
General Description
EM8559A is a high performance, low cost, HV
Start-up, current mode PWM controller with green
mode power saving. The EM8559A integrates
functions of Soft Start (SS), Under Voltage Lockout
(UVLO), Leading Edge Blanking (LEB), internal Over
Temperature Protection (OTP), and internal slope
compensation. The EM8559A also features more
protection like Over Load Protection (OLP) and
Over Voltage Protection (OVP) to prevent circuit
damage occurred under abnormal conditions. The
EM8559A also has line under-voltage protection
(Brown-out Protection).
Ordering Information
Part Number
Package
Remark
EM8559AS7 DIP-7
Features
600V High Voltage Start up Circuit
Current Mode Control
Soft Start Function
Built-in Slope Compensation
Internal Leading-edge Blanking
Brown in/out Protection
Over Voltage Protection (OVP) on VCC pin
Over Load Protection (OLP)
Cycle-by-cycle Current Limit
Feedback Open Protection
Internal Over Temperature Protection (OTP)
Constant Output Power Limit (Full AC Input
Range)
Excellent EMI performance
Applications
LCD Monitor Power Supply
Open-Frame SMPS
Typical Application Circuit 1
AC
INPUT
EMI
Filter
EM8559A
D VCC
COMP
D
Typical application
DC
OUT
PUT
GND
BNO
CS
2013/08/14
Rev.A.1 2
EM8559A
Typical Application Circuit 2
Pin Configuration
Pin Assignment
Pin Name Pin Number
Pin Function
CS 1
Senses the primary current.
BNO 2
Line voltage detection. Use for brown-out protection.
GND 3
Ground.
COMP 4
Voltage feedback pin
.
By connecting a photo
-
coupler to close the control
loop
and achieve the regulation.
VCC 5
IC Power Supply Pin.
D 6,7
For start-up, the pin is also HV Power MOSFET drain Pin.
DIP
-
7
TOP VIEW
D
D
GND
COMP
BNO
CS
VCC
1
2
3
4
5
6
7
AC
INPUT
EMI
Filter
EM8559A
D
VCC
COMP
D
Brown
-
out
application
DC
OUTPUT
GND
BNO
CS