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Shen Zhen Strong Link Electronics
LY9523/LY9525/LY9526/LY9527/LY9528
Current mode PWM controller with integrated high
voltage power MOSFET
LY9523/LY9525/LY9526/LY9527/LY9528
GENERAL DESCRIPTION
LY 9 5 2 3 / LY 9 5 2 5 / LY 9 5 2 6 / LY 9 5 2 7 / LY 9 5 2 8
combines a dedicated current mode PWM
controller with integr ated hig h voltag e po wer
MOSFET.
Vcc low startup current and low operating
current contribute to a reliable power on startup
DIP8-300-2.54
design with LY9523/LY9525/LY9526/LY9527/LY9528. the IC operates in Extended
‘burst mod e’ to minimize switching loss. Low
er standb y po we r and hi gh er
conve rsion efficiency is thus achieved.
LY952 3/L Y 952 5/LY95 26/LY95 27 /LY9528 o perat es in the fixed P WM freque ncy ,the
frequ ency is 65KHz.
Excellent EMI perfor mance is achieve d wi th prop riet ary fre qu e ncy hufflin g echniqu e.
Soft Start with 4mS,LY9523/LY9525/LY9526/LY9527/LY9528 offers complete
protection coverage with automatic self-recovery feature including Vcc over voltage
clamp and under voltage lockout (UVLO), over voltage protection(OLP),over current
protection (OCP).L Y9 523/L Y9 52 5/L Y952 6/ LY952 7/L Y 952 8 is offered i n DIP-8
package.
F E AT U R E S
z Integrate d high volta ge po wer MOSFET
z Low Vcc Startup Current(5μA)
z “No Y-CAP”system design in sub 20W range
z Frequency shuffling for EMI
z Over current Protection(OCP),over voltage Protection(OVP)
z UVLO and Auto Self- Recovery
z Soft Start with 4mS
z Burst Mode
z Cycle-by-Cycle Over-current limiting
z OTP
Maike Electronic (HK) Co,.Ltd.
LY-DOC952X REV:2.1 Feb..2011
www.maike-tech.com
1/7
http://www.Datasheet4U.com

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Shen
Zhen Strong Link Electronics
LY9523/LY9525/LY9526/LY9527/LY9528
A P P L I C AT I O N S
z DVD/DVB/Set-Top Box Power Supplies
z Offline AC/DC Flyback converter
z Battery Charger
z Open-frame SMPS
BLOCK DIAGRAM
Vcc
5V Internal
Bias
UVLO
Vcc
Clamp
R1
FB
Frequency
Jitter
Green
D2 Mode
R2
OLP
R3
OSC
Burst
Mode
Delay
68mS
SQ
___
RQ
OTP
Driver
Q1
D1
Q2
Vcc_G
Drain
Q3
Vth
-
Slope
+ Compensation
LEB
Sense
PWM
+ Compensation
-
OCP
Soft
Start
Gnd
PIN CONNECTION
Maike Electronic (HK) Co,.Ltd.
LY-DOC952X REV:2.1 Feb..2011
www.maike-tech.com
2/7

No Preview Available !

Shen
Zhen Strong Link Electronics
LY9523/LY9525/LY9526/LY9527/LY9528
PIN DESCRIPTIONS
Pin
No.
1
2
3
4
5
67
8
Pin Name
GND
Vcc-G
Vcc
FB
Sense
Drain
Descriptions
Ground
Power Supply specially for Internal Gate Driver
power supply pin
Feedback input pin
Current sense input pin
The Drain pin is designed to connect directly to the
primary lead of the transformer and is capable of
switching a ma ximu m of 650V
OUTPUT POWER TABLE
Name
190V 260V
Adapting
Opening
LY9523
6W
8W
LY9525
10W
14W
LY9526
20W
24W
LY9527
LY9528
22W
24W
28W
30W
85V 26 5V
Adapting
Opening
5W 7W
8W 12W
15W
20W
20W
24W
24W
28W
ABSOLUTE MAXI MUM RATINGS (Ta=25)
Characteristics
Drain Input Voltage
Vcc-G Voltage
LY9523
Vcc zener clamp
continuous
current
LY9525
LY9526
LY9527
LY9528
Power Supply V oltage
VFB Maximum Input Voltage
Symbol
V Drain
V GS
ID
ID
ID
ID
ID
V VCC
Value
650
±20
0.80
1.0
2.0
3.0
4.0
25
-0.3 ~ 7.0
Maike Electronic (HK) Co,.Ltd.
LY-DOC952X REV:2.1 Feb..2011
www.maike-tech.com
Unit
V
V
A
A
A
A
A
V
V
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