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LD7577J Datasheet Preview

LD7577J Datasheet

High Voltage Green-Mode PWM Controller

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LD7577J pdf
LD7577J
8/16/2010
High Voltage Green-Mode PWM Controller
with Brown-Out Protection
Rev. 00b
General Description
The LD7577J integrated several functions of protections,
and EMI-improved solution in a tiny package. It minimizes
the component counts and the circuit space, and it’s
perfect for the low cost of applications.
It provides functions of low startup current, green-mode
power-saving operation, leading-edge blanking of the
current sensing and internal slope compensation. Also,
the LD7577J features more protections like OLP (Over
Load Protection), OVP (Over Voltage Protection), and
brownout protection to prevent the circuit being damaged
from the abnormal conditions.
Furthermore, the LD7577J features frequency trembling
to suppress the noise and is an excellent solution for EMI
filter design.
Features
z High-Voltage (500V) Startup Circuit
z Current Mode Control
z Non-Audible-Noise Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Internal Frequency Trembling
z Internal Slope Compensation
z Internal Over Current compensation
z OVP (Over Voltage Protection) on Vcc
z AC Input OVP (Over Voltage Protection)
z OLP (Over Load Protection)
z Brownout Protection
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
AC
input
EMI
Filter
*
BNO
HV VCC OUT
LD7577J
CS
GND COMP
*
*See Application Information
Leadtrend Technology Corporation
LD7577J-DS-00b August 2010
1
www.leadtrend.com.tw
photocoupler
TL431



Leadtrend
Leadtrend

LD7577J Datasheet Preview

LD7577J Datasheet

High Voltage Green-Mode PWM Controller

No Preview Available !

LD7577J pdf
Pin Configuration
SOP-7 (TOP VIEW)
SOP-8 (TOP VIEW)
DIP-8 (TOP VIEW)
LD7577J
7 65
LD7577JGR
YYWWPP
1 23 4
8 7 65
LD7577JGS
YYWWPP
1 234
8 76 5
LD7577JGN
YYWWPP
1 234
YY:
WW:
PP:
Year code
Week code
Production code
Ordering Information
Part number
Switching
Freq.
Package
LD7577J GR
65KHz
SOP-7
Green package
LD7577J GS
65KHz
SOP-8
Green package
LD7577J GN
65KHz
DIP-8
Note: The LD7577J is ROHS compliant.
Green package
Top Mark
LD7577JGR
LD7577JGS
LD7577JGN
Shipping
2500 /tape & reel
2500 /tape & reel
3600 /tube /Carton
Pin Descriptions
PIN NAME
FUNCTION
Brownout Protection Pin. Connect a resistor divider between this pin and bulk
capacitor voltage to set the brownout level. If the voltage is below threshold voltage,
1 BNO
the PWM output will be disabled. The BNO pin also provides AC over voltage
protection. As soon as the voltage is over 4.16V, it will trip OVP and turn off the gate.
Voltage feedback pin. Through the connection of a photo-coupler, it can close the
2 COMP
control loop and achieve the regulation.
3 CS Current sense pin. Connect it to sense the MOSFET current.
4 GND Ground.
5 OUT Gate drive output to drive the external MOSFET.
6 VCC Supply voltage pin.
7 NC Unconnected Pin.
Connect this pin to positive terminal of bulk capacitor to provide the startup current
8 HV for the controller. When VCC voltage trips UVLO(on), this HV loop will be turned off
to save the power loss of the startup circuit.
Leadtrend Technology Corporation
LD7577J-DS-00b August 2010
2
www.leadtrend.com.tw


Part Number LD7577J
Description High Voltage Green-Mode PWM Controller
Maker Leadtrend
Total Page 20 Pages
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