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What is LD7577GS?

This electronic component, produced by the manufacturer "Leadtrend", performs the same function as "High Voltage Green-Mode PWM Controller".


LD7577GS Datasheet PDF - Leadtrend

Part Number LD7577GS
Description High Voltage Green-Mode PWM Controller
Manufacturers Leadtrend 
Logo Leadtrend Logo 


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LD7577
1/15/2009
High Voltage Green-Mode PWM Controller with
Brown-Out Protection
Rev. 01
General Description
The LD7577 integrates several functions of protections, and
EMI-improved solution in SOP-8 package. It minimizes the
component counts and the circuit space.
The device provides functions of low startup current,
green-mode power-saving operation, leading-edge blanking
of the current sensing and internal slope compensation.
Also, it features more protections like OLP (Over Load
Protection), OVP (Over Voltage Protection), and brownout
protection to prevent the circuit from being damaged under
abnormal conditions.
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 Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z AC Input OVP (Over Voltage Protection)
z OLP (Over Load Protection)
z Precision 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 EMI
input Filter
*
HV VCC OUT
BNO
LD7577
CS
GND COMP
*
*See Application Information
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
1
www.leadtrend.com.tw
photocoupler
TL431

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LD7577GS equivalent
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
High-Voltage Supply (HV Pin)
High-Voltage Current Source
Vcc< UVLO(on), HV=500V
Off-State Leakage Current
Vcc> UVLO(off), HV=500V
Supply Voltage (Vcc Pin)
Startup Current
Vcc< UVLO(on)
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V
OLP tripped
OVP tripped
UVLO (off)
UVLO (on)
OVP Level
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
VCOMP=0V
COMP pin open
Green Mode Threshold VCOMP
Burst Mode Threshold VCOMP
Current Sensing (CS Pin)
Maximum Input Voltage
Leading Edge Blanking Time
Input impedance
VCOMP>1.9V
Delay to Output
Oscillator for Switching Frequency
Frequency
Green Mode Frequency
Temp. Stability
(-40°C ~105°C)
Voltage Stability
(VCC=11V-25V)
LD7577
MIN
TYP
MAX UNITS
0.5 1.0 1.5 mA
8.9 35 μA
320 μA
2.85
mA
3.2 mA
0.68
mA
0.78
mA
9.0
10.0
11.0
V
15.0
16.0
17.0
V
26.5
28.0
29.5
V
1.5
6.0
2.35
1.4
2.2 mA
V
V
V
0.80
0.85
0.90
V
250 nS
1 MΩ
100 nS
60 65 70 KHz
22 KHz
5%
1%
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
5
www.leadtrend.com.tw


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LD7577GS electronic component.


Information Total 18 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
LD7577GNThe function is High Voltage Green-Mode PWM Controller. LeadtrendLeadtrend
LD7577GSThe function is High Voltage Green-Mode PWM Controller. LeadtrendLeadtrend

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