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What is LD7531A?

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


LD7531A Datasheet PDF - Leadtrend Technology

Part Number LD7531A
Description Green-Mode PWM Controller
Manufacturers Leadtrend Technology 
Logo Leadtrend Technology Logo 


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LD7531A
7/6/2009
Green-Mode PWM Controller with Frequency Trembling
and Integrated Protections
REV: 00
General Description
The LD7531A is built-in with several functions, protection
and EMI-improved solution in a SOT-26/ DIP-8 package.
It takes less components counts or circuit space,
especially ideal for those total solutions of low cost.
The implemented functions include low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. And the LD7531A features more
protections like OLP (Over Load Protection) and OVP
(Over Voltage Protection) to prevent the circuit damage
from the abnormal conditions.
Furthermore, the frequency trembling function is to reduce
the noise level and thus helps the power circuit designers
to easily deal with the EMI filter design by using minimum
component cost and developing time.
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<20μA)
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 Programmable Switching Frequency
z Internal Trembling (±4KHz)
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z OLP (Over Load Protection)
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
Typical Application
AC EMI
input Filter
VCC
RT
100K Ohm
COMP
32V
16.0V
/10.0V
UVLO
LD7531A
FM OSC
Divider
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7531A-DS-00 July 2009
1
www.leadtrend.com.tw
photocoupler
TL431

line_dark_gray
LD7531A equivalent
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
Supply Voltage (Vcc Pin)
Startup Current
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V
Protection tripped (OLP)
Protection tripped (OVP)
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
Current Sensing (CS Pin)
Maximum Input Voltage, VCS_Off
Leading Edge Blanking Time
Input impedance
Delay to Output
VCOMP>1.9V
VCOMP<1.8V
Oscillator for Switching Frequency
Frequency
Green Mode Frequency
Trembling Frequency
Temp. Stability
Voltage Stability
RT=100KΩ
Fs=65kHz
(-40°C ~105°C)
(VCC=11V-25V)
Gate Drive Output (OUT Pin)
Output Low Level
Output High Level
Rising Time
Falling Time
VCC=15V, Io=20mA
VCC=15V, Io=20mA
Load Capacitance=1000pF
Load Capacitance=1000pF
OLP (Over Load Protection)
OLP Trip Level
OLP Delay Time at start-up
VCOMP (OLP)
Fs=65kHz
OLP Delay Time
Fs=65kHz
* RT value is in proportion to OLP delay time.
Leadtrend Technology Corporation
LD7531A-DS-00 July 2009
5
www.leadtrend.com.tw
LD7531A
MIN TYP MAX UNITS
12 20
2.65 3.5
3.0
0.45
0.55
9.0 10.0 11.0
15.0 16.0 17.0
26.8 28.0 29.2
μA
mA
mA
mA
mA
V
V
V
1.3 2.2
5.9
2.85
0.8 0.85 0.9
240
1400
1
100
mA
V
V
V
ns
ns
MΩ
ns
60 65 70
21
± 4.0
5
1
kHz
kHz
kHz
%
%
1V
8V
170 350
ns
50 100 ns
5.0 V
70 ms
40 ms


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Featured Datasheets

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LD7531The function is Green-Mode PWM Controller. Leadtrend TechnologyLeadtrend Technology
LD7531AThe function is Green-Mode PWM Controller. Leadtrend TechnologyLeadtrend Technology

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