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PDF LD7531 Data sheet ( Hoja de datos )

Número de pieza LD7531
Descripción Green-Mode PWM Controller
Fabricantes Leadtrend Technology 
Logotipo Leadtrend Technology Logotipo



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No Preview Available ! LD7531 Hoja de datos, Descripción, Manual

LD7531
6/25/2008
Green-Mode PWM Controller with Frequency Trembling
and Integrated Protections
REV: 00
General Description
The LD7531 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 LD7531 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
LD7531
FM OSC
Divider
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7531-DS-00 June 2008
1
www.leadtrend.com.tw
photocoupler
TL431

1 page




LD7531 pdf
LD7531
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
Green Mode Threshold VCOMP
VCOMP=0V
COMP pin open
Current Sensing (CS Pin)
Maximum Input Voltage, Vcs(off)
Leading Edge Blanking Time
Input impedance
Delay to Output
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
Vcomp (OLP)
Fs=65kHz
* RT value is in proportion to OLP delay time.
MIN
TYP
MAX UNITS
12 20 μA
2.8 3.5 mA
3.0 mA
0.45
mA
0.5 mA
9.0
10.0
11.0
V
15.0
16.0
17.0
V
26.8
28.0
29.2
V
1.3
5.9
2.35
2.2 mA
V
V
0.80
0.85
0.90
V
190 nS
1 MΩ
100 nS
60 65 70 KHz
21 KHz
± 4.0
KHz
5%
1%
1V
8V
170 350 nS
50 100 nS
5.0 V
50 mS
Leadtrend Technology Corporation
LD7531-DS-00 June 2008
5
www.leadtrend.com.tw

5 Page





LD7531 arduino
LD7531
the false trigger from the power-on and turn-off transient.
Typically the OLP delay time will be around 50mS.
By such protection mechanism, the average input power
can be reduced to very low level so that the component
temperature and stress can be controlled within the safe
operating area.
VCC
UVLO(on)
UVLO(off)
COMP
5.0V
OUT
OLP
UVLO(off)
OLP Reset
OLP delay time
OLP trip Level
t
t
Fault Protection
There are several critical protections were integrated in the
LD7531 to prevent the power supply or adapter had being
damaged. Those damages usually come from open or short
condition on the pins of LD7531.
Under the conditions listed below, the gate output will turn
off immediately to protect the power circuit ---
1. RT pin short to ground
2. RT pin floating
3. CS pin floating
Switching
Non-Switching
Fig. 19
Switching
t
Leadtrend Technology Corporation
LD7531-DS-00 June 2008
11
www.leadtrend.com.tw

11 Page







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