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PDF LD7532A Data sheet ( Hoja de datos )
| Número de pieza | LD7532A | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend Technology | |
| Logotipo |  |
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LD7532A
12/17/2008
Green-Mode PWM Controller with Latch off Protections
REV: 00
General Description
The LD7532A is specifically designed for low cost
total-system by integrating many functions, protections,
and EMI-improved solution in a SOT-26 package which
usually need a lot of extra components or circuits on
general system designs.
Furthermore, the CT pin latch function by injecting a high
above 3.1V provides power circuit designers an easy way
to deal with designs for protections, such as OVP and
OTP, minimizing component cost and development time.
In order to satisfy different designs, the OVP trig level is
adjustable by users adding a Zener diode from VCC pin to
CT pin.
Typical Application
Features
z High-Voltage CMOS Process with ESD protection
z Very Low Startup Current (<20μA)
z Current Mode Control
z Non-audible-noise Green Mode Control
z UVLO (Under Voltage Lockout) on VCC Pin
z LEB (Leading-Edge Blanking) on CS Pin
z Programmable OLP Delay Time
z Internal Slope Compensation
z External OVP Latch-off Protection
z OLP (Over Load Protection) Auto-recovery Mode
z External OTP Latch-off Protection
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
AC EMI
input Filter
OUT
NTC
CT
COMP
VCC
32V
16.0V
/9.0V
LD7532A
OSC
Divider
UVLO
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7532A-DS-00 December 2008
1
www.leadtrend.com.tw
photocoupler
TL431
1 page  
LD7532A
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)
UVLO (off)
VCOMP=0V
VCOMP=3V
IOLP, OLP Tripped/ Auto
IOVP, CT pin OVP Tripped/ Latch
UVLO (on)
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
OLP Current
Green Mode Threshold VCOMP
Burst Mode Threshold VCOMP
VCOMP=0V
COMP pin open
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
Trembling Range
Green Mode Frequency
Temp. Stability
Voltage Stability
(-40°C ~105°C)
(VCC=11V-25V)
FM Oscillator (CT pin)
Timer Frequency
OVP trigger level (Latch)
Holding Current
CT=0.047μF
Vcc=7V(latched),
Gate Drive Output (OUT Pin)
Output Low Level
Output High Level
VCC=15V, Io=20mA
VCC=15V, Io=20mA
MIN
9.0
15.0
0.80
1
60
2.9
8
TYP
12
2.5
3.0
0.45
1
10.0
16.0
1.5
6.0
0.45
2.35
1.6
0.85
220
100
65
± 3.5
20.5
5
1
220
3.1
250
MAX UNITS
20 μA
mA
mA
mA
mA
11.0 V
17.0 V
mA
V
mA
V
V
0.90 V
nS
MΩ
nS
70 KHz
KHz
KHz
%
%
Hz
3.3 V
uA
1.0 V
V
Leadtrend Technology Corporation
LD7532A-DS-00 December 2008
5
www.leadtrend.com.tw
5 Page 
LD7532A
when CT=0.1μF and will be around 45mS when
CT=0.047μF.
By such protection mechanism, the average input power
can be reduced to a very low level so that the component
temperature and stress can be controlled within the safe
operating area.
Fig. 18
Over Load Protection (OLP)
To protect circuits from being damaged under over load
condition or short condition, a smart OLP function is
implemented in the LD7532A. The figure 19 shows the
waveforms of the OLP operation. In this case, the
feedback system will force the voltage loop proceeding
toward the saturation and then pull up the voltage on
COMP pin (VCOMP). Whenever the VCOMP trips up to the
OLP threshold 5V and stays longer than the OLP delay
time, the protection will be activated to turn off the gate
output and stop the switching of power circuit. The OLP
delay time, set by CT pin, is to prevent any false trigger
caused by the power-on and turn-off transient. The Higher
the CT value is, the longer the OLP delay time. For
recommendation, the OLP delay time is around 95mS
Fig. 19
Leadtrend Technology Corporation
LD7532A-DS-00 December 2008
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LD7532A.PDF ] | |
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