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PDF LD7532 Data sheet ( Hoja de datos )
| Número de pieza | LD7532 | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend Technology | |
| Logotipo |  |
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LD7532
6/16/2008
Green-Mode PWM Controller with Latch off Protections
REV: 00
General Description
LD7532 is specifically designed for a low cost system by
integrating in a SOT-26 package many functions,
protections, and EMI-improved solution which usually need
a lot of extra components or circuits on a system design.
Furthermore, CT pin latch-off function triggered by a high
voltage above 3.1V provides power circuit designers to
easily deal with protection schemes, such as OVP and OTP,
and to minimize component cost and developing time.
In order to satisfy different designs, the OVP trig level is
adjustable by user 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
Leadtrend Technology Corporation
LD7532-DS-00 June 2008
1
www.leadtrend.com.tw
1 page  
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 mode
UVLO (off)
UVLO (on)
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
VCOMP=0V
COMP pin open
OLP Current
COMP pin open
Green Mode Threshold VCOMP
Burst Mode Threshold VCOMP
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
Temp. Stability
Voltage Stability
(-40°C ~105°C)
(VCC=11V-25V)
FM Oscillator (CT pin)
Timer Frequency
OVP trigger level (Latch)
CT=0.047μF
Holding Current
Vcc=7V(latched),
Gate Drive Output (OUT Pin)
Output Low Level
VCC=15V, Io=20mA
Output High Level
VCC=15V, Io=20mA
Rising Time
Load Capacitance=1000pF
Falling Time
Load Capacitance=1000pF
Max. Duty
Load Capacitance=1000pF
OLP (Over Load Protection)
OLP Trip Level
Vcomp(OLP)
OLP Delay time
CT=0.047μF
LD7532
MIN
TYP
MAX UNITS
12 20 μA
2.5 mA
3.0 mA
0.45
mA
9.0
10.0
11.0
V
15.0
16.0
17.0
V
1.5
6.0
0.45
2.35
1.4
mA
V
mA
V
V
0.80
0.85
0.90
V
220 nS
1 MΩ
100 nS
60 65 70 KHz
20 KHz
5%
1%
220 Hz
2.9 3.1 3.3 V
250 uA
1.0 V
8V
180 360 nS
50 100 nS
75 %
5.0 V
45 mS
Leadtrend Technology Corporation
LD7532-DS-00 June 2008
5
www.leadtrend.com.tw
5 Page 
VCC
UVLO(on)
UVLO(off)
COMP
5.0V
OUT
OLP
UVLO(off)
OLP Reset
OLP delay time
OLP trip Level
t
t
Switching
Non-Switching
Fig. 19
Switching
t
LD7532
Leadtrend Technology Corporation
LD7532-DS-00 June 2008
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LD7532.PDF ] | |
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