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PDF LD7552B Data sheet ( Hoja de datos )
| Número de pieza | LD7552B | |
| Descripción | Green Mode PWM Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7552B
1/2/2008
Green-Mode PWM Controller with Integrated Protections
Rev. 01a
General Description
The LD7552B are low cost, low startup current, current
mode PWM controllers with green-mode power- saving
operation. The integrated functions include the
leading-edge blanking of the current sensing, internal slope
compensation. They provide the users a superior AC/DC
power application of higher efficiency, low external
component counts, and lower cost solution.
Furthermore, LD7552B feature more protections like OLP
(Over Load Protection) and OVP (Over Voltage Protection)
to eliminate the external protection circuits. It is designed for
the switching adaptor with 30W~60W output, offered in both
SOP-8 and DIP-8 package.
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 Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z OLP (Over Load Protection)
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
Typical Application
AC
input
EMI
Filter
VCC
32V
16.0V
/10.0V
LD7552B
RT
OSC
COMP
Divider
UVLO
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7552B-DS-01a January 2008
1
photocoupler
TL431
1 page  
www.DataSheet4U.com
LD7552B
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, 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
Oscillator (RT pin)
Frequency
RT=100KΩ
Green Mode Frequency
Fs=65KHz
Temp. Stability
(-40°C ~105°C)
Voltage Stability
(VCC=11V-25V)
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
OLP (Over Load Protection)
OLP Trip Level
OLP Delay Time (note)
VCOMP(OLP)
Fs=65KHz
MIN
TYP
MAX UNITS
8 20 μA
2.0 3.0 mA
2.5 mA
0.5 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
2.2 mA
V
V
0.80
0.85
0.90
V
350 nS
1 MΩ
100 nS
60 65 70 KHz
20 KHz
5%
1%
1V
9V
50 160 nS
30 60 nS
5.0 V
60 mS
Note: The OLP delay time is proportional to the period of switching cycle. So that, the lower RT value will set the higher switching
frequency and the shorter OLP delay time.
Leadtrend Technology Corporation
LD7552B-DS-01a January 2008
5
5 Page 
www.DataSheet4U.com
VCC
UVLO(on)
UVLO(off)
COMP
5.0V
OLP
UVLO(off)
OLP Reset
60mS
OLP trip Level
OUT
t
t
Switching
Non-Switching
Switching
t
Fig. 19
Fault Protection
There are several critical protections were integrated in the
LD7552B to prevent the power supply or adapter from being
damaged. Those damages usually come from open or short
condition on the pins of LD7552B. Under the conditions
listed below, the gate output will turn off immediately to
protect the power circuit ---
y RT pin short to ground
y RT pin floating
y CS pin floating
LD7552B
Leadtrend Technology Corporation
LD7552B-DS-01a January 2008
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LD7552B.PDF ] | |
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