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PDF LD7552D Data sheet ( Hoja de datos )
| Número de pieza | LD7552D | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend Technology | |
| Logotipo |  |
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LD7552D
12/19/2007
Green-Mode PWM Controller with Integrated Protections and
Adjustable OLP Delay Time
REV: 00
General Description
The LD7552D are specifically designed for the low total
system cost by integrating many functions, protections, and
the EMI-improved solution in a SOP-8 package which
usually need a lot of extra components or circuits on the
general designs.
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 LD7552D features more protections like OLP (Over
Load Protection) and OVP (Over Voltage Protection) to
prevent the circuit damage from the abnormal conditions.
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 Adjustable OLP Delay Time.
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
Typical Application
Leadtrend Technology Corporation
LD7552D-DS-00 December 2007
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 (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 for Switching Frequency
Frequency
Internal Fixed
Green Mode Frequency
Trembling Frequency
Temp. Stability
(-40°C ~105°C)
Voltage Stability
(VCC=11V-25V)
Low Frequency Timer (CT pin)
Low Frequency Period
CT=0.047μF
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
VCOMP(OLP)
CT=0.047μF
CT value is in proportion to OLP delay time.
LD7552D
MIN
TYP
MAX UNITS
12 20 μA
2.5 mA
3.0 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
1.5
6.0
2.35
mA
V
V
0.80
0.85
0.90
V
240 nS
1 MΩ
60 nS
60 65 70 KHz
20 KHz
±4 KHz
5%
1%
4.7 mS
1V
8V
50 160 nS
30 60 nS
5.0 V
40 mS
Leadtrend Technology Corporation
LD7552D-DS-00 December 2007
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
LD7552D
Leadtrend Technology Corporation
LD7552D-DS-00 December 2007
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LD7552D.PDF ] | |
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