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PDF LD7552 Data sheet ( Hoja de datos )
| Número de pieza | LD7552 | |
| Descripción | Green Mode PWM Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7552 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Green-Mode PWM Controller
LD7552
2/21/2005
General Description
The LD7552 is a low cost, low startup current, current mode
PWM controller with green-mode power-saving operation.
The integrated functions such as the leading-edge blanking
of the current sensing, internal slope compensation and the
small package provide the users a high efficiency, minimum
external component counts, and low cost solution for AC/DC
power applications.
The special green-mode control does not only achieve low
power consumption but also offer a non-audible-noise
operation when the LD7552 operates under light load or no
load condition.
The LD7552 is designed for the switching adaptor with
30W~60W output. The LD7552 is offered in both SOP-8 and
DIP-8 package.
Patent pending
Features
z High-Voltage CMOS Process with Excellent ESD
Protection
z Very Low Startup Current (Typical 5µA)
z Under Voltage Lockout (UVLO)
z Current Mode Control with Cycle-by-Cycle Peak
Current Limiting
z Leading-Edge Blanking on CS Pin
z Programmable Switching Frequency
z Internal Slope Compensation
z Proprietary Green-Mode Control for Power Saving1
z Non-audible-noise Green Mode Control
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
1 Note: Please see Application Information
Typical Application
AC
input
EMI
Filter
RT
COMP
VCC
40V
16.0V/
11.4V
UVLO
LD7552
OSC
Divider
Control
Logic
GND
OUT
CS
www.DataSheet4U.com
Leadtrend Technology Corporation
LD7552-DS-00 February, 2005
1
photocoupler
TL431
1 page  
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Typical Performance Characteristics
12.2
12.0
11.8
11.6
11.4
11.2
11.0
-40
-20 0
20 40 60 80 100
Temperature (°C)
Fig. 1 UVLO (Off) vs. Temperature
120
72.0
71.0
70.0
69.0
68.0
67.0
66.0
-40
-20 0
20 40 60 80 100
Temperature (°C)
Fig. 3 Frequency vs. Temperature
120
75.9
75.6
75.3
75.0
74.7
74.4
-40 -20
0
20 40 60 80 100 120
Temperature (°C)
Fig. 5 Duty-Cycle (max.) vs. Temperature
LD7552
17.0
16.8
16.4
16.0
15.6
15.2
14.8
14.4
14.0
-40
-20 0 20 40 60 80 100
Temperature (°C)
Fig. 2 UVLO (On) vs. Temperature
120
18.2
18.0
17.8
17.6
17.4
17.2
17.0
-40
-20 0
20 40 60 80 100 120
Temperature (°C)
Fig. 4 Green-Mode Frequency vs. Temperature
www.DataSheet4U.com
Leadtrend Technology Corporation
LD7552-DS-00 February, 2005
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LD7552.PDF ] | |
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