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PDF LD7550 Data sheet ( Hoja de datos )
| Número de pieza | LD7550 | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7550 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Green-Mode PWM Controller
LD7550
8/27/2004
General Description
The LD7550 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 SOT-26 package provide the users a high efficiency,
low external component counts, and low cost solution for
AC/DC power applications.
The special green-mode control is not only to achieve the
low power consumption but also to offer a non-audible-noise
operation when the LD7550 is operating under light load or
no load condition.
The LD7550 is designed for the low power adaptor or
charger applications. The LD7550 is with both SOT-26 and
DIP-8 package.
Patent pending
Features
High-Voltage CMOS Process with Excellent ESD
protection
Very Low Startup Current (Typical 5µA)
Under Voltage Lockout (UVLO)
Current Mode Control with Cycle-by-Cycle Peak
Current Limiting
Leading-Edge Blanking on CS Pin
Programmable Switching frequency
Internal Slope Compensation
Proprietary Green-Mode Control for Power Saving1
Non-audible-noise Green Mode Control
300mA Driving Capability
Applications
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
384X Replacement
1 Note: Please see Application Information
Typical Application
AC
input
EMI
Filter
RT
COMP
VCC
40V
16.0V/
11.4V
UVLO
LD7550
OSC
Divider
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7550-DS-00 July 2004
1
photocoupler
TL431
1 page  
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
LD7550
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
Fig. 4
0 20 40 60 80 100 120
Temperature (°C)
Green-Mode Frequency vs. Temperature
Leadtrend Technology Corporation
LD7550-DS-00 August 2004
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LD7550.PDF ] | |
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