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PDF LD7550-B Data sheet ( Hoja de datos )
| Número de pieza | LD7550-B | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7550-B
12/22/2006
REV: 01a
Green-Mode PWM Controller
General Description
The LD7550-B 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.
Compared with LD7550, LD7550-B has different parameters
or functions on the following characteristics ---
z Enlarger the hysteresis range of UVLO by lower down
the UVLO(off) from 11.4V to 10V.
z Add OVP (Over Voltage Protection) function on Vcc
Pin.
z Shorten the OCP delay time to 100nS to reduce the
difference of OCP trip level under high line & low line.
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<20µA)
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 Saving
z Non-audible-noise Green Mode Control
z 300mA Driving Capability
z OVP (Over Voltage Protection) on Vcc Pin
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
RT
COMP
16.0V/
10.0V
UVLO
LD7550-B
OSC
Divider
Control
Logic
GND
OUT
CS
Leadtrend Technology Corporation
LD7550-B-DS-01a May 2007
1
photocoupler
TL431
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1 page  
LD7550-B
Typical Performance Characteristics
12
10
8
6
4
2
0
-40 0
50 100
Temperature (°C)
150
Fig. 1 Startup Current (Istartup) vs. Temperature
18
5.6
5.4
5.2
5.0
4.8
4.6
-40
0 50 100
Temperature (°C)
150
Fig. 2 VCOMP open loop voltage v.s. Temperature
12
17 11
16 10
15 9
14
-40
70
68
66
64
62
60
-40
0 50 100
Temperature (°C)
Fig. 3 UVLO (On) vs. Temperature
0
Fig. 5
50 100
Temperature (°C)
Frequency v.s. Temperature
Leadtrend Technology Corporation
LD7550-B-DS-01a May 2007
8
150
-40 0
50 100 150
Temperature (°C)
Fig. 4 UVLO Off v.s. Temperature
25
23
21
19
17
150
5
15 -40
0
50 100 150
Temperature (°C)
Fig. 6 Green Mode Frequency v.s. Temperature
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5 Page 
LD7550-B
Reference Application Circuit --- 10W (5V/2A) Adapter
BOM
P/N
R1A
R1B
R2A
R2B
R4A
R4B
R6
R7
RS1
RS2
RT
R51A
R51B
R52
R53
R54
R55
R56A
R56B
NTC1
FL1
T1
L51
Component Value
N/A
N/A
750KΩ, 1206
750KΩ, 1206
39KΩ, 1206
39KΩ, 1206
10Ω, 1206
10Ω, 1206
2.74Ω, 1206, 1%
2.74Ω, 1206, 1%
100KΩ, 0805, 1%
100Ω, 1206
100Ω, 1206
2.49KΩ, 0805, 1%
2.49KΩ, 0805, 1%
220Ω, 0805
10KΩ, 0805
510Ω, 1206
N/A
08SP005
20mH
EI-22
2.7µH
Original
UU9.8
P/N
C1
C2
C4
C5
C51
C52
C54
C55
CX1
CY1
D1A
D1B
D1C
D1D
D2
D4
Q1
CR51
ZD51
IC1
IC2
IC51
F1
Z1
Component Value
22µF, 400V
10µF, 50V
1000pF, 1000V, 1206
0.01µF, 16V, 0805
1000pF, 50V, 0805
1000µF, 10V
470µF, 10V
0.01µF, 16V, 0805
0.1µF
2200pF
1N4007
1N4007
1N4007
1N4007
PS102R
1N4007
2N60B
SB540
6V2C
LD7550-BBL
EL817B
TL431
250V, 1A
N/A
Note
L-tec
Holystone
L-tec
L-tec
X-cap
Y-cap
600V/2A
SOT-26
1%
Leadtrend Technology Corporation
LD7550-B-DS-01a May 2007
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LD7550-B.PDF ] | |
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