參數(shù)資料
型號： T0P243G
廠商： Power Integrations, Inc.
英文描述： Family Extended Power, Design Flexible,Integrated Off-line Switcher
中文描述： 家庭擴展的電源，設(shè)計靈活，集成的離線切換
文件頁數(shù)： 27/48頁
文件大?。?/td> 771K
代理商： T0P243G
TOP242-249
27
August 8, 2000
E
7/01
Key Application Considerations
TOPSwitch-II
vs.
TOPSwitch-GX
Table 4 compares the features and performance differences
between
TOPSwitch
-
GX
and
TOPSwitch-II
. Many of the new
features eliminate the need for additional discrete components.
Other features increase the robustness of design allowing cost
savings in the transformer and other power components.
Function
TOPSwitch-II
TOPSwitch-GX
Figures
TOPSwitch-GX
Advantages
Soft-Start
N/A*
10 ms
Limits peak current and voltage
component stresses during start-up
Eliminates external components
used for soft-start in most
applications
Reduces or eliminates output
overshoot
Smaller transformer
Higher efficiency
Allows power limiting (constant over-
load power independent of line
voltage
Allows use of larger device for lower
losses, higher efficiency and smaller
heatsink
Smaller input cap (wider dynamic
range)
Higher power capability (when used
with RCD clamp for large V
)
Allows use of Schottky secondary
rectifier diode for up to 15 V output
for high efficiency
Rejects line ripple
External Current Limit
N/A*
Programmable
100% to 30% of
default current
limit
11,20,21,
24,25,27,
28,34,35,
38,39
DC
MAX
67%
78%
7
Line Feed Forward with N/A*
DC
MAX
Reduction
78% to 38%
7,11,17,
26,27,28,
31,40
11,17,19,
26,27,28,
31,33,40
11,17,18,
26,27,28,
31,32,40
13,15
Line OV Shutdown
N/A*
Single resistor
programmable
Increases voltage withstand cap-
ability against line surge
Line UV Detection
N/A*
Single resistor
programmable
Prevents auto-restart glitches
during power down
Switching Frequency
100 kHz
±
10%
132 kHz
±
6%
Smaller transformer
Below start of conducted EMI limits
Lower losses when using RC and
RCD snubber for noise reduction in
video applications
Allows for higher efficiency in
standby mode
Lower EMI (second harmonic below
150 kHz)
Reduces conducted EMI
Switching Frequency
Option (Y and R
Packages)
N/A*
66 kHz
±
7%
14,15
Frequency Jitter
N/A*
±
4 kHz@132 kHz 9,46
±
2 kHz@66 kHz
At a Duty Cycle
below 10%
Frequency Reduction
N/A*
7
Zero load regulation without dummy
load
Low power consumption at no load
Table 4. Comparison Between TOPSwitch-II and TOPSwitch-GX. (continued on next page)
*Not available
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