TOP244PN 查看數據表（PDF） - Power Integrations, Inc
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TOP244PN
Power Integrations, Inc
TOP244PN Datasheet PDF : 52 Pages
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TOP242-250
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
External Current
Limit
N/A*
Programmable 100%
to 30% of default
current limit
11,20,21, • Smaller transformer
24,25,27, • Higher efficiency
28,34,35, • Allows power limiting (constant
38,39
overload power independent of
line voltage)
• Allows use of larger device for
lower losses, higher efficiency
and smaller heatsink
DCMAX
67%
78%
7
• Smaller input cap (wider dynamic
range)
• Higher power capability (when
used with RCD clamp for large
VOR)
• Allows use of Schottky secondary
rectifier diode for up to 15 V
output for high efficiency
Line Feed-Forward N/A*
with DC MAX Reduction
78% to 38%
7,11,17, • Rejects line ripple
26,27,28,
31,40
Line OV Shutdown N/A*
Single resistor
programmable
11,17,19, • Increases voltage withstand
26,27,28 capability against line surge
31,33,40
Line UV Detection N/A*
Single resistor
programmable
11,17,18, • Prevents auto-restart glitches
26,27,28, during power down
31,32,40
Switching Frequency 100 kHz ±10%
132 kHz ±6%
13,15
• Smaller transformer
• Below start of conducted EMI
limits
Table 4. Comparison Between TOPSwitch-II and TOPSwitch-GX (continued on next page). *Not available
26 M
12/04
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