TOP232G Ver la hoja de datos (PDF) - Power Analog Micoelectronics
Número de pieza
componentes Descripción
Fabricante
TOP232G Datasheet PDF : 36 Pages
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Key Application Considerations
TOP232-234
TOPSwitch-FX vs. TOPSwitch-ll
Table 3 compares the features and performance differences
between TOPSwitch-FX and TOPSwitch-II. Many of the new
features eliminate the need for costly discrete component.
Other features increase the robustness of design allowing cost
savings in the transformer and other power components.
Function
TOPSwitch-II TOPSwitch-FX Figures Advantages
Soft-Start
N/A*
External Current Limit N/A*
DC
MAX
67%
Line Feed Forward with N/A*
DC Reduction
MAX
Line OV Shutdown
N/A*
Line UV Detection
N/A*
Switching Frequency 100 kHz ±10%
Switching Frequency
Option (TO-220 only)
N/A*
Frequency Jitter
Cycle Skipping
N/A*
N/A*
10 ms
Programmable
100% to 40% of
default current
limit
78%
78% to 38%
Single resistor
programmable
Single resistor
programmable
132 kHz ±7%
66 kHz ±7%
±4 kHz@132 kHz
±2 kHz@66 kHz
At DC (1.5%)
MIN
• Limits peak current and voltage
component stresses during start-up
• Eliminates external components
used for soft-start in most
applications
• Minimizes output overshoot
8, 17,
18, 21,
22
• Smaller transformer
• Higher efficiency
• Allows tighter power limit
during output overload conditions
4
• 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
4, 8, 14, • Rejects line ripple
23
• Increases transient and surge
voltage withstand capability
8, 14, • Increases voltage withstand cap-
16, 23 ability against line surge
5, 8, 14, • Prevents auto-restart glitches
15, 23 during power down
10
• Smaller transformer
• Fundamental below 150 kHz for
conducted EMI
11, 12
• 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)
6, 28 • Reduces conducted EMI
4
• Zero load regulation without dummy
load
• Low power consumption at no load
*Not available
Table 3. Comparison Between TOPSwitch-II and TOPSwitch-FX. (continued on next page)
19 B
7/01
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