TOP242-249 POWERINT [Power Integrations, Inc.], TOP242-249 Datasheet - Page 28

• Manufacturer Part Number: TOP242-249
• Description: Family Extended Power, Design Flexible,Integrated Off-line Switcher
• Manufacturer: POWERINT [Power Integrations, Inc.]

Table 4 (cont). Comparison Between TOPSwitch-II and TOPSwitch-GX. *Not available
TOPSwitch-FX vs. TOPSwitch-GX
Table 5 compares the features and performance differences
between TOPSwitch-GX and TOPSwitch-FX. Many of the new
features eliminate the need for additional discrete components.
Table 5. Comparison Between TOPSwitch-FX and TOPSwitch-GX. (continued on next page)
Function
Remote ON/OFF
Synchronization
Thermal Shutdown
Current Limit Tolerance ±10% (@25 °C)
DRAIN
Creepage
at Package
DRAIN Creepage at
PCB for Y and R
Packages
28
Function
Light Load Operation
Line Sensing/Externally Line sensing and
Set Current Limit
(Y and R Packages)
Current Limit
Programming
Range
TOP242-249
E
7/01
SMD
TO-220 0.046" / 1.17 mm
August 8, 2000
DIP
N/A*
N/A*
125 °C min.
Latched
-8% (0 °C to100 °C) -4% (0 °C to 100 °C)
0.037" / 0.94 mm
0.037" / 0.94 mm
0.045" / 1.14 mm
(R Package N/A*)
TOPSwitch-FX
Cycle skipping
externally set
current limit
mutually
exclusive (M pin)
100-40%
TOPSwitch-II
Single transistor
or optocoupler
interface or manual
switch
Single transistor
or optocoupler
interface
Hysteretic 130 °C
min. Shutdown (with
75 °C hysteresis)
±7% (@25 °C)
0.137" / 3.48 mm
0.137" / 3.48 mm
0.068" / 1.73 mm
0.113" / 2.87 mm
(preformed leads)
TOPSwitch-GX Figures TOPSwitch-GX Advantages
Frequency and Duty Cycle
reduction
Line sensing and externally
set current limit possible
simultaneously
(functions split onto
L and X pins)
100-30%
TOPSwitch-GX
Other features increase the robustness of design allowing cost
savings in the transformer and other power components.
11, 22, • Fast on/off (cycle by cycle)
23, 24, • Active-on or active-off control
25, 26, • Low consumption in remote off state
27, 29, • Active-on control for fail-safe
36, 37, • Eliminates expensive in-line on/off
38, 39,
40
• Allows processor controlled turn
• Permits shutdown/wake-up of
• Synchronization to external lower
• Starts new switching cycle on
• Automatic recovery from thermal
• Large hysteresis prevents circuit
• 10% higher power capability due to
• Greater immunity to arcing as a
• Preformed leads accommodate
• Easier to meet Safety (UL/VDE)
• Improves light load efficiency
• Reduces no-load consumption
• Additional design flexibility allows all
• Minimizes transformer core size
switch
on/off
peripherals via LAN or parallel port
frequency signal
demand
fault
board overheating
tighter tolerance
result of build-up of dust, debris and
other contaminants
large creepage for PCB layout
in highly continuous designs
TOPSwitch-GX Advantages
features to be used simultaneously