參數(shù)資料
型號(hào)： TOP243F
廠商： POWER INTEGRATIONS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.44 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZIP6
封裝： PLASTIC, TO-262, 7/6 PIN
文件頁(yè)數(shù)： 21/52頁(yè)
文件大?。?/td> 2175K
代理商： TOP243F
TOP242-250
N
4/05
28
Function
TOPSwitch-FX TOPSwitch-GX
TOPSwitch-GX
Advantages
Light Load Operation Cycle skipping
Frequency and duty
cycle reduction
Improves light load efciency
Reduces no-load consumption
Line Sensing/Exter-
nally Set Current
Limit (Y, R and F
Packages)
Line sensing and
externally set current
limit mutually
exclusive (M pin)
Line sensing and
externally set current
limit possible simul-
taneously (functions
split onto L and X pins
Additional design exibility allows all
features to be used simultaneously
Current Limit
Programming Range
100% to 40%
100% to 30%
Minimizes transformer core size in highly
continuous designs
P/G Package Current
Limits
Identical to Y
package
TOP243-246 P and
G packages internal
current limits reduced
Matches device current limit to package
dissipation capability
Allows more continuous design to lower
device dissipation (lower RMS currents)
Y/R/F Package
Current Limits
100% (R and F
package N/A*)
90% (for equivalent
R
DS(ON))
Minimizes transformer core size
Optomizes efciency for most applications
Thermal Shutdown
125 °C min.
70 °C hysteresis
130 °C min.
75 °C hysteresis
Allows higher output powers in high
ambient temperature applications
Maximum Duty Cycle
Reduction Threshold
90 A
60 A
Reduces output line frequency ripple at
low line
DC
MAX reduction optimized for forward
designs using TOP248, TOP249 and
TOP250
Line Under-Voltage
Negative (turn-off)
Threshold
N/A*
40% of positive
(turn-on) threshold
Provides a well dened turn-off threshold
as the line voltage falls
Soft-Start
10 ms (duty cycle)
10 ms (duty cycle +
current limit)
Gradually increasing current limit in
addition to duty cycle during soft-start
further reduces peak current and voltage
Further reduces component stresses
during start up
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.
Other features increase the robustness of design, allowing cost
savings in the transformer and other power components.
TOPSwitch-GX
Design Considerations
Power Table
Data sheet power table (Table 1) represents the maximum
practical continuous output power based on the following
conditions: TOP242 to TOP246: 12 V output, Schottky output
diode, 150 V reected voltage (V
OR) and efciency estimates
from curves contained in application note AN-29. TOP247
to TOP250: Higher output voltages, with a maximum output
current of 6 A.
For all devices, a 100 VDC minimum for 85-265 VAC and
250 VDC minimum for 230 VAC are assumed and sufcient
heat sinking to keep device temperature ≤100 °C. Power
levels shown in the power table for the R package device
assume 6.45 cm2 of 610 g/m2 copper heat sink area in an
enclosed adapter, or 19.4 cm2 in an open frame.
TOPSwitch-GX
Selection
Selecting the optimum TOPSwitch-GX depends upon required
maximum output power, efciency, heat sinking constraints
and cost goals. With the option to externally reduce current
limit, a larger TOPSwitch-GX may be used for lower power
applications where higher efciency is needed or minimal heat
sinking is available.
Table 5. Comparison Between TOPSwitch-FX and TOPSwitch-GX.
*Not available
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TOP243F- 制造商:POWERINT 制造商全稱(chēng):Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP243FN 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 30W 85-265 VAC 45W 230 VAC RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開(kāi)關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel
TOP243FN- 制造商:POWERINT 制造商全稱(chēng):Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP243FN-TL 制造商:POWERINT 制造商全稱(chēng):Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP243F-TL 制造商:POWERINT 制造商全稱(chēng):Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
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