參數(shù)資料
型號(hào)： TOP242F
英文描述： SMPS Controller
中文描述： 開關(guān)電源控制器
文件頁(yè)數(shù)： 29/52頁(yè)
文件大?。?/td> 457K
代理商： TOP242F
TOP242-250
29
H
9/02
Table 5 (cont). Comparison Between TOPSwitch-FX and TOPSwitch-GX.
*Not available
TOPSwitch-GX
Design Considerations
Power Table
Data sheet power table (Table 1) represents the maximum practi-
cal continuous output power based on the following conditions:
TOP242 to TOP246: 12 V output, Schottky output diode, 150 V
reflected voltage (V
) and efficiency estimates from curves con-
tained 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 sufficient heat
sinking to keep device temperature
≤
100
°
C. Power
levels shown in the power table for the R package device
assume 6.45 cm
2
of 610 g/m
2
copper heat sink area in an
enclosed adapter, or 19.4 cm
2
in an open frame.
TOPSwitch-GX
Selection
Selecting the optimum
TOPSwitch
-
GX
depends upon required
maximum output power, efficiency, 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 efficiency is needed or minimal heat
sinking is available.
Function
TOPSwitch-FX
TOPSwitch-GX
TOPSwitch-GX
Advantages
P/G Package Current
Limits
Identical to Y
packages
TOP243P or G and
TOP244P or G internal
current limits reduced
Matches device current limit to
package dissipation capability
Allows more continuous design to
lower device dissipation (lower RMS
currents)
Minimizes transformer core size
Optimizes efficiency for most
applications
Allows higher output powers in
high ambient temperature
applications
Reduces output line frequency
ripple at low line
D
reduction optimized for
forward design
Provides a well defined turn-off
threshold as the line voltage falls
Y/R/F Package Current
Limits
100% (R and F
package N/A*)
90% (for equivalent R
DS (ON)
)
Thermal Shutdown
125
°
C min.
70
°
C hysteresis
130
°
C min. 75
°
C
hysteresis
Maximum Duty Cycle
Reduction Threshold
90
μ
A
60
μ
A
Line Under-Voltage
Negative (turn-off)
Threshold
Soft-Start
N/A*
40% of positive (turn-on)
threshold
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
Input Capacitor
The input capacitor must be chosen to provide the minimum DC
voltage required for the
TOPSwitch
-
GX
converter to maintain
regulation at the lowest specified input voltage and maximum
output power. Since
TOPSwitch
-
GX
has a higher DC
than
TOPSwitch-II
, it is possible to use a smaller input capacitor.
For
TOPSwitch
-
GX,
a
capacitance of 2
μ
F per watt is possible
for universal input with an appropriately designed transformer.
Primary Clamp and Output Reflected Voltage V
A primary clamp is necessary to limit the peak
TOPSwitch
-
GX
drain to source voltage. A Zener clamp requires few parts and
takes up little board space. For good efficiency, the clamp
Zener should be selected to be at least 1.5 times the output
reflected voltage V
as this keeps the leakage spike conduc-
tion time short. When using a Zener clamp in a universal input
application, a V
of less than 135 V is recommended to allow
for the absolute tolerances and temperature variations of the
Zener. This will ensure efficient operation of the clamp circuit
and will also keep the maximum drain voltage below the rated
breakdown voltage of the
TOPSwitch
-
GX
MOSFET.
相關(guān)PDF資料
PDF描述
TOP242G-TL SMPS Controller
TOP242R-TL SMPS Controller
TOP243F SMPS Controller
TOP243G SMPS Controller
TOP243G-TL SMPS Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TOP242F- 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP242FN 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 10W 85-265 VAC 15 W230 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
TOP242FN- 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP242FN-TL 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP242F-TL 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*