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| 型號： | TOP250R |
| 英文描述： | Up to 290 W Extended power. design flexible. |
| 中文描述： | 高達(dá)290瓦的擴(kuò)展能力。設(shè)計靈活。 |
| 文件頁數(shù)： | 28/52頁 |
| 文件大小： | 468K |
| 代理商： | TOP250R |
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TOP242-250
28
K
9/03
General Information & Table of Contents
D
reduction optimized for
forward design
40% of positive (turn-on)
threshold
Product Selector Guide 1
in addition to duty cycle during soft-
start further reduces peak current
and voltage
Further reduces component
stresses during start up
Design Ideas 4
Design Tools 5
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.
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 conduction
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.
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-GXAC-DC Seminar 10
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.
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 practical
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
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 sufficient heat
sinking to keep device temperature
≤
100
°
C. Power
TOPSwitch-GX
Selection
Selecting the optimum
TOPSwitch
-
GX
depends upon required
Function
TOPSwitch-FX
TOPSwitch-GX
TOPSwitch-GX
Advantages
P/G Package Current
Limits
Identical to Y
packages
TOP243-245 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)
Minimizes transformer core size
Optimizes efficiency for most
applications
Allows higher output powers in
high ambient temperature
applications
Reduces output line frequency
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*
10 ms (duty cycle) 10 ms (duty cycle + current
limit)
Gradually increasing current limit
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
Primary Clamp and Output Reflected Voltage V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TOP250R- | 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 |
| TOP250RN- | 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 |
| TOP250RN-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 |
| TOP250R-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 55 W 85-265 VAC 82 W 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 |
| TOP250Y | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 210 W 85-265 VAC 290 W 230 VACX 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 |
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