- 您現在的位置：買賣IC網 > PDF目錄362330 > AN-26 TOPSwitch-FX Flyback Quick Selection Curves PDF資料下載
參數資料
| 型號： | AN-26 |
| 英文描述： | TOPSwitch-FX Flyback Quick Selection Curves |
| 中文描述： | 的TOPSwitch - FX的反激式快速選擇曲線 |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 387K |
| 代理商： | AN-26 |
February
2000
TOPSwitch
Quick Selection Curves
Application Note AN-26
-FX
Flyback
QUICK START
Introduction
This application note is for engineers starting a flyback power
supply design with
TOPSwitch-FX
. It offers a quick method to
select the proper
TOPSwitch-FX
device from parameters that
are usually not available until much later in the design process.
The
TOPSwitch-FX
Flyback Quick Selection Curves provide
the essential design guidance to estimate requirements before
even starting to build a prototype.
Curves estimating the efficiency of the Power Supply and the
corresponding dissipation for the
TOPSwitch-FX
devices are
provided. They form a powerful tool for estimating cost and
project requirements before even committing to or starting
development. This application note is similar to AN-21 ‘Quick
Selection Curves’ for the
TOPSwitch-II
family.
Overview of Quick Selection Curves
The
TOPSwitch-FX
Quick Selection Curves (Figures 1-4)
show the expected power supply efficiency and expected
TOPSwitch-FX
dissipation for typical applications. Power
supplies with either a 5 V or a 12 V output, operating with either
Universal input (85 - 265 VAC) or Single 230 VAC input
voltage (195 - 265 VAC) are described.
The solid lines in the Quick Selection Curves give a typical
efficiency figure for a given load, depending upon the
TOPSwitch-FX
device used. Each solid line efficiency curve
extends to the maximum power capability of the device. The
superimposed dashed lines are contours of constant
TOPSwitch-FX
device dissipation and the intersections these
dashed lines make with the solid lines provide the corresponding
dissipation at different loads. The dissipation at intermediate
points can be found by interpolation or extrapolation.
Selection Curve Assumptions
The Selection Curves are based on specific design assumptions
which are now detailed.
The switching frequency is 130 kHz in all cases.
Universal input (85 - 265 VAC) curves in Figures 1 and 2
assume a worst-case input line condition of
85 VAC and an average voltage across the bulk capacitor
of 105 VDC (peak of 120 V and trough of 90 V).
The single 230 VAC input (195 - 265 VAC) curves in
Figures 3 and 4 assume a worst case of 195 VAC and an
average voltage across the bulk capacitor of over
250 VDC (peak of 275 V and trough of 230 V).
For Universal input the input bulk capacitor is sized at
3
μ
F/W. For the single voltage input case the input bulk
capacitor is similarly 1
μ
F/W.
1) Determine which graph (Figures. 1, 2, 3 or
4) is closest to your application.
Example: Use Figure 1 for Universal input,
12 V output.
2) Find your power requirement on the X- axis.
3) Move vertically from your power require-
ment until you intersect with a
TOPSwitch-FX
curve (solid line).
4) Read the associated efficiency on the
Y- axis.
5) Determine if this is the appropriate efficiency
for your application. If not, continue to the
next
TOPSwitch-FX
curve.
6) Read
TOPSwitch-FX
power dissipation from
the dashed contours to determine heatsink
requirements.
7) Start the design. Use the
TOPSwitch-FX
Transformer Design Spreadsheet.
Note: See 'Selection Curve Assumptions' for limits of use.
相關PDF資料 |
PDF描述 |
|---|---|
| AN-35 | LinkSwitch Design Guide |
| AN002M4-78 | SP4T RF Absorptive Switch |
| AN002R2-29 | SPDT RF Reflective Switch |
| AN002R2-53 | SPDT RF Reflective Switch |
| AN1081 | Voltage-Feedback Operational Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AN2600000707051B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.45 GHz ISM-band antenna for Bluetooth and WLAN IEEE 802.11b |
| AN2600000707051F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.45 GHz ISM-band antenna for Bluetooth and WLAN IEEE 802.11b |
| AN2600000707051K | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.45 GHz ISM-band antenna for Bluetooth and WLAN IEEE 802.11b |
| AN2600000707054B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.45 GHz ISM-band antenna for Bluetooth and WLAN IEEE 802.11b |
| AN2600000707054F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.45 GHz ISM-band antenna for Bluetooth and WLAN IEEE 802.11b |
發(fā)布緊急采購，3分鐘左右您將得到回復。