參數(shù)資料
型號(hào)： AN-18
英文描述： TOPSwitch Flyback Transformer Construction Guide
中文描述： 回掃變壓器的TOPSwitch施工指南
文件頁(yè)數(shù)： 5/32頁(yè)
文件大?。?/td> 275K
代理商： AN-18
A
7/96
AN-18
5
a factor of four. This is especially important for low power
applications using TOP200 and TOP210 to prevent spurious
triggering of the
TOPSwitch
current limit by the initial current
spike generated when
TOPSwitch
turns on and discharges the
transformer winding capacitance.
Primary Bias Winding
The optimum placement of the primary bias winding will
depend on whether the power supply uses a primary referenced
or secondary referenced regulation scheme. If the power supply
is regulated from the secondary side, the bias winding should be
placed between the primary and secondary, as shown in Figures
7A and 7 C. When placed between the primary and secondary,
the bias winding acts as an EMI shield connected to the primary
return, reducing the conducted EMI generated by the power
supply. In margin wound designs for secondary regulated
supplies, placing the primary bias winding between the primary
and secondary also minimizes the number of margins and
reinforced insulation layers in the transformer.
Primary Winding
In all the transformer construction styles depicted in Figure 7,
the primary winding (or a portion of it) is always the first or
innermost winding on the bobbin. This keeps the mean length
of wire per turn as short as possible, reducing the primary
winding parasitic capacitance. Also, if the primary winding is
the innermost winding on the transformer, it will be shielded by
the other transformer windings, helping to reduce noise coupling
from the primary winding to adjacent components. The driven
end of the primary winding (the end connected to the
TOPSwitch
drain) should be at the start of the winding. This allows the half
of the primary winding with the largest voltage excursion to be
shielded by other windings or by the second half of the primary
winding, reducing EMI coupled from the primary side of the
transformer to other parts of the supply. The primary winding
should be designed for two winding layers or less. This
minimizes the primary winding capacitance and the leakage
inductance of the transformer. Adding a layer of tape between
primary layers can reduce the primary winding capacitance by
PRIMARY FINISH LEAD
(WITH SLEEVING)
REINFORCED
INSULATION
BASIC
INSULATION
PIN
MARGIN (4x)
PI-1799-030896
SECONDARY
PRIMARY BIAS
PRIMARY FINISH
PRIMARY START
Figure 7A. Margin Wound Secondary Regulated Transformer.
PRIMARY FINISH LEAD
(WITH SLEEVING)
REINFORCED
INSULATION
BASIC
INSULATION
PIN
PI-1800-030896
SECONDARY
PRIMARY BIAS
PRIMARY FINISH
PRIMARY START
MARGIN (6x)
Figure 7B. Margin Wound Primary Regulated Transformer.
PRIMARY FINISH LEAD
(WITHOUT SLEEVING)
REINFORCED
INSULATION
BASIC
I
PIN
PI-1801-030896
TRIPLE INSULATED
SECONDARY
PRIMARY BIAS
PRIMARY FINISH
PRIMARY START
Figure 7C. Triple Insulated Secondary Regulated Transformer.
PRIMARY FINISH LEAD
(WITHOUT SLEEVING)
REINFORCED
INSULATION
BASIC
I
PIN
PI-1802-030896
TRIPLE INSULATED
SECONDARY
PRIMARY FINISH
PRIMARY START
PRIMARY BIAS
Figure 7D. Triple Insulated Primary Regulated Transformer.
相關(guān)PDF資料
PDF描述
AN-19 TOPSwitch Flyback Power Supply Efficiency
AN-20 Transient Suppression Techniques for TOPSwitch Power Supplies
AN-22 OBSOLETE when inventory is depleted. 10% tolerance no l
AN-23 TinySwitch Flyback Design Methodology
AN-29 TOPSwitch-GX Flyback Quick Selection Curves
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AN-181 制造商:FLORIDA MISC. 功能描述: 制造商:Florida Misc. 功能描述:
AN18101A-VF 制造商:MATSUSHITA_PANA 功能描述:
AN18103A-VB 制造商:MATSUSHITA_PANA 功能描述:
AN1812 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:Freescale Semiconductor, Inc.
AN1816 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:USING THE HC912B32 TO IMPLEMENT THE DISTRIBUTED SYSTEMS INTERFACE (DSI) PROTOCOL
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(xiě)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

*
*
*