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參數(shù)資料
| 型號(hào)： | tDa 4601 |
| 廠商： | SIEMENS AG |
| 英文描述： | Control ICs for Switched-Mode Power Supplies(應(yīng)用于開關(guān)電源的控制類芯片) |
| 中文描述： | 控制芯片的開關(guān)電源（應(yīng)用于開關(guān)電源的控制類芯片） |
| 文件頁數(shù)： | 25/26頁 |
| 文件大?。?/td> | 1384K |
| 代理商： | TDA 4601 |
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Semiconductor Group
31
TDA 4601
Notes on Application Circuit 7
Wide Range SMPS with Reducing Peak Collector Current
I
C BU 208
for Rising Line Voltage
(variable point of return)
Wide range SMPS have to be dimensioned at line voltages of 90 to 260 Vac. The difference
between the maximum collector current
I
C BU 208 max
and the largest possible limit current
I
C BU 208 limit
which causes magnetic saturation of the flyback transformer and flows through the
primary inductance winding 5/7 is to be determined at Vac
min
(
I
C BU 208 limit
≥
1.2 x
I
C BU 208 max
).
Then, the transmissible power of the flyback transformer and its value at Vac
max
is to be determined.
In the standard circuit the collector current
I
C BU 208 max
is almost constant at the point of return
independent of the line voltage. The transmissible power on the secondary side, however,
increases at the point of return in proportion to the rising rectified line voltage applied (
figures 1 and
2
).
In the wide range SMPS a line voltage ratio of 270/90 = 3/1 is obtained, causing doubling of the
transmissible power on the secondary side, i.e. in the wide range SMPS a far too large flyback
transformer had to be implemented.
The point of return protecting the SMPS against overloads or short circuits, is derived from the time
constant at pin 4
t 4
= 270 k
x 4.7 nF. Thus, the largest possible pulse width is determined.
With the introduction of the 33-k
resistor this time constant is reduced as a function of the control
voltage applied to winding 13/15, rectified by diode BY 360 and filtered by the 1-
μ
F capacitance,
which means that the pulse time becomes shorter. By means of the Z-diode C
18
the line voltage
level can be defined at which the influence of the time constant correction becomes noticeable. The
change in the rectified voltage of winding 13/15 is proportional to the change in the rectified line
voltage.
At the point of return
I
C BU 208
the peak collector current has been reduced with the aid of the given
values from 5.2 A at 90 Vac to 3.3 A at 270 Vac. The transmissible power at the point of return
remains stable between 125 and 270 Vac due to the set activation point of the point of return
correction (unbroken curve in
figure 2
).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA4601-D | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Control ICs for Switched-Mode Power Supplies |
| TDA4605 | 功能描述:視頻 IC SMPS Controller RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TDA4605_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS |
| TDA46052 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TDA4605-2 | 功能描述:軟開關(guān) PWM 控制器 CTRL IC FOR SWITCH MODE PWR SUPPLIES RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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