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參數(shù)資料
| 型號： | TDA 4605-3 |
| 廠商： | SIEMENS AG |
| 英文描述： | Control IC for Switched-Mode Power Supplies using MOS-transistors(開關(guān)模式電源控制IC) |
| 中文描述： | 控制芯片的開關(guān)模式電源使用馬鞍山晶體管（開關(guān)模式電源控制集成電路） |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 557K |
| 代理商： | TDA 4605-3 |
Semiconductor Group
78
TDA 4605-3
Circuit Description
Application Circuit
The application circuit shows a flyback converter for video recorders with an output power rating of
70 W. The circuit is designed as a wide-range power supply for AC-line voltages of 180 to 264 V.
The AC-input voltage is rectified by the bridge rectifier GR1 and smoothed by
C
1
. The NTC limits
the rush-in current.
In the period before the switch-on threshold is reached the IC is suppled via resistor
R
1
; during the
start-up phase it uses the energy stored in
C
2
, under steady state conditions the IC receives its
supply voltage from transformer winding
n
1
via diode D1. The switching transistor T1 is a BUZ 90.
The parallel connected capacitor
C
3
and the inductance of primary winding
n
2
determine the
system resonance frequency. The
R
2
-
C
4
-D2 circuitry limits overshoot peaks, and
R
3
protects the
gate of T1 against static charges.
During the conductive phase of the power transistor T1 the current rise in the primary winding
depends on the winding inductance and the mains voltage. The network consisting of
R
4
-
C
5
is used
to create a model of the sawtooth shaped rise of the collector current. The resulting control voltage
is fed into pin 2 of the IC. The RC-time constant given by
R
4
-
C
5
must be designed that way that
driving the transistor core into saturation is avoided.
The ratio of the voltage divider
R
10
/
R
11
is fixing a voltage level threshold. Below this threshold the
switching power supply shall stop operation because of the low mains voltage. The control voltage
present at pin 3 also determines the correction current for the fold-back point. This current added to
the current flowing through
R
4
and represents an additional charge to
C
5
in order to reduce the turn-
on phase of T1. This is done to stabilize the fold-back point even under higher mains voltages.
Regulation of the switched-mode power supplies via pin 1. The control voltage of winding
n
1
during
the off period of T1 is rectified by D3, smoothed by
C
6
and stepped down at an adjustable ratio by
R
5
,
R
6
and
R
7
. The
R
8
-
C
7
network suppresses parasitic overshoots (transformer oscillation). The
peak voltage at pin 2, and thus the primary peak current, is adjusted by the IC so that the voltage
applied across the control winding, and hence the output voltages, are at the desired level.
When the transformer has supplied its energy to the load, the control voltage passes through zero.
The IC detects the zero crossing via series resistors
R
9
connected to pin 8. But zero crossings are
also produced by transformer oscillation after T1 has turned off if output is short-circuited. Therefore
the IC ignores zero crossings occurring within a specified period of time after T1 turn-off.
The capacitor
C
8
connected to pin 7 causes the power supply to be started with shorter pulses to
keep the operating frequency outside the audible range during start-up.
On the secondary side, five output voltages are produced across winding
n
3
to
n
7
rectified by D4 to
D8 and smoothed by
C
9
to
C
13
. Resistors
R
12
,
R
14
and
R
19
to
R
21
are used as bleeder resistors.
Fusable resistors
R
15
to
R
18
protect the rectifiers against short circuits in the output circuits, which
are designed to supply only small loads.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA4605-3 | 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 |
| TDA46053HKLA1 | 制造商:Infineon Technologies AG 功能描述:Controller Switch Mode Power Supply 8-Pin PDIP 制造商:Infineon Technologies AG 功能描述:AC/DC STANDALONE - Rail/Tube 制造商:Infineon Technologies AG 功能描述:IC POWER SUPPLY CONTROLLER 8DIP |
| TDA46053XKLA1 | 制造商:Infineon Technologies AG 功能描述:AC/DC STANDALONE - Rail/Tube |
| TDA4605A | 制造商:STMicroelectronics 功能描述: |
| TDA4605D | 制造商:STMicroelectronics 功能描述: |
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