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參數(shù)資料
| 型號： | TDA 4605 |
| 廠商： | SIEMENS AG |
| 英文描述： | Control Circuit for Switch Mode Power Supplies Using MOS Transistors(用于開關(guān)電源的控制電路) |
| 中文描述： | 控制電路開關(guān)電源使用MOS晶體管用品（用于開關(guān)電源的控制電路） |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 631K |
| 代理商： | TDA 4605 |
Semiconductor Group
39
TDA 4605
Pin 8
The zero detector controlling the logic block recognizes the transformer being discharged by
positive to negative zero crossing of pin 8 voltage and enables the logic for a new pulse. Parasitic
oscillations occurring at the end of a pulse cannot lead to a new pulse (double-pulsing), because an
internal circuit inhibits the zero detector for a finite time
t
UL
after the end of each pulse.
Start-Up Behaviour
The start-up behaviour of the application circuit per sheet 48 is represented on sheet 50 for a line
voltage barely above the lower acceptable limit voltage value (without soft-start). After applying the
line voltage at the time
t
0
to the tollowing voltages built up:
–
V
6
corresponding to the half-wave charge current over
R
1
–
V
2
to
V
2 max
(typically 6.6 V)
–
V
3
to the value determined by the divider
R
10
/
R
11
.
The current drawn by the IC in this case is less than 1.6 mA. If
V
6
reaches the threshold
V
6E
(time
point
t
1
), the IC switches on the internal reference voltage. The currentdraw max. rises to 12 mA.
The primary current- voltage reproducer regulates
V
2
down to
V
2E
and the starting impulse
generator generates the starting impulses from time point
t
5
to
t
6
. The feedback to pin 8 starts the
next impulse and so on. All impulses including the starting impulse are controlled in width by
regulating voltage of pin 1. When switching on this corresponds to a short-circuit event, i.e.
V
1
= 0.
Hence the IC starts up with "short-circuit impulses" to assume a width depending on the regulating
voltage feedback (the IC operates in the overload range). The maximum pulse width is reached at
time point
t
2
(
V
2
=
V
2 max
). The IC operates at the overload point. Thereafter the peak values ot
V
2
decrease rapidly, as the IC is operating within the regulation range. The regulating loop has built
up. If voltage
V
6
falls below the switch-off threshold
V
6 min
before the reversal point is reached, the
starting attempt is aborted (pin 5 is switched to low). As the IC remains switched on,
V
6
further
decreases to
V
6
. The IC switches off;
V
6
can rise again (time point 14) and a new start-up attempt
begins at time point
t
1
. If the rectified alternating line voltage (primary voltage) collapses during
load,
V
3
can fall below
V
3A
, as is happening at time point
t
3
(switch-on attempt when voltage is too
low). The primary voltage monitor then clamps
V
3
to
V
3S
until the IC switches off (
V
6
<
V
6A
). Then
a new start-up attempt begins at time point
t
1
.
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TDA46052HKLA1 | 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:IC POWER SUPPLY CONTROLLER 8DIP |
| TDA46053 | 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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