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參數(shù)資料
| 型號： | PTH05000W |
| 英文描述： | Fully-integrated linear lighting ballast, IR21571, European version, 230VAC line, 36W/T8 lamp |
| 中文描述： | 6答：5 - V輸入寬輸出調(diào)節(jié)插入電源模塊 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 286K |
| 代理商： | PTH05000W |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PTH05000W Startup with Output Pre-Bias
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of the power module
prior to its output voltage rising. This often occurs in
complex digital systems when current from another power
source is backfed through a dual-supply logic component
such as an FPGA or ASIC. Another path might be via
clamp diodes (to a higher supply voltage) as part of a
sequential power-up arrangement.
An output prebias can cause problems with power modules
that incorporate synchronous rectifiers. This is because
under most operating conditions, they can sink as well as
source ouput current. Although the PTH05000W (5-V
input) power module can sink current under normal op-
eration, it will not do so during startup.
1
This is true as
long as certain conditions are maintained.
2
Figure 3-1
shows an application schematic that demonstrates this
capability. Figure 3-2 shows the waveforms of the circuit
after input power is applied. Note that the module’s out-
put current (I
o
) is never negative. Only positive current
is sourced. This occurs when the output voltage is raised
above that which is backfed from the 5-V input supply, via
the diodes D
1
through D
4
.
3
Notes
1. Start up includes both the application of a valid input
source voltage, or the removal of a ground signal from
the
Inhibit*
control (pin 3) with a valid input source
applied. The output of the regulator is effectively off
(tri-state), during the period that the
Inhibit*
control is
held low.
Figure 3-2; Start-up with Output Pre-Bias
Figure 3-1; Schematic Demonstrating Startup with Output Pre-Bias
2. To ensure that the regulator does not sink current, the
input voltage must always be greater or equal to the
output voltage throughout the power-up and power-down
sequence.
3. If during power up, the backfeeding source is greater
than the module’s set-point voltage, the module’s
output voltage will remain higher than its set point.
The output will remain out of regulation until the back-
feeding source is either reduced in voltage or removed.
PTH05000W
Vin (1 V/Div)
Vo (1 V/Div)
Io (2 A/Div)
HORIZ SCALE: 5 ms/Div
PTH05000W
V
IN
=5 V
1
4
5
2
3
C
330 μF
(Required)
+
C
100 μF
(Optional)
+
Inhibit
GND
V
O
=2.5 V
2k32
0.1 W, 1 %
V
O
Adj
GND
Inhibit
V
IN
V
O
L
O
A
D
GND
D
1
- D
4
MUR460
0.55
Resistive
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PTH05000WAD | 功能描述:DC/DC轉(zhuǎn)換器 6A 5VInput Wide-Out Adj Plug-in Pwr Mod RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH05000WAH | 功能描述:DC/DC轉(zhuǎn)換器 6A 5VInput Wide-Out Adj Plug-in Pwr Mod RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH05000WAH | 制造商:POWER TRENDS 功能描述:IC DC/DC 5VIN 6A ADJ O/P 5000 |
| PTH05000WAH | 制造商:Texas Instruments 功能描述:Supply Voltage Max.:5.5V |
| PTH05000WAS | 功能描述:DC/DC轉(zhuǎn)換器 6A 5VInput Wide-Out Adj Plug-in Pwr Mod RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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