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參數(shù)資料
| 型號： | PTH04040WAST |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, DIP-20 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 747K |
| 代理商： | PTH04040WAST |
Application Notes
For technical support and further information visit http://power.ti.com
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Pre-Bias Startup Capability
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of a power module prior
to its output becoming active. This often occurs in com-
plex 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 as part of a dual-supply power-up sequencing
arrangement. A prebias can cause problems with power
modules that incorporate synchronous rectifiers. This is
because under most operating conditions, these types of
modules can sink as well as source output current.
The PTH/PTV family of power modules incorporate
synchronous rectifiers, but will not sink current during
startup 1, or whenever the Inhibit pin is held low. However,
to ensure satisfactory operation of this function, certain
conditions must be maintained. 2 Figure 3-9 shows an
application demonstrating the pre-bias startup capability.
The start-up waveforms are shown in Figure 3-10. Note
that the output current from the PTH03010W (Io) shows
negligible current until its output voltage rises above
that backfed through diodes D1 and D2.
Note: The pre-bias start-up feature is not compatible with
Auto-Track. When the module is under Auto-Track control,
it will sink current if the output voltage is below that of a
back-feeding source. To ensure a pre-bias hold-off one of two
approaches must be followed when input power is applied to
the module. The Auto-Track function must either be disabled 3,
or the module’s output held off (for at least 50 ms) using the
Inhibit pin. Either approach ensures that the Track pin volt-
age is above the set-point voltage at start up.
Notes
1. Startup includes the short delay (approx. 10 ms) prior to
the output voltage rising, followed by the rise of the
output voltage under the module’s internal soft-start
control. Startup is complete when the output voltage has
risen to either the set-point voltage or the voltage at the
Track pin, whichever is lowest.
2. To ensure that the regulator does not sink current when
power is first applied (even with a ground signal applied to
the Inhibit control pin), the input voltage must always be
greater than the output voltage throughout the power-
up and power-down sequence.
3. The Auto-Track function can be disabled at power up by
immediately applying a voltage to the module’s Track pin
that is greater than its set-point voltage. This can be
easily accomplished by connecting the Track pin to Vin.
V
o = 2.5 V
V
IN = 3.3 V
R
2
2k21
ASIC
VCORE
VCCIO
I
o
PTH03010W
1
10
4
5
6
2
3
98
Track
V
IN
V
O
GND
Inhibit
7
Vadj
Sense
+
C
IN
330 F
+
C
OUT
330 F
+
Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup
Vin (1 V/Div)
Vo (1 V/Div)
Io (5 A/Div)
HORIZ SCALE: 5 ms/Div
Figure 3–10; Pre-Bias Startup Waveforms
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| PTH04040WAZ | 功能描述:DC/DC轉(zhuǎn)換器 60A 3.3/5V-In Wide Output Adj Pwr Mdl 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH04040WAZT | 功能描述:DC/DC轉(zhuǎn)換器 2.95-5.5Vin 0.8-3.6V 2.045" x1.045"x0.357 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH04070W | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A, 3.3/5-V INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTH04070W_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A, 3.3/5-V INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTH04070WAD | 功能描述:DC/DC轉(zhuǎn)換器 3-A 3.3/5-V Input Adj Swtch Regulator 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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