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參數資料
| 型號： | PT5813N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| 中文描述： | 20 - 3.3 - V輸入可調集成開關穩(wěn)壓器 |
| 文件頁數： | 5/11頁 |
| 文件大?。?/td> | 202K |
| 代理商： | PT5813N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Startup of the PT5800 & PT5810 Series ISRs
with Back-Feeding Source (Pre-Bias Capability)
In complex digital systems an external voltage can
sometimes be present at the output of the regulator
during power up. For example, this voltage may be
backfed through a dual-supply logic component such as
an FPGA or ASIC. Another path might be via a clamp
diode (to a lower supply voltage) as part of a power-up
sequencing implementation.
Although the PT5800 (5-V input) and PT5810 (3.3-V
input) series of regulators will sink current under steady-
state operating conditions, they will not do so during
startup
1
as long as certain conditions are maintained
2
.
This feature allows these regulators to start up while an
external voltage is simultaneously applied to the output.
Figure 2-1 is an application schematic that demonstrates
this capability. The waveforms in Figure 2-2 show the
behavior of the circuit as input power is applied. Note
that the plot of the regulator output current (I
o
) is approxi-
mately zero up to the timestamp ‘A’, even though a voltage
is initially backfed to the output via the 3.3-V input supply
and diodes D
1
& D
2
. The regulator sources current
3
when
it begins raising the output above the back-fed voltage to
its nominal regulation value.
Notes
1. Startup includes both the application of a valid input
source voltage, or the removal of a ground signal from
the
Inhibit*
control (pin 2) 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.
Vin (1V/Div)
Vo (1V/Div)
Io (5A/Div)
HORIZ SCALE 5ms/Div
A
Figure 2-2; Power-up Waveforms with Back-Feeding Source
Figure 2-1; Schematic Demonstrating Startup into Pre-Bias Capability
PT5812
14
–
17
9
–
13
5
–
7V
IN
V
OUT
GND
C
out
+
C
IN
+
(3.3 VDC)
COM
COM
V
IN
V
O
(2.5 V)
8
18
Sense(+)
Sense(
–
)
D
2
I
o
D
1
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 an external source backfeeding the regulator’s output
is greater than the nominal regulation voltage, the output
will begin sinking current at the end of its soft-start
power-up sequence. If this current exceeds the rated
output, the module could be overstressed.
PT5800 & PT5810 Series
相關PDF資料 |
PDF描述 |
|---|---|
| PT5814A | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| PT5814N | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| PT5815A | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| PT5815C | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| PT5815N | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PT5814 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.5V 20-A. 3.3-V Input Adjustable Step-Down ISR |
| PT5814A | 功能描述:開關變換器、穩(wěn)壓器與控制器 1.5V 20-A 3.3V Inpt Adj Step-Down ISR 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 |
| PT5814C | 功能描述:DC/DC轉換器 1.5V 20-A 3.3V Inpt Adj Step-Down ISR RoHS:否 制造商:Murata 產品: 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: |
| PT5814N | 功能描述:開關變換器、穩(wěn)壓器與控制器 1.5V 20-A 3.3V Inpt Adj Step-Down ISR 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 |
| PT5815 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.2V 20-A. 3.3-V Input Adjustable Step-Down ISR |
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