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參數(shù)資料
| 型號： | PT6440 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 6A Adjustable Step-Down ISR Family |
| 中文描述： | 6A 可調(diào)節(jié)步降 ISR 系列 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 178K |
| 代理商： | PT6440 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6440 Series
Adjusting the Output Voltage of the PT6440
Excalibur
5V/3.3V Bus Step-Down ISRs
The output voltage of the PT6440 Series ISRs may be
adjusted higher or lower than the factory trimmed pre-
set voltage with the addition of a single external resistor.
Table 1 gives the allowable adjustment range for each
model for either series as V
a
(min) and V
a
(max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R
2
, between V
o
Adj (pin 12) and GND
(pins 5–8).
Adjust Down:
Add a resistor
(R
1
)
, between V
o
Adj (pin 12)
and V
out
(pins 9–11).
Figure 1
The values of
(R
1
)
[adjust down], and R
2
[adjust up], can
also be calculated using the following formulas. Refer to
Figure 1 and Table 2 for both the placement and value of the
required resistor; either
(R
1
)
or R
2
as appropriate.
(R
1
)
=
R
o
(V
a
– 0.9)
V
o
– V
a
– R
s
k
R
2
=
0.9 R
o
V
a
– V
o
– R
s
k
Where:
V
o
V
a
R
o
= The resistance value from Table 1
R
s
= The series resistance from Table 1
= Original output voltage
= Adjusted output voltage
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. #
PT6441
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
Vo (nom)
Va (min)
Va (max)
Ro (k
)
Rs (k
)
3.3
2.88
3.5
10.0
49.9
2.5
1.97
2.95
10.0
20.0
2.0
1.64
2.45
10.0
20.0
1.8
1.5
2.25
10.0
20.0
1.5
1.3
1.95
10.0
20.0
1.2
1.08
1.65
10.0
20.0
1.0
0.97
1.45
10.2
20.0
R
Adjust Up
C
2
+V
O
COM
COM
+V
IN
+
(R
)
Adj Down
PT6440
2,3,4
5–8
12
9,10,11
Vin
Vo
Vo(adj)
GND
C
1
+
Notes:
1. Use only a single 1% resistor in either the
(R
1
)
or R
2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adj to either GND or
V
out
. Any capacitance added to the V
o
adjust pin will affect
the stability of the ISR.
3. For each model, adjustments to the output voltage may
place additional limits on the minimum input voltage.
The revised minimum input voltage must comply with the
following requirement.
V
in
(min) = (V
a
+ 0.5)V or as specified in the data sheet,
whichever is greater.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6441 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator |
| PT6441A | 功能描述:DC/DC轉(zhuǎn)換器 3.3Vout 6A 5V-Inp Adj Step-Down ISR 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: |
| PT6441C | 功能描述:DC/DC轉(zhuǎn)換器 3.3Vout 6A 5V-Inp Adj Step-Down ISR 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: |
| PT6441N | 功能描述:DC/DC轉(zhuǎn)換器 3.3Vout 6A 5V-Inp Adj Step-Down ISR 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: |
| PT6442 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator |
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