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參數(shù)資料
| 型號： | PT4841A |
| 英文描述： | 100V Single N-Channel HEXFET Power MOSFET in a TO-220 FullPak (Iso) package; Similar to IRLI520N with Lead Free Packaging |
| 中文描述： | DC至DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 216K |
| 代理商： | PT4841A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PT4840
Dual Output Voltage DC/DC Converters
The Vo
2
and Vo
3
output voltages from the PT4840 se-
ries of DC/DC converters can be independantly adjusted
by up to ±10% from their factory pre-set voltage. The
method of adjustment uses a single external resistor.
1
The value of the resistor determines the magnitude of
adustment, and the placement of the resistor determines
the direction of adjustment (up or down). The resistor
value can be calculated directly from a simple formula.
The constants are given in Table 1. Alternatively, Table 2
provides the resistor values for a select number of output
voltages. The placement of each resistor is as follows.
Vo
2
Adjust Up:
To increase the output, add a resistor R
1
between pin 17 (Vo
2
Adjust) and pin 18 (COM).
Vo
2
Adjust Down:
Add a resistor
(R
2
)
, between pin 17
(Vo
2
Adjust) and pin 16 (+Vo
1
).
Vo
3
Adjust Up:
Add a resistor R
3
between pin 21
(Vo
3
Adjust) and pins 20 (COM).
Vo
3
Adjust Down:
Add a resistor
(R
4
)
between pin 21
(Vo
3
Adjust) and pin 22 (+Vo
3
).
Refer to Figure 1 for further information on resistor
placement.
Figure 1
Notes:
1. Use only a single 1% resistor in either the R
1
or
(R
2
)
location to adjust Vo
2
, and in the R
3
or
(R
4
)
location to
adjust Vo
3
. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors to either the Vo
2
Adjust or
Vo
3
Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
The adjust resistor values may be calculated. Use the
applicable formula and select the appropriate constants
from Table 1 for the output and model being adjusted.
R
1
or R
3
=
R
o
· V
r
– R
s
k
V
a
– V
o
(R
2
)
or
(R
4
)
=
R
o
(V
a
– V
r
)
V
o
– V
a
– R
s
k
Where: V
o
= Original output voltage, (Vo
2
or Vo
3
)
V
a
= Adjusted output voltage
V
r
= The reference voltage from Table 1
R
o
= The resistance value in Table 1
R
s
= The series resistance from Table 1
PT4840 Series
+V
IN
–
V
IN
+Vo
1
+Vo
2
+Vo
3
PT4840
1
2
11
15, 16
22, 23
3
Vo
1
COM
COM
Vo
2
Vo
3
+V
IN
-V
IN
EN 1
Vo
2
adj
Vo
3
adj
17
21
C
OUT 1
C
OUT 3
C
OUT 2
C
IN
4
EN 2
(R
4
)
Adj Down
R
3
Adjust Up
(R
2
)
Adj Down
R
1
Adjust Up
12, 13
18
–
20
COM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT4841C | 20V Single N-Channel HEXFET Power MOSFET in a SO-8 package; A IRF7456 with Standard Packaging |
| PT4841N | DC to DC Converter |
| PT4842 | 12V/3.3V/1.8V 48V-Input 62-Watt Triple-Output DC/DC Converter |
| PT4842A | 55V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; Similar to IRF1405S with Lead Free Packaging |
| PT4842C | DC to DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4841C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| PT4841N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| PT4842 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12V/3.3V/1.8V 48V-Input 62-Watt Triple-Output DC/DC Converter |
| PT4842A | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 12/3.3/1.8V 48V-Inp 62W 3-Out DC-DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| PT4842C | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 12/3.3/1.8V 48V-Inp 62W 3-Out DC-DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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