參數(shù)資料
型號(hào)： PT4842C
英文描述： DC to DC Converter
中文描述： DC至DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 11/14頁(yè)
文件大小： 216K
代理商： PT4842C
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
PT4842N DC to DC Converter
PT5541 A 25V Single N-Channel HEXFET Power MOSFET in a DirectFET SQ package rated at 59 amperes optimized with low on resistance for applications such as active OR'ing. Shipped in Tape and Reel only. Part is not available in bulk, TR is implied in part number.; A IRF6622 with Standard Tape and Reel Quantity of 4800
PT5542 A 25V Single N-Channel HEXFET Power MOSFET in a DirectFET SQ package rated at 59 amperes optimized with low on resistance for applications such as active OR'ing. Shipped in Tape and Reel only. Part is not available in bulk, TR is implied in part number.; Similar to IRF6622 qualified for use with lead free solder shipped in tape and reel 4800 pieces
PT5544 8V 1.75A. 5-V Input Step-Up (Boost) ISR
PT5545 30V Single N-Channel HEXFET Power MOSFET in a I-Pak package; A IRLU2703 with Standard Packaging
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PT4842N 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(fēng)格:SMD/SMT
PT4850 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications
PT4850F 制造商:SHARP 制造商全稱:Sharp Electrionic Components 功能描述:Thin Type Phototransistor
PT4850FE000F 功能描述:光電晶體管 PT4800F with IC bin 0.12-0.56mA RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗電流:200 nA 封裝 / 箱體:T-1
PT4851 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*