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參數(shù)資料
| 型號(hào)： | PT4854N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 3-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SIP-26/25 |
| 文件頁(yè)數(shù)： | 3/15頁(yè) |
| 文件大?。?/td> | 268K |
| 代理商： | PT4854N |
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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltages of the PT4850
Triple-Output DC/DC Converters
The output voltages of the PT4850 series of triple-output
DC/DC converters, Vo1, Vo2 and Vo3, are independently
adjustable. The adjustment method uses a single external
resistor, 1 which may be used to adjust a selected output
by up to ±10% from the factory preset value. The value
of the resistor determines the magnitude of adjustment,
and the placement of the resistor determines the direction
of adjustment (up or down). The resistor values can be
calculated using the appropriate formula (see below),
using the constants provided in Table 3-2. Alternatively
the resistor value may be selected directly from Table 3-3
and Table 3-4, for Vo1 and Vo2/Vo3 respectively. The
placement of each resistor is as follows.
Adjust Up:
To increase a specific output, add a resistor R1
between the appropriate Vx Adj (V1 Adj, V2 Adj, or V3 Adj)
and the output common (COM). See Figure 3-1(a)
and Table 3-1 for the resistor placement and pin connec-
tions.
Figure 3-1b
PT4850 Series
Calculation of Adjust Values
The adjust resistor value may also be calculated using an
equation. In each case, the equation for R1 [Adjust Up] is
different to that for (R2) [Adjust Down]. For the PT4850
series, the following points should be noted.
Vo1 uses different equations to Vo2 and Vo3. The
equations are defined for the desired output voltage.
The equations for Vo2 and Vo3 are based on the
percentage of desired adjustment. Both Vo2 and Vo3
use the same constants, which are common for all
output voltages.
Vo1 Adjust:
R1 [Adjust Up] 3
=
2.5 Ro
– Rs
k
Va – Vo
(R2) [Adjust Down] 3
=
Ro (Va – 2.5 ) – R
s
k
Vo – Va
Where: Vo = Original output voltage
Va = Adjusted output voltage
Ro = The resistance value in Table 3-2
Rs = The series resistance from Table 3-2
Vo2 / Vo3 Adjust:
R1 [Adjust Up] 3
=
50 Ro
–Rs
k
n%
(R2) [Adjust Down] 3 =Ro
(50 – n%) –R
s
k
n%
Where: Ro = The resistance value in Table 3-2
Rs = The series resistance from Table 3-2
n% = The desired adjustment from the
nominal (in percent)
(R
2)
+Vo
x
+V
x Adj
COM
+Vo
x
(Adjusted Down)
Output
Common
PT4850
#
# - See Table 3-1 for pin connections,
where Vo
x equals Vo 1, Vo2, or Vo 3
Figure 3-1a
R
1
+Vo
x
+V
x Adj
COM
+Vo
x
(Adjusted Up)
Output
Common
PT4850
#
# - See Table 3-1 for pin connections,
where Vo
x equals Vo 1, Vo2, or Vo 3
Adjust Down:
Add a resistor (R2), between the appropriate
Vx Adj (V1 Adj, V2 Adj, or V3 Adj) and the output being
adjusted, +Vox. See Figure 3-1(b) and Table 3-1 for the
resistor placement and pin connections.
Table 3-1; Adjust Resistor Pin Connections
To Adjust Up
To Adjust Down
Connect R1
Connect (R2)
from
to
from
to
Vox Adj
COM
Vox Adj
Vox
Vo1
812
8
9
Vo2
17
18
17
16
Vo3
21
18
21
22
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|---|---|
| PT4855 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications |
| PT4855A | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4855C | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4855N | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4856 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications |
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