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參數(shù)資料
| 型號： | PT4821C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 3-OUTPUT 35 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | METAL, SIP-21/18 |
| 文件頁數(shù)： | 22/34頁 |
| 文件大?。?/td> | 483K |
| 代理商： | PT4821C |
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Application Notes
29
Adjusting the Output Voltages of the PT4820
Triple-Output DC/DC Converters
The output voltages of the PT4820 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 a nominal ±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). Resistor val-
ues can be calculated using the appropriate formula (see
below) and the constants provided in Table 3-2. Alter-
natively the value may be selected directly from Table
3-3. The placement of each resistor is detailed as fol-
lows.
Adjust Up:
To increase a specific output, add a resistor R1
between the appropriate Vox Adj (Vo1 Adj, Vo2 Adj, or
Vo3 Adj) and the output common (COM). See Fig-
ure 3-1(a) and Table 3-1 for the resistor placement and
pin connections.
Figure 3-1b
PT4820 Series
Calculation of Adjust Values
The adjust resistor values may be calculated. Use the
applicable formula and select the appropriate constants
from Table 2 for the output and model being adjusted.
R1 [Adjust Up] 3
=
Ro Vr
– Rs
k
Va – Vo
(R2) [Adjust Down] 3
=
Ro (Va – Vr )
– Rs k
Vo – Va
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage from Table 3-2
Ro = The resistance value in Table 3-2
Rs = The series resistance from Table 3-2
(R
2)
+Vo
x
+V
x Adj
COM
+Vo
x
(Adjusted Down)
Output
Common
PT4820
9,10,14,18
#
# - 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
PT4820
9,10,14,18
#
# - 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
Vox Adj (Vo1, Vo2, or Vo3) and the output being adjusted.
See Figure 3-1(b) and Table 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
11
10
11
12
Vo2
15
14
15
16
Vo3
19
18
19
20
Notes:
1. Use only a single 1% (or better) tolerance resistor in
either the R1 or (R2) location to adjust a specific output.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors to any of the ‘Vox Adj’ pins. Any
capacitance added to these control pins will affect the
stability of the respective regulated output.
3. Adjustments made to any output must also comply with
the following limitations.
Vo1
≥ (Vo2 + 0.5V), and
Vo1
≥ (Vo3 + 0.5V)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4821N | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/2.5/1.5V 12A 48V Inpt Iso DC/DC Cnvtr 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 |
| PT4822 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:35-W Triple Output Isolated DC/DC Converter for Logic Applications |
| PT4822A | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/1.8/1.5V 12A 48V Inpt Iso DC/DC Cnvtr 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 |
| PT4822C | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/1.8/1.5V 12A 48V Inpt Iso DC/DC Cnvtr 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 |
| PT4822N | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/1.8/1.5V 12A 48V Inpt Iso DC/DC Cnvtr 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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