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參數(shù)資料
| 型號(hào)： | PT4221 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.8Vout 5W 48V-Input Isolated DC/DC Converter |
| 中文描述： | 1.8V 輸出、5W 48V 輸入隔離 DC/DC 轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 221K |
| 代理商： | PT4221 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Adjusting the Output Voltage of the 10W
Excalibur Series of Isolated DC-DC Converters
The factory pre-set output voltage of Power Trends’ 10W
Excalibur series of isolated DC-DC converters may be
adjusted over a narrow range. This is accomplished with
the addition of a single external resistor. For the input
voltage range specified in the data sheet, Table 1 gives the
allowable adjustment range for each model as V
o
(min) and
V
o
(max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor, R
2
between pin 10 (V
o
adjust), and
pins 6 & 7 (–V
out
).
Adjust Down:
Add a resistor
(R
1
)
, between pin 10 (V
o
adjust)
and pins 8 & 9 (+V
out
).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor,
(R
1
)
or R
2
.
The values of (R
1
) [adjust down], and R
2
[adjust up], can
also be calculated using the following formulas.
(R
1
)
=
56.2 (V
a
– 1.225)
V
o
– V
a
– R
s
k
Table 1
DC-DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
24V Bus
PT4246
48V Bus
PT4226
Rated Current
3
3A
PT4241
PT4221
3A
PT4245
PT4225
3A
PT4242
PT4222
3A
PT4243
PT4223
2A
PT4244
PT4224
0.85A
Vo(nom)
Vo(min)
Vo(max)
Rs (k
)
1.5V
1.45V
1.65V
243.0
1.8V
1.7V
1.98V
243.0
2.5V
2.25V
2.75V
187.0
3.3V
2.95V
3.65V
187.0
5.0V
4.5V
5.5V
110.0
12.0V
10.8V
13.2V
49.9
Figure 1
PT4220/4240
+Vout
-Vout
+Vin
-Vin
Remote
On/Off
V
o
(adj)
1
3
5
8, 9
6, 7
10
L
O
A
D
+V
in
-V
in
+V
O
–V
O
(R1)
Adj Down
R2
Adjust Up
R
2
=
68.845
V
a
– V
o
– R
s
k
Where,
V
o
V
a
R
s
= Original output voltage
= Adjusted output voltage
= Internal resistance (Table 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 to V
o
adjust. Any capacitance added
to the V
o
adjust control pin will affect the stability of the ISR.
3. The output power is limited to 10W. If the output voltage
is increased, the maximum load current must be derated
according to the following equation.
I
o
(max)
= 10
V
a
In any instance, the load current must not exceed the
converter’s rated current (See Table 1).
PT4220/4240 Series
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PT4221A | 功能描述:DC/DC轉(zhuǎn)換器 1.8Vout 5W 48V-Input Iso DC/DC Converter 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: |
| PT42-21B | 制造商:EVERLIGHT 制造商全稱:Everlight Electronics Co., Ltd 功能描述:1.8mm Round Subminiature Chip Phototransistor |
| PT42-21B/TR8 | 功能描述:光電晶體管 IR Phototransistor 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 |
| PT42-21B-TR8 | 制造商:EVERLIGHT 制造商全稱:Everlight Electronics Co., Ltd 功能描述:1.8mm Round Subminiature Chip Phototransistor |
| PT4221C | 功能描述:CONVERTER DC-DC 1.8VIN 3.0A SMD RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:PT4220 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?36V 電壓 - 輸入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:3.3A 電源（瓦） - 制造商系列:30W 電壓 - 隔離:1.5kV（1500V） 特點(diǎn):- 安裝類型:表面貼裝 封裝/外殼:19-SIP SMD 模塊 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包裝:托盤 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
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