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參數(shù)資料
| 型號(hào)： | PT4226 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 10 Watt Low-Profile 48V Input Isolated DC-DC Converter(10W，小外形，48V輸入，隔離DC-DC變換器（原始輸出電壓1.5V,可在指定范圍內(nèi)上下調(diào)整)) |
| 中文描述： | 10瓦低輪廓48V輸入隔離DC - DC轉(zhuǎn)換器（功率10W，小外形，48V的輸入，隔離的DC - DC變換器（原始輸出電壓為1.5V，可在指定范圍內(nèi)上下調(diào)整）） |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 221K |
| 代理商： | PT4226 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT4220/4240 Series
Using the Remote On/Off with the PT4220/4240
Isolated 10W Excalibur
DC/DC Converters
For applications requiring output voltage On/Off control,
the PT4220/4240 DC/DC converter series incorporates a
“Remote On/Off”
control (pin 1). This feature can be used
to switch the module off without removing the applied
input source voltage.
The converter functions normally with Pin 1 open-circuit,
providing a regulated output voltage when a valid source
voltage is applied to +V
in
(pin 5), with respect to –V
in
(pin 3). When a low-level
1
ground signal is applied to
pin 1, the converter output will be turned off.
Figure 1 shows an application schematic, which details
the typical use of the
Remote On/Off
function. Note the
discrete transistor (Q1). The pin has its own internal
pull-up, allowing it to be controlled with an open-collector
or open-drain device (See notes 2 & 3). Table 1 gives the
threshold requirements.
When placed in the “Off” state, the standby current drawn
from the input source is typically reduced to less than 1mA.
Table 1; Pin 1 Remote On/Of Control Parameters
1
Parameter
Min
Typ
Max
Enable (VIH)
Disable (VIL)
Vo/c [Open-Circuit]
Iin [pin 1 at –Vin]
4.5V
—
—
—
5.0V
—
—
0.8V
—
–0.5mA
Notes:
1. The
Remote On/Off
control uses –V
in
(pin 3) as its ground
reference. All voltages specified are with respect to –V
in
.
2. Use an open-collector device (preferably a discrete
transistor) for the
Remote On/Off
input. A pull-up resistor is
not necessary. To disable the output voltage, the control pin
should be pulled low to less than +0.8VDC.
3. The
Remote On/Off
pin may be controlled with devices that have
a totem-pole output. This is provided the drive voltage
meets the threshold requirements in Table 1.
Do not
apply
more than +20V. If a TTL gate is used, a pull-up resistor
may be required to the logic supply voltage.
4. The PT4220/4240 converters incorporate an “Under-
Voltage Lockout” (UVLO). The UVLO will keep the
module off when the input voltage to the converter is low,
regardless of the state of the
Remote On/Off
control. Table 2
gives the UVLO input voltage thresholds.
Figure 1
Turn-On Time:
In the circuit of Figure 1, turning Q
1
on applies a
low-voltage to pin 1 and disables the converter output.
Correspondingly, turning Q
1
off allows pin 1
to be pulled
high by an internal pull-up resistor. The converter produces a
regulated output voltage within 60ms. Although the rise-
time of the output is short (<5ms), the delay time will vary
depending upon the input voltage and the module’s internal
timing. Figure 2 shows shows an example of the output
response for a PT4223 (5.0V), following the turn-off of
Q
1
at time t =0. The waveform was measured with a 48Vdc
input voltage, and 3.3
resistive load.
Figure 2
R1
10k
Q1
BSS138
+V
o
-V
o
+V
in
-V
in
Vdd
1 =OFF
Note 1
U1a
Note 1
Note 1
PT4220/4240
+Vout
-Vout
+Vin
-Vin
Remote
On/Off
V
o
(adj)
1
3
5
8, 9
6, 7
10
0
10
20
30
40
50
t (milli-secs)
V
O
(2V/Div)
delay time
Table 2; UVLOThresholds
4
Series
V
in
Range
UVLOThreshold
PT4220
PT4240
36 – 75V
18 – 36V
32V ±2V
15.8V ±2V
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| PT4226A | 功能描述:CONVERTER DC-DC 1.5VIN 3.0A HRZ 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（最小）: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 |
| PT4226C | 功能描述:CONVERTER DC-DC 1.5VIN 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 |
| PT4226N | 功能描述:CONVERTER DC-DC 1.5VIN 3.0A VRT 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（最小）: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 |
| PT4227 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.3V 3.9W 48V-Input Isolated DC/DC Converter |
| PT4227A | 功能描述:DC/DC轉(zhuǎn)換器 1.3V 3.9W 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: |
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