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參數(shù)資料
| 型號： | PT4401 |
| 英文描述： | 100V Single N-Channel HEXFET Power MOSFET in a I-Pak package; Similar to IRFU120Z with Lead Free Packaging |
| 中文描述： | 1.3至3.5V 70W的功率。 48 - V輸入隔離DC / DC轉換器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 205K |
| 代理商： | PT4401 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4400 Series
Using the Remote On/Off Function on the PT4400
Series of Isolated DC/DC Converters
For applications requiring output voltage On/Off control,
the PT4400 DC/DC converter series incorporates a
“Re-
mote 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
(pins 4, 5), with respect to
-V
in
(pins 2, 3). When a low-level
1
ground signal is
applied to pin 1, the converter output will be turned off.
Figure 1 is an application schematic, which shows the
typical use of the
Remote On/Off
function. Note the dis-
crete transistor (Q
1
). The Remote On/Off 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/Off Control Requirements
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
(pins 2, 3) as its
ground reference. All voltages 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 +0.8V.
3. The
Remote On/Off
pin may be controlled with devices that
have a totem-pole output. This is provided the output
high-level voltage (V
OH
) meets the module’s minimum
V
IH
specified 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 PT4400 converters incorporate an “Under-Voltage
Lockout” (UVLO). The UVLO keeps the converter
off until the input voltage is close to the minimum
specified operating voltage. This is 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 con-
verter produces a regulated output voltage within 50ms.
Figure 2 shows the output response of a PT4401 following
the turn-off of Q
1
. The turn off of Q
1
corresponds to the
drop in Q
1
Vgs. Although the rise-time of the output
voltage is short (<5ms), the indicated delay time will
vary depending upon the input voltage and the module’s
internal timing. The output voltage of the PT4401 was
set to 3.3V by connecting VID0 (pin 7), VID2 (pin 9),
and VID3 (pin 10) to the (–)Remote Sense (pin 12). The
waveforms were measured with 48VDC input voltage,
and a 10A resistive load.
Figure 2
L
O
A
D
PT4401
+V
s n s
+V
out
-V
out
-V
s n s
21
17
–
20
13
–
16
12
7
11
8
10
9
VID0 - VID4
+V
in
–
V
in
4, 5
2, 3
1
Remote
On/Off
PROGRAMMING PINS
+3.3V
+V
IN
–
V
IN
0V
–
REMOTE SENSE
+ REMOTE SENSE
C
o
+
R1
10k
Q1
BSS138
Vdd
1 =OFF
Note 1
U1a
Note 1
Note 1
Table 2; UVLO Thresholds
4
Series
V
in
Range
36 – 75V
UVLO Threshold
PT4400
32V ±2V
Vo (1V/Div)
Iin (1A/Div)
Q1 Vgs (10V/Div)
HORIZ SCALE: 5ms/Div
Delay Time
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PDF描述 |
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| PT4402 | 75-W 48-V Input Isolated DC/DC Converter(75W，48V，輸入隔離DC/DC轉換器) |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PT4401A | 功能描述:直流/直流開關轉換器 1.3-3.5V 70W 48V Inp Iso DC/DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 |
| PT4401N | 功能描述:DC/DC轉換器 1.3-3.5V 70W 48V Inp Iso DC/DC Cnvtr 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PT4402 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.05 to 1.75V 20A. 48 V-Input Isolated DC/DC Converter |
| PT4402A | 功能描述:CONVERTER DC-DC 48VIN 20A HORZ RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT4400 設計資源:Maxi/Mini/Micro Design Guide, Appl Manual 標準包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點:* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT4403 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3.4V to 5.7V 75-W. 48 V-Input DC/DC Converter |
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