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参数资料
| 型号： | PT4401A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 8/10页 |
| 文件大小： | 229K |
| 代理商： | PT4401A |
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 +Vin (pins 4, 5), with respect to
-Vin (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 (Q1). 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)
4.5V
—
Disable (VIL)
—
0.8V
Vo/c [Open-Circuit]
5.0V
Iin [pin 1 at –Vin]
—
–0.5mA
Notes:
1. The Remote On/Off control uses –Vin (pins 2, 3) as its
ground reference. All voltages are with respect to –Vin.
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 (VOH) meets the module’s minimum
VIH 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 Q1 on
applies a low-voltage to pin 1 and disables the converter
output. Correspondingly, turning Q1 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 Q1. The turn off of Q1 corresponds to the
drop in Q1 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
sns
+V
out
-V
out
-V
sns
21
17–20
13–16
12
711
810
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
Table 2; UVLO Thresholds 4
Series
Vin Range
UVLO Threshold
PT4400
36 – 75V
32V ±2V
Vo (1V/Div)
Iin (1A/Div)
Q1 Vgs (10V/Div)
HORIZ SCALE: 5ms/Div
Delay Time
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