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參數(shù)資料
| 型號(hào)： | PT4314C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 2-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SMD-9 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | PT4314C |
Application Notes
For technical support or further information,visit http://power.ti.com
PT4310 Series
Using the Remote On/Off Function on the
PT4310 Isolated Dual Output DC/DC Converters
For applications requiring output voltage On/Off control,
the PT4310 DC/DC converter series incorporates a
“Remote On/Off” control (pin 11). This feature can be used
when there is a requirement for the module to be switched
off without removing the applied input source voltage.
The converter operates normally with Pin 11 open-circuit,
and produces a regulated output voltage when a valid
source voltage is applied to +Vin (pin 18), with respect
to –Vin (pin 17). When a low-level 1 ground signal is
applied to pin 11, the converter output will be turned off.
Figure 2-1 shows an application schematic, which details
the typical use of the Remote On/Off function. Note the
discrete transistor (Q1). The control pin has its own
internal pull-up, and must be controlled with an open-
collector or open-drain device (See notes 2 & 3). Table 2-1
gives the input requirements.
When placed in the “Off” state, the standby current drawn
from the input source is typically reduced to less than 1 mA.
Table 2-1; Remote On/Off Control Requirements 1
Parameter
Min
Typ
Max
Disable
–0.1 V
—
1 V
Enable
5 V 3
—
Open-Circuit 2
Vo/c [Open-Circuit]
—
10 V
Iin [pin 11 at –Vin]
—
–200 A
—
Notes:
1. The Remote On/Off control uses –Vin (pin 17) as its
ground reference. All voltages specified are with respect
to –Vin.
2. Use an open-collector device (preferably a discrete
transistor) for the Remote On/Off input. Do not connect
a pull-up resistor directly to pin 11.
3. The Remote On/Off pin may be controlled with devices that
have a totem-pole output providing that a blocking
diode is used. The blocking diode is required to prevent
current from being injected into On/Off control pin.
Note: For TTL devices a pull-up may be required on the
cathode side of the blocking diode. This is to guarantee a
minimum enable voltage at pin 11 (See Figure 2-1).
4. The PT4310 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 2-2 gives the UVLO input voltage thresholds.
Figure 2-1
Turn-On Time:
In the circuit of Figure 2-1, turning Q1 on
applies a low-voltage to pin 11 and disables the converter
output. Correspondingly, turning Q1 off allows the con-
verter to power up and produce a regulated output voltage
within 50 ms. Although the rise-time of the output is short
(<1ms), the delay time will vary depending upon the input
voltage and the module’s internal timing. Figure 2-2
shows response of the +5-V output from the PT4311
(±5 V), following the turn-off of Q1 at time t =0. The
waveform was measured with a 48 Vdc input voltage,
and 0.25-Adc resistive load at both the positive and
negative outputs.
Figure 2-2
R1
10k
Q1
BSS138
+V
o
-V
o
+V
in
-V
in
Vdd
1 =OFF
Note 1
U1a
Note 1
D1
1N4148 #
# or similar low-leakage PIN diode
PT4310
+Vin
-Vin
±Vo
Adjust
11
17
18
1
2
3
COM
Remote
On/Off
12
Vo
1 ( + )
Vo
2 ( – )
0
5
10
15
20
25
30
time (milli-secs)
VO (2V/Div)
delay time
Table 2-2; UVLO Thresholds 4
Series
Vin Range
UVLO Threshold
PT4310
38 – 75 V
36 ±2 V
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