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参数资料
| 型号： | PT4243C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SIP-10 |
| 文件页数： | 4/9页 |
| 文件大小： | 191K |
| 代理商： | PT4243C |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
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 +Vin (pin 5), with respect to –Vin
(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/Off Control Parameters 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 (pin 3) 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. 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 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 60ms.
Figure 2 shows shows the output response of a PT4223
(5.0V) 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 waveform was
measured with a 48Vdc input voltage, and a 1.4A resis-
tive load.
Figure 2
R1
10k
Q1
BSS138
+V
o
-V
o
+V
in
-V
in
Vdd
1 =OFF
Note 1
U1a
Note 1
PT4220/4240
+ V out
-Vout
+Vin
-Vin
Remote
On/Off
V
o (adj)
1
3
5
8, 9
6, 7
10
Table 2; UVLO Thresholds 4
Series
Vin Range
UVLO Threshold
PT4220
36 – 75V
32V ±2V
PT4240
18 – 36V
15.8V ±2V
Vo (2V/Div)
Iin (0.2A/Div)
Q1Vgs (10V/Div)
HORIZ SCALE: 10ms/Div
Delay Time
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