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參數(shù)資料
| 型號(hào)： | PT4741N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 4-OUTPUT 70 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 14/14頁(yè) |
| 文件大?。?/td> | 321K |
| 代理商： | PT4741N |
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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4741
Figure 3; PT4741 Power-up Sequence
On/Off Output Voltage Sequencing
The PT4741 converter power-up characteristics meet
the requirements of Texas Instruments’ TNETD7112
dual-channel line-interface driver/receiver ICs. All four
outputs from the converter are internally sequenced to
power up in unison. Figure 3 shows the waveforms from
a PT4741 following the application of power. There is a
delay of appoximately 25ms from the application power
to the point that the output voltages begin to rise. The
converter typically produces a fully regulated output
within 75ms.The waveforms of Figure 3 were measured
with loads of approximately 50% on each output, with
an input source of 48VDC.
Using the On/Off Enable Controls on the PT4741
Quad-Output DC/DC Converter
The PT4741 is a quad-output DC/DC converter that is
specifically designed for powering DSL line driver ICs.
The converter incorporates two output enable controls.
EN1 (pin 4) is the Negative Enable input, and EN2 (pin 3)
is the Positive Enable input. Both inputs are electrically
referenced to –Vin (pin 2) on the primary or input side of
the converter. A pull-up resistor is not required, but may
be added if desired. Voltages of up to 70V can be safely
applied to the either of the Enable pins.
Automatic (UVLO) Power-Up
Connecting EN1 (pin 4) to -Vin (pin 2) and leaving EN2
(pin 3) open-circuit configures the converter for auto-
matic power up. (See data sheet “Typical Application”).
The converter control circuitry incorporates an “Under
Voltage Lockout” (UVLO) function, which disables the
converter until the minimum specified input voltage is
present at ±Vin. (See data sheet Specifications). The UVLO
circuitry ensures a clean transition during power-up and
power-down, allowing the converter to tolerate a slow-
rising input voltage. For most applications EN1 and
EN2, can be configured for automatic power-up.
Positive Output Enable (Negative Inhibit)
To configure the converter for a positive enable func-
tion, connect EN1 (pin 4) to -Vin (pin 2), and apply the
system On/Off control signal to EN2 (pin 3). In this
configuration, a low-level input voltage (-Vin potential)
applied to pin 3 disables the converter outputs. Figure 1
is an example of this configuration.
Negative Output Enable (Positive Inhibit)
To configure the converter for a negative enable function,
EN2 (pin 3) is left open circuit, and the system On/Off
control signal is applied to EN1 (pin 4). A low-level
input voltage (-Vin potential) must then be applied to
DC/DC
Module
EN 1*
EN 2
–Vin
–V
IN
1 =Outputs Off
3
4
2
BSS138
DC/DC
Module
EN 1*
EN 2
–Vin
–V
IN
1 =Outputs On
3
4
2
BSS138
Figure 2; Negative Enable Configuration
Figure 1; Positive Enable Configuration
pin 4 in order to enable the outputs of the converter.
An example of this configuration is detailed in Figure 2.
Note: The converter will only produce and output voltage if a
valid input voltage is applied to ±Vin.
HORIZ SCALE: 10ms/Div
+Vo1 (2V/Div)
+Vo2 (2V/Div)
–Vo2 (2V/Div)
–Vo1 (2V/Div)
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