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參數(shù)資料
| 型號： | PT4687N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 20-A 24-V Input Dual Output Isolated DC/DC Converter |
| 中文描述： | 20，一個24 V輸入雙輸出隔離式DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 290K |
| 代理商： | PT4687N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
0
5
10
15
20
25
30
35
t (milliseconds)
Vo
1
(2V/Div)
Vo
2
(2V/Div)
I
IN
(0.5A/Div)
Figure 3; Vo
1
, Vo
2
Power-Up Sequence
PT4660 & PT4680 Series
On/Off Output Voltage Sequencing
The output voltages from the PT4660 series of DC/
DC converters are independantly regulated, and are
internally sequenced to meet the power-up requirements
of popular microprocessor and DSP chipsets. Figure 3
shows the waveforms from a PT4661 after the converter
is enabled at t=0s. During power-up, the Vo
1
and Vo
2
voltage waveforms typically track within 0.4V prior to
Vo
2
reaching regulation. The waveforms were measured
with a 5-Adc resistive load at each output, and with a 48-
VDC input source applied. The converter typically
produces a fully regulated output within 25ms. The
actual turn-on time will vary slightly with input voltage,
but the power-up sequence is independent of the load at
either output.
Using the On/Off Enable Controls on the PT4660
and PT4680 Series of DC/DC Converters
The PT4660 (48V input) and PT4680 (24V input) series
of 75-W dual-output DC/DC converters incorporates
both positive and negative logic
Output Enable
controls.
EN1 (pin 3) is the positive enable input, and EN2 (pin 4)
is the negative enable input. Both inputs are TTL logic
compatible, and are electrically referenced to -V
in
(pin 2)
on the primary (input) side of the converter. A pull-up
resistor is not required, but may be added if desired.
Adding a pull-up resistor from either input, up to +V
in
,
will not damage the converter.
Automatic (UVLO) Power-Up
Connecting EN1 (pin 3) to -V
in
(pin 2) and leaving EN2
(pin 4) 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 ±V
in
. (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 function,
connect EN1 (pin 3) to -V
in
(pin 2), and apply the system
On/Off control signal to EN2 (pin 4). In this configura-
tion, a logic ‘0’ (-V
in
potential) applied to pin 4 disables
the converter outputs. An example of this configuration is
detailed in Figure 1.
Negative Output Enable (Positive Inhibit)
To configure the converter for a negative enable function,
EN2 (pin 4) is left open circuit, and the system On/Off
control signal is applied to EN1 (pin 3). A logic ‘0’ (-V
in
potential) must then be applied to pin 3 in order to
PT4660
EN 1*
EN 2
–Vin
–V
IN
1 =Outputs Off
4
3
2
BSS138
PT4660
EN 1*
EN 2
–Vin
–V
IN
4
3
2
1 =Outputs On
BSS138
Figure 2; Negative Enable Configuration
Figure 1; Positive Enable Configuration
During turn-off, both outputs drop rapidly due to the
discharging effect of actively switched rectifiers. The
voltage at Vo
1
remains higher than Vo
2
during this pe-
riod. The discharge time is typically 100μs, but will vary
with the amount of external load capacitance.
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 ±V
in
.
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