- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378075 > PT3668 (Texas Instruments, Inc.) 30-A Dual Output Isolated DC/DC Converter PDF資料下載
參數(shù)資料
| 型號： | PT3668 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 30-A Dual Output Isolated DC/DC Converter |
| 中文描述： | 30雙輸出隔離式DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 317K |
| 代理商： | PT3668 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT3660, PT4660 & PT4680 Series
Operating Features & System Considerations for the
PT3660/4660/4680 Dual-Output Converters
Over-Current Protection
The dual-outputs of the PT3660, PT4660, and PT4680
series of DC/DC converters have independent output
voltage regulation and current limit control. Applying a
load current in excess of the current limit threshold at
either output will cause the respective output voltage to
drop. However, the voltage at Vo
2
is derived from Vo
1
.
Therefore a current limit fault on Vo
1
will also cause Vo
2
to drop. Conversely, a current limit fault applied to Vo
2
will only cause Vo
2
voltage to drop, and Vo
1
will remain
in regulation.
The current limit circuitry incorporates a limited amount
of foldback. The fault current flowing into an absolute
short circuit is therefore slightly less than the current
limit threshold. Recovery from a current limit fault is
automatic and the converter will not be damaged by a
continuous short circuit at either output.
Output Over-Voltage Protection
Each output is monitored for over voltage (OV). For fail
safe operation and redundancy, the OV fault detection
circuitry uses a separate reference to the voltage regula-
tion circuits. The OV threshold is fixed, and set nominally
25% higher than the set-point output voltage. If either
output exceeds the threshold, the converter is shutdown
and must be actively reset. The OV protection circuit
can be reset by momentarily turning the converter off.
This is accomplished by either cycling one of the output
enable control pins (EN1 or EN2), or by removing the
input power to the converter.
Note: If Vo
1
or Vo
2
is adjusted
to a higher voltage, the margin between the respective steady-
state output voltage and its OV threshold is reduced. This can
make the module sensitive to OV fault detection, that may
result from random noise and load transients.
Over-Temperature Protection
The converter has an internal temperature sensor. At a
case temperature of approximately 115°C the converter
will shut down, and will automatically restart when the
temperature returns to about 100°C. The analog voltage
generated by the sensor is also made available at the
‘TEMP’ output (pin 5), and can be monitored by the
host system for diagnostic purposes. Consult the ‘Pin
Descriptions’ section of the data sheet for further infor-
mation on this feature.
Under-Voltage Lock-Out
The Under-Voltage Lock-Out (UVLO) circuit prevents
operation of the converter whenever the input voltage to
the module is insufficient to maintain output regulation.
The UVLO has approximately 2V of hysterisis. This is
to prevent oscillation with a slowly changing input volt-
age. Below the UVLO threshold the module is off and
the enable control inputs, EN1 and EN2 are inoperative.
Primary-Secondary Isolation
The PT4460/80 and PT3660 series of DC/DC converters
incorporate electrical isolation between the input termi-
nals (primary) and the output terminals (secondary). All
converters are production tested to a withstand voltage
of 1500VDC. The isolation complies with UL60950 and
EN60950, and the requirements for operational isolation.
This allows the converter to be configured for either a
positive or negative input voltage source.
The regulation control circuitry for these modules is
located on the secondary (output) side of the isolation
barrier. Control signals are passed between the primary
and secondary sides of the converter via a proprietory
magnetic coupling scheme. This eliminates the use of
opto-couplers. The data sheet ‘Pin Descriptions’ and
‘Pin-Out Information’ provides guidance as to which
reference (primary or secondary) that must be used for
each of the external control signals.
Fuse Requirements
To comply with safety agency requirements, these con-
verters
must
be operated with an external input fuse.
A fast-acting 250-V fuse is required. Table 1-1 gives
the recommended current rating for the product series
being used.
Table 1-1; Recommended Fuse Rating
Product
Input
Series
Bus
Total
Iout
Fuse
Rating
PT4660
PT4680
PT3660
48V
24V
48V
20A
20A
30A
7A
10A
7A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT4100-48V | 48V 15 WATT ISOLATED DC-DC CONVERTER |
| PT4102A | 48V 15 WATT ISOLATED DC-DC CONVERTER |
| PT4102C | 48V 15 WATT ISOLATED DC-DC CONVERTER |
| PT4103A | 48V 15 WATT ISOLATED DC-DC CONVERTER |
| PT4103C | 48V 15 WATT ISOLATED DC-DC CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT368 | 制造商:NIEC 制造商全稱:Nihon Inter Electronics Corporation 功能描述:DIODE MODULE 30A/800V/1000V |
| PT36CB010 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Programmable Delay Line |
| PT36CB020 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Programmable Delay Line |
| PT36CB030 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Programmable Delay Line |
| PT36CB050 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Programmable Delay Line |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。