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參數(shù)資料
| 型號(hào)： | PT4842N |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 216K |
| 代理商： | PT4842N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4840 Series
Operating Features of the PT4840 Triple-Output
DC/DC Converters
Over-Current Protection
The current limit function of the PT4840 series of
triple-output DC/DC converters is divided into two
zones. These are the high-voltage output Vo
1
, and the
two low-voltage outputs (combined) Vo
2
/Vo
3
.
A load fault applied to Vo
1
will cause this output voltage
to drop. A drop in Vo
1
(to less than 10V) will also cause
outputs Vo
2
and Vo
3
to simultaneously turn off. Load
faults applied to either Vo
2
or Vo
3
will cause both these
outputs to drop, but in this case Vo
1
will be unaffected.
Each protection zone incorporates a latch-off time-out
period of approximately 200ms. A transient or momentary
fault lasting less than this period will allow the prompt
recovery of all affected outputs. Faults applied for longer
than this period will cause the affected zone to latch off.
Faults applied to Vo
2
or Vo
3
results in the latch off of both
these outputs; Vo
1
being unaffected, whereas the latch
off of Vo
1
will shut down all three outputs. Recovery
from a latched shutdown condition requires the removal
and corresponding re-application of input power to the
converter.
Over-Temperature Protection
The PT4840 DC/DC converter series have an internal
temperature sensor, which monitors the temperature of
the module’s metal case. If the case temperature exceeds
a nominal 110°C the converter will shut down. The
converter will automatically restart when the sensed
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 Descrip-
tions’ section of the data sheet for more information 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 voltage.
Below the UVLO threshold the module is off and the
enable control inputs, EN1 and EN2 are inoperative.
Primary-Secondary Isolation
The PT4840 series of DC/DC converters incorporate
electrical isolation between the input terminals (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.
Input Current Limiting
The converter is not internally fused.
For safety and
overall system protection, the maximum input current to
the converter must be limited. Active or passive current
limiting can be used. Passive current limiting can be a
fast acting fuse. A 125-V fuse, rated no more than 10A,
is recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
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PDF描述 |
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| PT5542 | A 25V Single N-Channel HEXFET Power MOSFET in a DirectFET SQ package rated at 59 amperes optimized with low on resistance for applications such as active OR'ing. Shipped in Tape and Reel only. Part is not available in bulk, TR is implied in part number.; Similar to IRF6622 qualified for use with lead free solder shipped in tape and reel 4800 pieces |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4850 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications |
| PT4850F | 制造商:SHARP 制造商全稱:Sharp Electrionic Components 功能描述:Thin Type Phototransistor |
| PT4850FE000F | 功能描述:光電晶體管 PT4800F with IC bin 0.12-0.56mA RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗電流:200 nA 封裝 / 箱體:T-1 |
| PT4851 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications |
| PT4851A | 功能描述:DC/DC轉(zhuǎn)換器 Triple-Output Iso DC-DC Cnvtr RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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