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參數(shù)資料
| 型號： | PT4413N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 100-Watt 48-V Input Isolated DC/DC Converter |
| 中文描述： | 100瓦48 - V輸入隔離DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 243K |
| 代理商： | PT4413N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4400/4410 Series
Operating Features and System Considerations for
the PT4400/PT4410 Series of DC/DC Converters
Over-Current Protection
To protect against load faults these converters incorporate
output over-current protection. Applying a load to the
output that exceeds the converter’s over-current threshold
(see applicable specification) will cause the output voltage
to momentarily fold back, and then shut down. Following
shutdown the module will periodically attempt to auto-
matically recover by initiating a soft-start power-up.
This is often described as a “hiccup” mode of operation,
whereby the module continues in the cycle of successive
shutdown and power up until the load fault is removed.
Once the fault is removed, the converter automatically
recovers and returns to normal operation.
Output Over-Voltage Protection
Each converter incorporates protection circuitry that
continually senses for an output overvoltage (OV) condi-
tion. The O V threshold automatically tracks the VID
output voltage program setting to a level that is 25 %
higher than that programmed at the control pins, VID0
through VID4. If the converter output voltage exceeds
this threshold, the converter is immediately shut down
and remains in a latched-off state. To resume normal
operation the converter must be actively reset. This can
only be done by momentarily removing the input power
to the converter. For failsafe operation and redundancy,
the O V protection uses circuitry that is independent of
the converter’s internal feedback loop.
Over-Temperature Protection
Over-temperature protection is provided by an internal
temperature sensor, which closely monitors the tempera-
ture of the converter’s metal case. If the case temperature
exceeds a nominal 115 °C, the converter will shut down.
The converter will then automatically restart when the
sensed temperature drops back to approximately 105 °C.
When operated outside its recommended thermal derating
envelope (see data sheet SOA curves), the converter will
typcially cycle on and off at intervals from a few seconds
to one or two minutes. This is to ensure that the internal
components are not permanently damaged from exces-
sive thermal stress.
Under-Voltage Lockout
The Under-Voltage Lock-Out (UVLO) is designed to
prevent the operation of the converter until the input
voltage is close to the minimum input voltage. The
converter is held off when the input voltage is below the
UVLO threshold, and turns on when the input voltage
rises above the threshold. This prevents high start-up
current during normal power-up of the converter, and
minimizes the current drain from the input source during
low input voltage conditions. The converter will meet
full specifications when the minimum specified input
voltage is reached. The UVLO circuitry also overrides
the operation of the
Remote On/Off
control. Only when
the input voltage is above the UVLO threshold will
the
Remote On/Off
control be functional.
Primary-Secondary Isolation
These 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. This specification com-
plies 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 data sheet ‘Pin Descriptions’ section provides
guidance as to the correct reference that must be used for
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 10 A,
is recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
Thermal Considerations
Airflow may be necessary to ensure that the module can
supply the desired load current in environments with
elevated ambient temperatures. The required airflow
rate may be determined from the Safe Operating Area
(SOA) thermal derating chart (see converter specifica-
tions). The recommended direction for airflow is into,
or perpendicular to, the longest side of the module’s
metal case. See Figure 1.
Recommended direction for airflow is
into (perpendicular to) the longest side.
Figure 1
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