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| 型號(hào)： | MQHL-28E-15D-Z-C |
| 廠(chǎng)商： | SYNQOR INC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 2-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-12 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 4137K |
| 代理商： | MQHL-28E-15D-Z-C |
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Product # MQHL-28E-15D
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005929 Rev. 2
07/13/11
Page 8
Output:
Current:
±15V
3.3A Total
MQHL-28E-15D
Application Section
To avoid any problems that might arise due to back-drive
current, the MQHL converters limit the negative current
that the converter can draw from its output terminals. The
threshold for this back-drive current limit is placed sufficiently
below zero so that the converter may operate properly
down to zero load, but its absolute value (see the Electrical
Characteristics page) is small compared to the converter’s
rated output current.
CURRENT LIMIT: In the event of excess load, the MQHL
converter will quickly reduce its output voltage to keep
the load current within safe limits (see Figure 12). If the
overload persists for more than 14 milliseconds, the converter
will shut off, wait a restart delay, and then automatically
attempt to re-start. The timeout is internally implemented
with an integrator: counting up whenever current limit is
active, and counting down at 1/5th the rate whenever current
limit becomes inactive. In this way a series of short-duration
overloads will not cause the converter to shut down, while it
will shut down in response to sustained overloads.
When the converter is mounted on a metal plate, the plate
will help to make the converter’s case bottom a uniform
temperature. How well it does so depends on the thickness
of the plate and on the thermal conductance of the interface
layer (e.g. thermal grease, thermal pad, etc.) between
the case and the plate. Unless this is done very well, it
is important not to mistake the plate’s temperature for the
maximum case temperature. It is easy for them to be as much
as 5-10C different at full power and at high temperatures.
It is suggested that a thermocouple be attached directly to
the converter’s case through a small hole in the plate when
investigating how hot the converter is getting. Care must
also be made to ensure that there is not a large thermal
resistance between the thermocouple and the case due to
whatever adhesive might be used to hold the thermocouple
in place.
INPUT SYSTEM INSTABILITY: This condition can occur
because any dc-dc converter appears incrementally as a
negative resistance load. A detailed application note titled
“Input System Instability” is available on the SynQor website
which provides an understanding of why this instability
arises, and shows the preferred solution for correcting it.
THERMAL CONSIDERTAIONS: Figure 11 shows the
suggested Power Derating Curves for this converter as
a function of the case temperature and the maximum
desired power MOSFET junction temperature. All other
components within the converter are cooler than its hottest
MOSFET, which at full power is no more than 20C higher
than the case temperature directly below this MOSFET.
The Mil-HDBK-1547A component derating guideline calls
for a maximum component temperature of 105C. Figure
11 therefore has one power derating curve that ensures
this limit is maintained. It has been SynQor’s extensive
experience that reliable long-term converter operation can
be achieved with a maximum component temperature of
125C. In extreme cases, a maximum temperature of 145C
is permissible, but not recommended for long-term operation
where high reliability is required. Derating curves for these
higher temperature limits are also included in Figure 11. The
maximum case temperature at which the converter should
be operated is 135C.
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