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參數(shù)資料
| 型號(hào)： | MQFL-28-15D-W-ES |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 120 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-12 |
| 文件頁(yè)數(shù)： | 6/18頁(yè) |
| 文件大小： | 711K |
| 代理商： | MQFL-28-15D-W-ES |
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Product # MQFL-28-15D
Phone 1-888-567-9596
Doc.# 005-2MQ150D Rev. A
10/23/07
Page 14
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Output:
Current:
±
±15 V
15 V
8 A Total
MQFL-28-15D
INPUT OVER-VOLTAGE SHUTDOWN: The MQFL converter
also has an over-voltage feature that ensures the converter will be
off if the input voltage is too high. It also has a hysteresis and
time delay to ensure proper operation.
SHUT DOWN: The MQFL converter will shut down in response
to only four conditions: ENA1 input low, ENA2 input low, VIN
input below under-voltage lockout threshold, or VIN input above
over-voltage shutdown threshold. Following a shutdown event,
there is a startup inhibit delay which will prevent the converter
from restarting for approximately 300ms. After the 300ms delay
elapses, if the enable inputs are high and the input voltage is
within the operating range, the converter will restart. If the VIN
input is brought down to nearly 0V and back into the operating
range, there is no startup inhibit, and the output voltage will rise
according to the "Turn-On Delay, Rising Vin" specification.
BACK-DRIVE CURRENT LIMIT: Converters that use MOSFETs
as synchronous rectifiers are capable of drawing a negative cur-
rent from the load if the load is a source of short- or long-term
energy. This negative current is referred to as a “back-drive cur-
rent”.
Conditions where back-drive current might occur include paral-
leled converters that do not employ current sharing, or where the
current share feature does not adequately ensure sharing during
the startup or shutdown transitions. It can also occur when con-
verters having different output voltages are connected together
through either explicit or parasitic diodes that, while normally off,
become conductive during startup or shutdown. Finally, some
loads, such as motors, can return energy to their power rail.
Even a load capacitor is a source of back-drive energy for some
period of time during a shutdown transient.
To avoid any problems that might arise due to back-drive current,
the MQFL 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.
THERMAL CONSIDERATIONS: Figure 11 shows the suggest-
ed Power Derating Curves for this converter as a function of the
case temperature and the maximum desired power MOSFET junc-
tion 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 main-
tained. 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 con-
verter should be operated is 135C.
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 ther-
mal 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MQFL-28E-05S-W-ES | 1-OUTPUT 120 W DC-DC REG PWR SUPPLY MODULE |
| MQFL-28E-12S-Y-C | 1-OUTPUT 120 W DC-DC REG PWR SUPPLY MODULE |
| MQHL-28-05D-W-ES | 2-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| MQHL-28-2R5S-X-ES | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| MQHL-28E-15D-Z-C | 2-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MQFL-28-15D-Y-ES | 制造商:SYNQOR 制造商全稱:SYNQOR 功能描述:HIIGH RELLIIABIILLIITTY DC/DC CONVERTTER |
| MQFL-28-15S | 制造商:SYNQOR 制造商全稱:SYNQOR 功能描述:HIIGH RELLIIABIILLIITTY DC/DC CONVERTTER |
| MQFL-28-1R5S | 制造商:SYNQOR 制造商全稱:SYNQOR 功能描述:HIGH RELIABILITY DC-DC CONVERTER |
| MQFL-28-1R5S-Y-ES | 制造商:SYNQOR 制造商全稱:SYNQOR 功能描述:HIGH RELIABILITY DC-DC CONVERTER |
| MQFL-28-1R8S | 制造商:SYNQOR 制造商全稱:SYNQOR 功能描述:HIGH RELIABILITY DC-DC CONVERTER |
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