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| 型號(hào)： | MQFL-28E-12S-Y-C |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 120 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-12 |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大?。?/td> | 1050K |
| 代理商： | MQFL-28E-12S-Y-C |
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Product # MQFL-28E-12S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005104 Rev. A
07/28/09
Page 11
Output:
Current:
12V
10A
MQFL-28E-12S
Technical Specification
Since the SHARE pin is monitored with respect to the OUTPUT
RETURN (pin 8) by each converter, it is important to connect all of
the converters’ OUTPUT RETURN pins together through a low DC
and AC impedance. When this is done correctly, the converters
will deliver their appropriate fraction of the total load current to
within +/- 10% at full rated load.
Whether or not converters are paralleled, the voltage at the
SHARE pin could be used to monitor the approximate average
current delivered by the converter(s). A nominal voltage of 1.0V
represents zero current and a nominal voltage of 2.2V represents
the maximum rated current, with a linear relationship in between.
The internal source resistance of a converter’s SHARE pin signal
is 2.5 kW. During an input voltage fault or primary disable
event, the SHARE pin outputs a power failure warning pulse. The
SHARE pin will go to 3V for approximately 14ms as the output
voltage falls.
NOTE: Converters operating from separate input filters with
reverse polarity protection (such as the MQME-28-T filter) with
their outputs connected in parallel may exhibit hiccup operation
at light loads. Consult factory for details.
OUTPUT VOLTAGE TRIM: If desired, it is possible to increase
the MQFL converter’s output voltage above its nominal value. To
do this, use the +SENSE pin (pin 10) for this trim function instead
of for its normal remote sense function, as shown in Figure D.
In this case, a resistor connects the +SENSE pin to the –SENSE
pin (which should still be connected to the output return, either
remotely or locally). The value of the trim resistor should be
chosen according to the following equation or from Figure E:
Rtrim = 100 x
Vnom
[Vout–Vnom–0.025]
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than Vnom), and
Rtrim is in Ohms.
As the output voltage is trimmed up, it produces a greater voltage
stress on the converter’s internal components and may cause the
converter to fail to deliver the desired output voltage at the low
end of the input voltage range at the higher end of the load
current and temperature range. Please consult the factory for
details. Factory trimmed converters are available by request.
INPUT UNDER-VOLTAGE LOCKOUT: The MQFL converter
has an under-voltage lockout feature that ensures the converter
will be off if the input voltage is too low. The threshold of
input voltage at which the converter will turn on is higher that
the threshold at which it will turn off. In addition, the MQFL
converter will not respond to a state of the input voltage unless
it has remained in that state for more than about 200s. This
hysteresis and the delay ensure proper operation when the source
impedance is high or in a noisy environment.
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.
Figure D:
Typical connection for output voltage trimming.
28 Vdc
Load
+VIN
IN RTN
CASE
ENA 1
SYNC OUT
SYNC IN
ENA 2
SHARE
+ SNS
– SNS
OUT RTN
+VOUT
1
2
3
4
5
6
12
11
10
9
8
7
open
means
on
Rtrim
+
–
+
–
Figure E:
Output Voltage Trim Graph
100
1,000
10,000
100,000
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Increase in Vout (V)
T
r
im
R
e
s
is
ta
n
c
e
(o
h
m
s
)
BACK-DRIVE CURRENT LIMIT: Converters that use MOSFETs
as synchronous rectifiers are capable of drawing a negative current
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 current”.
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 con-
verter 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 5 shows the suggested
Power Derating Curves for this converter as a function of the
case temperature, input voltage and the maximum desired power
MOSFET junction temperature. All other components within the
converter are cooler than its hottest MOSFET.
The Mil-HDBK-1547A component derating guideline calls for a
maximum component temperature of 105C. Figure 5 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 5. The maximum case temperature at which the converter
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 thermal resistance
between the thermocouple and the case due to whatever adhe-
sive 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.
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