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參數(shù)資料
| 型號： | MQHL-28-05D-W-ES |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-12 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 3516K |
| 代理商： | MQHL-28-05D-W-ES |
Product # MQHL-28-05D
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005592 Rev. 2
05/03/10
Page 6
Output:
Current:
±5.0V
10A Total
MQHL-28-05D
Technical Specification
be above 2.0V to be guaranteed to be interpreted as a logic
high. The transition time between the two states should be
less than 300ns.
If the MQHL converter is not to be synchronized, the SYNC
IN pin should be left open circuit.
The converter will
then operate in its free-running mode at a frequency of
approximately 550 kHz.
If, due to a fault, the SYNC IN pin is held in either a logic low
or logic high state continuously, or the SYNC IN frequency
is outside the 500-700 kHz range, the MQHL converter will
revert to its free-running frequency.
The MQHL converter also has a SYNC OUT pin (pin 5). This
output can be used to drive the SYNC IN pins of as many as
ten (10) other MQHL converters. The pulse train coming out
of SYNC OUT has a duty cycle of 50% and a frequency that
matches the switching frequency of the converter with which
it is associated. This frequency is either the free-running
frequency if there is no valid synchronization signal at the
SYNC IN pin, or the synchronization frequency if there is.
The synchronization feature is entirely compatible with that
of SynQor’s MQFL family of converters.
Figure B shows the equivalent circuit looking into the SYNC
IN pin and Figure C shows the equivalent circuit looking into
the SYNC OUT pin.
OUTPUT VOLTAGE TRIM: If desired, it is possible to
increase or decrease the MQHL dual converter’s output
voltage from its nominal value. To increase the output
voltage a resistor, Rup, should be connected between TRIM
pin (pin 10) and the OUTPUT RETURN pin (pin 8), as shown
in Figure E. The value of this resistor should be determined
according to the following equation of from Figure D:
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than
Vnom), and
Rtrim up is in Ohms.
To decrease the output voltage a resistor, Rdown, should be
connected between the TRIM pin and the POSITIVE OUTPUT
pin (pin 7), as shown in Figure E. The value of this resistor
should be determined according to the following equation:
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (less than Vnom),
and
Rtrim down 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.
PIN 2
PIN 6
5K
5V
SYNC IN
IN RTN
TO SYNC
CIRCUITRY
5K
Figure B: Equivalent circuit looking into the SYNC IN pin with
respect to the IN RTN (input return) pin.
FROM SYNC
CIRCUITRY
5K
5V
SYNC OUT
IN RTN
PIN 2
PIN 5
OPEN COLLECTOR
OUTPUT
Figure C: Equivalent circuit looking into SYNC OUT pin with
respect to the IN RTN (input return) pin.
Figure D: Trim up and Trim down as a function of external trim resistance.
10
100
1000
10000
-10% -8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
10%
Output Voltage Adjustment
E
xt
er
na
lT
ri
m
R
es
is
ta
nc
e
(k
O
hm
s)
Trim Up
Trim Down
Rtrim up(Ω) = 6000Ω*Vnom
- 30000Ω
Vout - Vnom
Rtrim down(Ω) = 15100Ω*Vout - 6000Ω*Vnom
- 30000Ω
Vnom - Vout
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