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| 型號： | MQHL-28-2R5S-X-ES |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-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> | 4154K |
| 代理商： | MQHL-28-2R5S-X-ES |
Product # MQHL-28-2R5S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005898 Rev. 1
05/19/11
Page 6
Output:
Current:
2.5V
20A
MQHL-28-2R5S
Application Section
Inside the converter, +SENSE is connected to +Vout with a
100Ω resistor and –SENSE is connected to OUTPUT RETURN
with a 10Ω resistor.
It is also important to note that when remote sense is used,
the voltage across the converter’s output terminals (pins 7
and 8) will be higher than the converter’s nominal output
voltage due to resistive drops along the connecting wires.
This higher voltage at the terminals 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.
SYNCHRONIZATION: The MQHL converter’s switching
frequency can be synchronized to an external frequency
source that is in the 500 kHz to 700 kHz range. A pulse
train at the desired frequency should be applied to the SYNC
IN pin (pin 6) with respect to the INPUT RETURN (pin 2).
This pulse train should have a duty cycle in the 20% to 80%
range. Its low value should be below 0.8V to be guaranteed
to be interpreted as a logic low, and its high value should
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: the TRIM pin (pin 11) can
adjust the MQHL converter’s output voltage ±10% around its
nominal value.
To trim the output voltage above its nominal value, connect
an external resistor from the TRIM pin to the –SENSE pin
as shown in Figure D. The value of this trim up resistor
should be chosen according to the following equation or
from Figure E:
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.
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than
Vnom), and
Rtrim up 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.
To trim the output voltage below its nominal value, connect
an external resistor between the TRIM pin and the +SENSE
pin. The value of this trim down resistor should be chosen
according to the following equation or from Figure E:
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (less than Vnom),
and
Rtrim down is in Ohms.
Factory trimmed converters are available by request.
Rtrim up(Ω) = 6100Ω*Vnom
- 30000Ω
Vout - Vnom
Rtrim down(Ω) = 15400Ω*Vout - 6100Ω*Vnom
- 30000Ω
Vnom - Vout
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