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参数资料
| 型号： | QME48T20120-NGA0 |
| 厂商： | Power-One |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | DC/DC QUARTER BRICK 12V OUT |
| 标准包装： | 10 |
| 系列： | * |
QME48T20120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 20 A Output
Data Sheet
Operations
Input and Output Impedance
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
The addition of a 100 μF electrolytic capacitor with
an ESR < 1 ? across the input helps to ensure
stability of the converter. In many applications, the
user has to use decoupling capacitance at the load.
ON/OFF input, in which case it must be capable of
sourcing or sinking up to 1 mA depending on the
signal polarity. See the Startup Information section
for system timing waveforms associated with use of
the ON/OFF pin.
Remote Sense (Pins 5 and 7)
The remote sense feature of the converter
compensates for voltage drops occurring between
the output pins of the converter and the load. The
SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should
be connected at the load or at the point where
regulation is required (see Fig. B).
The power converter will exhibit stable operation with
external load capacitance up to 2,200 μF on 12 V
output.
Vin (+)
QME Series
Converter
(Top View)
Vout (+)
100
SENSE (+)
Rw
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
10
Vout (+)
Rw
Rload
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. There are two
remote control options available, positive and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
Fig. B: Remote sense circuit configuration.
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin
must be connected to the Vout(+) pin (Pin 8) to ensure the
converter will regulate at the specified output voltage. If these
connections are not made, the converter will deliver an
Vin (+)
QME Series
Converter
(Top View)
Vout (+)
SENSE (+)
output voltage that is slightly higher than the specified data
sheet value.
Vin
CONTROL
INPUT
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
Rload
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
system noise and ensure optimum performance.
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF
pin is at a logic high and turns off when at a logic
low. The converter is on when the ON/OFF pin is left
open. See the Electrical Specifications for logic
high/low definitions.
The negative logic version turns on when the pin is
at a logic low and turns off when the pin is at a logic
high. The ON/OFF pin can be hardwired directly to
Vin(-) to enable automatic power up of the converter
without the need of an external control signal.
The ON/OFF pin is internally pulled up to 5 V
through a resistor. A properly debounced mechanical
switch, open-collector transistor, or FET can be used
to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2 mA at a low
level voltage of ? 0.8 V. An external voltage source
(±20 V maximum) may be connected directly to the
The converter’s output overvoltage protection (OVP)
senses the voltage across Vout(+) and Vout(-), and
not across the sense lines, so the resistance (and
resulting voltage drop) between the output pins of
the converter and the load should be minimized to
prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, decrease the maximum
current (originally obtained from the derating curves)
ZD-01742 Rev 3.4, 21-Jan-10
www.power-one.com
Page 4 of 14
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