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参数资料
| 型号： | LQN-0.8/50-D12H |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-10 |
| 文件页数： | 12/14页 |
| 文件大小： | 1683K |
| 代理商： | LQN-0.8/50-D12H |
ON/OFF pin open: Logic Low = DC/DC converter On
ON/OFF pin >2.8V: Logic High = DC/DC converter Off
Figure 5. Driving the On/Off Control Pin
External Input Open: On/Off pin High = DC/DC converter Off
External Input Low: On/Off pin Low = DC/DC converter On
Figure 6. Driving The Power-Up With An External Pull-up Resistor
The trim equations above can be used as starting points for selecting
specific trim-resistor values. Recall, untrimmed devices are guaranteed to be
±1% accurate.
Adjustment beyond the specified adjustment range is not recommended. If
trim is not desired, leave the Trim pin open.
Return Current Paths
The LQN D12 are non-isolated DC/DC converters. Their Common pins (pins 1,
6 and 8) are connected to each other internally (see Figure 1). To the extent
possible (with the intent of minimizing ground loops), input return current
should be directed through pin 1 (also referred to as –Input or Input Return),
and output return current should be directed through pin 6 and 8 (also referred
to as –Output or Output Return). Any on/off control signals applied to pin 4
(On/Off Control) should be referenced to Common (specifically pin 1).
Safety Considerations
LQN D12's are non-isolated DC/DC converters. In general, all DC/DC's must
be installed, including considerations for I/O voltages and spacing/separation
requirements, in compliance with relevant safety-agency specifications (usually
UL/IEC/EN60950-1).
In particular, for a non-isolated converter's output voltage to meet SELV
(safety extra low voltage) requirements, its input must be SELV compliant. If the
output needs to be ELV (extra low voltage), the input must be ELV.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. LQN D12
Series DC/DC converters are designed so that they are enabled when the con-
trol pin is left open (or pulled low to 0 to +0.4V) and disabled when the control
pin is pulled high (+2.8V to +VIN). As shown in Figure 5, all models have an
internal 20k pull-down resistor to Common (ground).
Dynamic control of the on/off function is best accomplished with a
mechanical relay or open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
The on/off control can be driven using a circuit comparable to that shown in
Figure 5. Leaving the On/Off control pin open or applying a voltage between
0V and +0.4V will turn on the converter. Applied voltages between +2.8V and
+VIN will disable the converter.
Power-up sequencing
If a controlled start-up of one or more LQN D12 Series DC/DC converters
is required, or if several output voltages need to be powered-up in a given
sequence, the On/Off control pin can be pulled high to +VIN with an external
5.6k
resistor. While input voltage and/or other converters are ramping up,
the control pin is pulled high and the converter remains disabled. To enable
the output voltage, the control pin needs to be pulled low in the configuration
shown in Figure 6.
Remote Sense
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation
the user should connect the +Sense to +VOUT at the DC/DC converter pins.
LQN series converters employ a sense feature to provide point of use regu-
lation, thereby overcoming moderate IR drops in pcb conductors or cabling.
The remote sense line carries very little current and therefore require minimal
cross-sectional-area conductors. As such, they are not low impedance points
and must be treated with care in layouts and cabling. Sense lines on a pcb
should be run adjacent to dc signals, preferably ground. In cables and discrete
wiring applications, twisted pair or other techniques should be implemented.
To prevent high frequency voltage differences between Vout and Sense, we
recommend installation of a 1000pF capacitor close to the converter.
The sense function is capable of compensating for voltage drops between
the +Output and +Sense pins that do not exceed 10% of Vout.
[Vout(+) – Common] – [Sense(+) – Common] ≤ 10%Vout
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
MDC_LQN D12 Models.B03 Page 7 of 14
LQN D12 Models
Non-Isolated, Single Output, 12Vin, 0.8-5Vout
45-50 Amp, -Brick, DC/DC Converters
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