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参数资料
| 型号： | LQN-5/45-D12H |
| 厂商： | CD TECHNOLOGIES INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 6/9页 |
| 文件大小： | 574K |
| 代理商： | LQN-5/45-D12H |
LXN D12 Series
N O N - I S O L A T E D , 4 5 - 5 0 A Q U A R T E R B R I C K , D C / D C C O N V E R T E R S
6
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
(specically 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/sepa-
ration requirements, in compliance with relevant safety-agency speci-
cations (usually UL/IEC/EN60950).
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
control 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 mechani-
cal relay or open-collector/open-drain drive circuit (optically isolated if appro-
priate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
Figure 5. Driving the On/Off Control Pin
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.
ON/OFF pin open: Logic Low = DC/DC converter On
ON/OFF pin >2.8V: Logic High = DC/DC converter Off
Figure 6. Driving The Power-Up With An External Pull-up Resistor
External Input Open: On/Off pin High = DC/DC converter Off
External Input Low:
On/Off pin Low = DC/DC converter On
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
restistor. 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 conguration
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 regula-
tion, 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.
Figure 7. Remote Sense Circuit Conguration
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