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参数资料
| 型号： | LQN-0.8/50-D12MB |
| 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： | 5/9页 |
| 文件大小： | 609K |
| 代理商： | LQN-0.8/50-D12MB |
LQN D12 Models
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
5
The switching nature of DC/DC converters requires that dc voltage sources
have low ac impedance as highly inductive source impedance can affect
system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus.
Your specic system conguration may necessitate additional considerations.
Minimum Output Loading Requirements
LQN converters employ a synchronous-rectier design topology and all
models regulate within spec and are stable under no-load to full load condi-
tions. Operation under no-load conditions however might slightly increase the
output ripple and noise.
Thermal Shutdown
The LQN converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the temperature of the DC/DC converter to rise
above the designed operating temperature, a precision temperature sensor
will power down the unit. When the internal temperature decreases below the
threshold of the temperature sensor, the unit will self start. See Performance/
Functional Specications.
Output Overvoltage Protection
The LQN output voltage is monitored for an overvoltage condition using a
comparator. The signal is optically coupled to the primary side and if the
output voltage rises to a level which could be damaging to the load, the sens-
ing circuitry will power down the PWM controller causing the output voltage
to decrease. Following a time-out period the PWM will restart, causing the
output voltage to ramp to its appropriate value. If the fault condition persists,
and the output voltage again climbs to excessive levels, the overvoltage
circuitry will initiate another shutdown cycle. This on/off cycling is referred to
as "hiccup" mode.
The LQN Series will withstand higher external sources several volts above
the nominal output. However, if there is a chance of consistent overvoltage,
users should provide an external voltage clamp or other protection.
Figure 4.Trim Connections Using Fixed Resistors
Output Overcurrent Detection
Overloading the power converter's output for an extended time will invariably
cause internal component temperatures to exceed their maximum ratings
and eventually lead to component failure. High-current-carrying components
such as inductors, FET's and diodes are at the highest risk. LQN Series
DC/DC converters incorporate an output overcurrent detection and shutdown
function that serves to protect both the power converter and its load.
If the output current exceeds it maximum rating by typically 40% or if the
output voltage drops to less than 98% of it original value, the LQN's internal
overcurrent-detection circuitry immediately turns off the converter, which then
goes into a "hiccup" mode. While hiccupping, the converter will continuously
attempt to restart itself, go into overcurrent, and then shut down. Under these
conditions, both the average output current and the average input current will
be kept extremely low. Once the output short is removed, the converter will
automatically restart itself.
Output Voltage Trimming
Allowable trim ranges are ±10%. Trimming is accomplished with either a
trimpot or a single xed resistor. The trimpot should be connected between
+Output and Common with its wiper connected to the Trim pin as shown in
Figure 3 below.
A trimpot can be used to determine the value of a single xed resistor
which can then be connected, as shown in Figure 4, between the Trim pin
Figure 3.Trim Connections Using a Trimpot
Note:
Install either a xed
trim-up resistor
or a xed trim-down
resistor depending upon
desired output voltage.
and +Output to trim down the output voltage, or between the Trim pin and
Common to trim up the output voltage. Fixed resistors should have absolute
TCR’s less than 100ppm/
°C to ensure stability.
The equations below can be used as starting points for selecting specic trim-
resistor values. Recall, untrimmed devices are guaranteed to be ±1% accurate.
Adjustment beyond the specied adjustment range is not recommended. If trim
is not desired, leave the Trim pin open.
Trim Equations
Note: Resistor values are in k
. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VO
NOM = nominal output voltage.
Note: LQN-0.8/50-D12 is not trimmable.
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