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参数资料
| 型号： | LQN-1/50-D12MB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 50.75 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/9页 |
| 文件大小： | 609K |
| 代理商： | LQN-1/50-D12MB |
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
4
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL LQN series DC/DC converters, we recommend
the use of a time delay fuse, installed in the ungrounded input supply line,
with a value no greater than the following:
Model
Fuse Value
LQN-1/50-D12
12.5 Amps
LQN-1.8/50-D12
15 Amps
LQN-2.5/45-D12
25 Amps
LQN-3.3/45-D12
30 Amps
As a rule of thumb however, we recommend the use of a normal-blow or
slow-blow fuse with a typical value about twice the maximum input current,
calculated at low line with the converter's minimum efciency.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the con-
verters must be installed in compliance with the requirements of the end-use
safety standard, i.e. IEC/EN/UL60950.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropiately fused, it
could cause permanent damage to the converter.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specied accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and nal value of the input voltage as it appears at
the converter. The LQN Series implements a soft start circuit to limit the duty
cycle of its PWM controller at power up, thereby limiting the input inrush current.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specication denes the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specied accuracy band.
Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is
also governed by the internal soft start circuitry and external load capaci-
tance. The difference in start up time from VIN to VOUT and from On/Off
Control to VOUT is therefore insignicant.
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below
the Undervoltage Shutdown limit. Subsequent re-start will not occur until the
input is brought back up to the Start-Up Threshold. This built in hysteresis
prevents any unstable on/off situations from occurring at a single input voltage.
Input Overvoltage Shutdown
All LQN DC/DC's are equipped with input overvoltage protection. Input
voltages exceeding the input overvoltage shutdown specication listed in the
Performance/Functional Specications will cause the device to shut down.
A built-in hysterisis for all models will not allow the converter to restart until
the input voltage is sufciently reduced.
Input Source Impedance
The input of LQN converters must be driven from a low ac-impedance
source. The DC/DC's performance and stability can be compromised by the
use of highly inductive source impedances. The input circuit shown in Figure
2 is a practical solution that can be used to minimize the effects of induc-
tance in the input traces. For optimum performance, components should be
mounted close to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All LQN Series models are tested/specied for input reected ripple current
and output noise using the specied external input/output components/cir-
cuits and layout as shown in the following two gures. External input capaci-
tors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing
line voltage variations caused by transient IR drops in conductors from
backplane to the DC/DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings.
T E C H N I C A L N O T E S
Figure 2. Measuring Input Ripple Current
Absolute Maximum Ratings
Input Voltage
Continuous or Transient
15.5 Volts maximum
On/Off Control (pin 4)
+VIN maximum
Input Reverse Polarity Protection
See Fuse section
Output Overvoltage Protection
VOUT +20% maximum
Output Current
Current-limited (See note 7).
Devices can withstand
sustained short circuit without
damage.
Storage Temperature
–55 to +125°C.
Lead Temperature (soldering 10 sec. max.)
+300°C. Refer to solder prole.
Absolute maximums are stress ratings. Exposure of devices to any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specications Table is not implied nor recommended.
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