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参数资料
| 型号： | LSN-1.2/10-D5BH |
| 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 |
| 封装： | SIP-9 |
| 文件页数： | 6/11页 |
| 文件大小： | 361K |
| 代理商： | LSN-1.2/10-D5BH |
LSN-10A D5 Series
N O N - I S O L A T E D , 1 0 - 3 3 W S I P D C / D C C O N V E R T E R S
4
+INPUT
COMMON
5k
1.1k
0.75k
ON/OFF
CONTROL
elements and should be selected for bulk capacitance, low ESR, and appro-
priate frequency response. Any scope measurements of PARD should be
made directly at the DC/DC output pins with scope probe ground less than
0.5" in length.
All external capacitors should have appropriate voltage ratings and be located
as close to the converters as possible. Temperature variations for all relevant
parameters should be taken into consideration.
The most effective combination of external I/O capacitors will be a function
of your line voltage and source impedance, as well as your particular load and
layout conditions. Our Applications Engineers can recommend potential solu-
tions and discuss the possibility of our modifying a given device’s internal lter-
ing to meet your specic requirements. Contact our Applications Engineering
Group for additional details.
Input Fusing
Most applications and or safety agencies require the installation of fuses at
the inputs of power conversion components. LSN D5 Series DC/DC convert-
ers are not internally fused. Therefore, if input fusing is mandatory, either a
normal-blow or a slow-blow fuse with a value no greater than 15 Amps should
be installed within the ungrounded input path to the converter.
As a rule of thumb however, we recommend to use a normal-blow or slow-
blow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converters minimum efciency.
Safety Considerations
LSN D5 SIP'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 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.
Input Overvoltage and Reverse-Polarity Protection
LSN D5 SIP Series DC/DC's do not incorporate either input overvoltage or
input reverse-polarity protection. Input voltages in excess of the specied
absolute maximum ratings and input polarity reversals of longer than "instan-
taneous" duration can cause permanent damage to these devices.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specied input voltage
range (4.5 Volts) 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 capacitance, and the slew rate and nal value of
the input voltage as it appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via the
On/Off Control with the nominal input voltage already applied to the converter.
The specication denes the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within its
specied accuracy band. See Typical Performance Curves.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN D5 SIP
Series DC/DC's are designed so they are enabled when the control pin is
left open (internal pull-down to Common) and disabled when the control pin is
pulled high (+2.8V to +VIN), as shown in Figure 2 and 2a.
Dynamic control of the on/off function is best accomplished with a mechanical
relay or open-collector/open-drain drive circuit. The drive circuit should be
able to sink appropriate current when activated and withstand appropriate
voltage when deactivated.
Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
Remote Sense
LSN D5 SIP Series DC/DC converters offer an output sense function on pin 3.
The sense function enables point-of-use regulation for overcoming moderate
The on/off control function, however, can be externally inverted so that the
converter will be disabled while the input voltage is ramping up and then
"released" once the input has stabilized.
IR drops in conductors and/or cabling. Since these are non-isolated devices
whose inputs and outputs usually share the same ground plane, sense is
provided only for the +Output.
The remote sense line is part of the feedback control loop regulating the
DC/DC converter’s output. The sense line carries very little current and
consequently requires a minimal cross-sectional-area conductor. As such, it
is not a low-impedance point and must be treated with care in layout
and cabling. Sense lines should be run adjacent to signals (preferably
ground), and in cable and/or discrete-wiring applications, twisted-pair or
similar techniques should be used. To prevent high frequency voltage differ-
ences 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
Power derating (output current limiting) is based upon maximum output
current and voltage at the converter's output pins. Use of trim and sense
functions can cause the output voltage to increase, thereby increasing output
power beyond the LSN's specied rating. Therefore:
(VOUT at pins) x (IOUT)
≤ rated output power
The internal 10.5
resistor between +Sense and +Output (see Figure 1)
serves to protect the sense function by limiting the output current owing
through the sense line if the main output is disconnected. It also prevents
output voltage runaway if the sense connection is disconnected.
Note: Connect the +Sense pin (pin 3) to +Output (pin 4) at the DC/DC
converter pins, if the sense function is not used for remote regulation.
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