The power supply has a great impact on the stability of the system. A power supply module with poor quality and
stability will not only cause instability in the system operation, but will also cause serious damage to the components.
The advantage of choosing a DC/DC power supply module with high stability is that it can reduce the time
required for R&D personnel to design, so that the R&D personnel can focus on their own product area, so that
the product can reach the optimum, shorten the product development and verification time, so that the product
can be quickly marketed, and get the leading and winning business opportunities in the market.
1. Efficiency.
In the era of global promotion of high efficiency and energy saving, efficiency is an important factor in the selection
of models, which can reduce energy loss in the process of power conversion, reduce heat treatment problems and
can increase the life of the module, so in the selection of efficiency, the higher the better.
In some applications, the system operates in standby mode for a longer period of time, so a power module with
lower standby loss is a good choice; Boulder's new series products are specially processed and designed to
significantly reduce the standby power loss and improve the overall efficiency under different load conditions,
in line with the latest Energy-saving requirements.
2. Operating temperature.
General temperature operation can be divided into commercial standard (0℃~+60℃), industrial standard
(-25℃~+71℃), military standard (-55℃~+85℃), etc. When selecting a DC/DC power supply module, you need to
consider the actual system operating temperature range and choose the appropriate temperature level.
Different temperature levels will affect the design and selection of materials used in the power supply module, the
selection of a suitable temperature level is a very important consideration, which will affect the stability and
reliability of the DC/DC power supply module, if the system operating temperature exceeds the range of use of the
DC/DC power supply module, serious failure of the module will result, if the product is operated in the temperature
range limit, it is necessary to reduce the use of load, or To ensure the stability of the product, appropriate thermal
design, such as increasing the convection wind speed or increasing the heat sink; BODA provides a variety of
corresponding thermal modules, for related information, please call BODA's agent in China Shenzhen Zhongdian
Huaxing Electronic Technology Co.
3. Input voltage.
Input voltage refers to the range of DC/DC power supply module can operate normally, generally more common
power supply system, usually divided into 5V, 12V, 24V, 48V in the selection of power supply module input voltage
range, depending on the range of input voltage changes, the industry has two times the voltage input and four time
s the voltage input can be selected.
When choosing the input voltage, you need to pay attention to the voltage provided by the front-end power supply
, whether the amount of change in the voltage range within which the DC/DC power module can operate, so the
choice of two times the voltage input or four times the voltage input power module, depending on the front-end
power supply voltage change and stability. Too high or too low input voltage may cause the DC/DC power supply
module to operate improperly or be damaged, so special attention must be paid to this point.
In addition, the actual application, the voltage provided by the general industrial products are mostly 12V and 24V,
the communication products are 24V and 48V, and the railway parts are mostly used 24V, 36V, 48V, 72V, 96V and
110V, Boulder provides a variety of professional application products and product selection manuals including
industrial control, communication, railway...etc., so that customers can choose the type and prepare materials more
easily. 4. Power rating: 4.
4. rated power.
It is generally recommended that the actual power used by the user should be 7~8% of the rated power, under this
principle, the DC/DC power supply module has better performance, longer life and more efficient.
If the rated power of the DC/DC power module selected is much higher than the actual power used, although the
performance and life are helpful, it will be more wasteful in terms of cost considerations; if the actual power used is
larger than the rated power of the DC/DC power module, this is of course an unreasonable design, a short period
of overload operation is not a problem, but a long period of operation in the case of overload, which has an impact
on the life of the product. This has an impact on the life of the product. In terms of BODA products, although most
of them have 110%~180% overload protection design, but still need to avoid overload operation. 5.
5. Operating frequency.
DC/DC power module operating frequency is inversely proportional to the volume of the module, but is directly
proportional to the loss, usually the higher the frequency, DC/DC power module volume can be reduced, but the
conversion efficiency will be reduced; conversely, the volume is larger, but the conversion efficiency increased.
The working frequency of the power module is divided into two forms, one is fixed frequency, the other is
frequency conversion.
Fixed frequency DC/DC power supply module, its operating frequency is mostly designed in the range of
150K ~ 500K Hz, the frequency error is usually within +-10%, ex. 250KHZ +-10%.
Variable frequency DC/DC power supply module, its frequency will change with different input voltage and load
conditions.
Use of low-power products, frequency design is a good choice, fixed frequency and frequency advantages and
disadvantages depend on the actual application of customers, in general, fixed frequency products in dealing with
EMI will be easier.
6. isolation (Isolation).
General power supply is located on the primary side of the product need to have the function of isolation, isolation
in addition to improve the safety and reliability of the system, and can improve the EMC characteristics and
protection of the secondary side.
In terms of DC/DC power modules, the Isolation voltage is mostly required to be 1500V, while all Boulder products
can reach 1600V; in addition to 1600V, there are standard products with 2250V, 3000V or higher Isolation to
choose from, and they are certified by UL, TUV, CE ......, etc. If higher isolation voltage is required, Boulder will
provide customized service to meet customers' needs.
7. voltage regulation (Regulation).
Voltage regulation refers to the stability of the output voltage, the main influencing factors are input voltage and
output load, the stability of the input voltage change (LineRegulation) refers to the relative change in output
voltage when the input voltage changes; Load Regulation refers to the stability of the output voltage when the
load changes; when using unregulated products, when When using unregulated products, when different input
voltage or load conditions, will lead to unstable output voltage, will also lead to system instability, and even cause
damage to the back-end parts, Boda except for 1W micro-power power products, other products have good
voltage stabilization function.
8. safety standards: when designing products need to consider EMI to meet international standards, so you must
choose to meet EMI regulations power supply module, and meet the EMI products DC/DC power supply module
used inside the filter component material selection requirements are relatively higher, the cost will also be higher,
all standard products are certified by safety regulations, can save customers to send test time, custom products are
sent to test according to customer demand, can be in line with All standard products are certified by safety
regulations, which can save customers' time to send testing.
Power supply size: The external size of DC/DC power supply module varies depending on the design of each
company, so users should pay attention to the following points when choosing the required external size.
A. International standard footprint to choose: so that you do not have to worry about the product is limited to
one or two suppliers, the general appearance of the size and output footprint design can be compatible with the
major manufacturers.
B. The same size of the expansion: the product design, providing the same size but different power, the use of
DC/DC power module, if faced with the system needs to upgrade the power supply part of the increase in demand,
if you choose DC/DC power module has the same appearance size and footprint can be selected, so that the
system can save the time and cost of PCBRe-layout, but also make the product can have more This can save the
system PCBRe-layout time and cost, and make the product more flexible.