The CCM250 range of single output AC-DC 250W nominal, 300W peak power supplies feature industry leading efficiency of 95% and absolute minimum efficiency of 90% with 90VAC input and full load. This leap in efficiency has been achieved with full resonant ZCS topology and careful consideration to every aspect of power loss resulting in a convection cooled power supply packaged in a 6" (153mm) x 4" (102mm) x 1.5" (38mm) chassis which can be easily installed into the end application due to a 70% reduction in the dissipated heat, associated with other power supplies in this power range.
The six standard models cover the voltage range from 12V - 48V, have dual input fusing and are compliant with IEC60601-1 Medical and IEC60950-1 IT safety approvals.
The CCM250 series also boasts low earth leakage current of typically 90uA at 115V and 160uA at 230V, class B conducted and radiated emissions 5V standby rail, power fail signal and remote on/off.
Features:
- 250W Convection
- 300W Peak Rating
- Very high efficiency up to 95%
- Class B Conducted and Radiated Emissions
- 1U Form Factor
- 5V standby rail
- 80-275VAC Input Operation
- IT, Industrial, and Medical Safety Approvals
- Remote On/Off & Power Fail Signal as standard
With the convection cooled rating customers are able to design their system without the need of dedicated air flow cooling over the power supply. This could allow the customer to completely remove fans from their system substantially reducing system audible noise and improving overall reliability.
The industry leading efficiency that the CCM250 offers allows customers to drastically reduce the heat created by the supply in their system. The reduction in heat that the CCM250 will provide improved reliability, smaller systems, and simpler system designs.
From the graph above we can see that the CCM250 operating at a roughly 93% efficiency will create less than half of the amount of heat of a standard product in this wattage range. This is a savings of over 25W of heat in the system!!
With the supply meeting both Class B conducted and radiated emissions the customer has the option of using a plastic enclosure without expensive AC filters or spray on sheilding on the enclosure. This is a large benefit in competitive applications such as patient monitoring equipment where Class B emissions are a key requirement.
A nice benefit of the ZCS (Zero Current Switching) topology that is used for the efficiency boost is that of the reduced electronic noise that is created. We've just discussed the Class B emissions that the unit has, but the unit is also very quiet on the output side where the performance well exceeds the specification of 1% ripple and noise. The plot below shows ripple and noise of only 84mV on a 24V output.
This benefit allows for reduced filtering needs on the DC side of the customers system saving board real estate and component count.
With any convection cooled application it is very important to ensure that the power supply is being operated within it's thermal specifications. Often with convection applications there can be hot spots in the system that the engineer doesn't anticipate due to the air not being able to freely circulate within the system. A standard derating curve is an acceptable way to provide a guideline for whether the supply will handle the power draws within a customer application or not.
However, since each system application is different, a far better way is to monitor some key components on the supply with thermal couples while the system is being tested to ensure that the system specifications are not exceeding the abilities of the supply. This helps to remove any variables from consideration such as hot pockets in the system, higher current draws than anticipated, etc. It also allows for varaitions in how the supply is situated within the system. Because the CCM250 is a U-channel type of a power supply there will be some benefit of conduction cooling from the U-channel being mounted to a large metal surface. However, this is NOT a requirement and is only an unspecified benefit that may be seen through system thermal testing. Also, sometimes the customer may need to mount the supply on it's side, or vertically, and monitoring the components just helps to ensure that each unique system design is acceptable to the ratings of the supply.
The CCM250 is an industry leading power supply and has many features and beneifts not outlined in this brief introduction. We invite you to learn more about it from our website at www.xppower.com, or by contacting one of our sales offices and discussing it with a Sales person or Applications Engineer. You can also feel free to provide comments at the end of this article or ask one of our Experts here on the Element 14 website.
 | LF_CCM250_220609.pdf |
 | SF_CCM250_060509.pdf |