FAQ

If users connect the power supply to motors, light bulbs, or high capacitive loads, which mean users required a higher output inrush current when you turn on the power supply. And such higher inrush current will cause failure of start up. We recommend that users use the power supply with constant current limiting protection to deal with these loads.

GND(GROUND) means it connect to earth ground. SUNPOWER’s products marked below: Single output：positive pole(+V)，negative pole(-V) Multi output：According to channels (V1,V2,V3………), ground(GND) Isolation output：According to channel V1.G1 and V2.G2………

 In order to increase the life time of the switching power supply, we recommend users to choose a model which has rated output 25% more than actual need. For example, if a system required a power supply for 200W, we recommend the users to choose a power supply that has 250W rated power. This is to increase the life time and reliability of power supply. 1. Please make sure the power source is 115V or 230V, if your system sell to all over the world, we recommend users choose some type with universal input(115~230V) or 115V/230V Auto sensing. It will fit all over the world. 2. To estimate the working temperature of Power Supply, and extra forced cooling equipments. When a power supply works at higher temperature environmental, it needs to lower the output power requirement. About the curve changes between the temperature ambience & rated output power load, please refer to the product specification. 3. Read the specification of your power supply to understand all functions and the size that fit your requirement. 4. According to your applying conditions may choose the protection function you required: 5. Protection function: over voltage protection(OVP)、over load protection (OLP)、over current protection(OCP)、over temperature protection(OTP) , etc… 6. Application function : signal function(POWER GOOD 、 POWER FAIL)、remote control On/Off function、remote sense function、output in parallel function , etc… 7. Special function: power factor correction (PFC) 8. Make sure that the model qualifies for the safety standards and EMC regulations you need.

There are two possible reasons that will cause the power supply to shutdown. The first one is over load that trigger the activation of the over-load-protection (OLP). To solve this problem, we recommend choosing other type of power supply with higher output power or using some type of power supply with peak load over protection. The second one is the activation of over-temperature protection (OTP) when the internal temperature rises too high. Please check the cooling of the power supply is well. The two conditions describe will let the power supply enter protection mode and shut down. After these conditions are removed, the power supply will be back to normal.

During safety verification process, the agency will use a stricter standard ±10%(IEC60950 uses +6%, -10%) of the input voltage range labeled on the power supply to conduct the test. So, operating at the wider input voltage range as specified on the spec. sheet should be fine. The narrower range of input voltage labeled on the power supply is to fulfill the test standard of safety regulation and make sure that users insert input voltage correctly.

Most small wattage and fanless power supplies are mainly installed in the horizontal position. If you have to install it vertically because of mechanical limitation, you should consider the output derating due to the heat concern. The temperature derating curve can be found on the spec sheet. Regarding the power supplies with built-in fan or the application has forced cooling system, vertical and horizontal installations have less difference. Ex. In SP-150 derating curve, the ambient temperature difference in application is 5 Celsius from vertical to horizontal. The output wattage in forced cooling can be 20% higher than air cooling convection.

Lighting system designed to work in direct drive mode The combined LED forward voltage range (upper and lower) must fall within LED power supply’s constant current voltage range. For example, the LED Vf spec is 3.4~3.6V, when 6 are connected in series the combined Vf will be 20.4~21.6V. In this case, a 24V unit must be selected with constant current region of 18~24V.Ø For models with active PFC and system PF requirement is >0.9, load usage must be higher than as specified in the PFC spec. Relationship between PF and output load can be found in figure 1. The typical requirement is 75% load or above. Double check the spec for the model you are using to confirm actual requirement. In areas with unstable AC voltage such as heavy industrial zone or generator supply utility, please select general usage LED series from table 1. Lighting system designed to work with driver IC The start up voltage of driver IC should be as close to the power supply rated voltage as possible. Driver IC needs stable voltage to function properly. So, it is highly recommended to use general usage series from table 1. For models with active PFC and system PF requirement is >0.9, load usage must be higher than as specified in the PFC spec. Relationship between PF and output load can be found in figure 1. The typical requirement is 75% load or above. Double check the spec for the model you are using to confirm actual requirement. When using driver IC, possible system EMI issue could arise. After completing lighting system design, EMI must be double checked. For suggestion on system EMI problem solving, refer to question 11.

During safety verification process, the agency will use a stricter standard ±10%(IEC60950 uses +6%, -10%) of the input voltage range labeled on the power supply to conduct the test. So, operating at the wider input voltage range as specified on the spec. sheet should be fine. The narrower range of input voltage labeled on the power supply is to fulfill the test standard of safety regulation and make sure that users insert input voltage correctly.

At input side, there will be (1/2 ~1 cycle, ex. 1/120 ~ 1/60 seconds for 60 Hz AC source) large pulse current (20~100A based on the design of S.P.S.) at the moment of power on and then back to normal rating. This