300w 24v dc power supply led transformer

300w 24v power supply led transformer 1. 85~264VAC by switch 2. protections overload/short circuit, convection cooling 3. UL

300w 24v dc power supply led transformer with CE Rohs UL ETS EMC

1. Specification of UN300W-S-24:

DC output: 24V 12.5A load regulation: 0.5%ripple&noise: 120mV efficiency(Typ.): 85%                    AC input voltage range        85~264VAC selected by switchinput frequency               47~63HzInrush current                cold start,20A/115V,40A/230Vinput leakage current        <0.7mA/230VACLine regulation(full load)     <=+-0.5%Output voltage adjust range     +-10%Output overload protection      110~150%Output over voltage protection     115~150%Withstand voltage               I/P -O/P:3.0KVAC/1min     I/P -F/G:1.5KVAC/1min    O/P-F/G:0.5KVAC/1minRise time                       50ms@full load(typical)Hold up time                    20ms@full load(typical)Operating temp.& humidity       -10°C~+50°C,20%~93%RH(non condensing)Storage temp.&humidity           -20°C~+85°C, 20%~95%RH(non condensing)Safety standards                    GB4943,UL60950,EN60950EMC standards                  GB9254,EN55022 class B, EN55024  EN61000-3-2,3, en61000-4-2,3,4,5,6,8,11Cooling method                convectionUniversal AC input/full rangeProtection: overload/ over voltage/ short circuitapprovals: UL, EN55022 100% full load burn-in testhigh reliability2 years warrantysize:     199x110x50(mm)

2  Dimensional drawings:

     

3. The partial enlarged detail:

  

4. Technical Instructions::

1. Input voltage: Normally, power supplies with AC input can also be applied to DC input. The DC input voltage range shall be 120- 370VDC when the AC input voltage range is 85-264VAC; and 210-370VDC when the AC input voltage range is 170-264VAC, or 85-132VAC/170-264VAC selected by switch.

2. Input inrush current: is the maximum peak current when cold start of the power supply.

3. Multi-output power supplies: For power supplies with multi-output, in our catalog it shows the maximum output current of each output. But the total power of all outputs shall be within the rated power of the series.

For multi-output products, normally V1 is isolated from the other output(s). To make it common granded, just connect +/- (accordingly) of V1 to the common connector of the other output(s).

4. Output power: If the output voltage is increased, the output current should be lowered to keep the constant power. While if the output voltage is decreased, the output current cannot exceed the rated value. 

5. Output ripple and noise:

As shown in fig.1, the ripple and noise of a switching power supply is normally specified by the peak to peak amplitude, and is made up of four AC components which can be identified:

(1) Low frequency ripple at 2f being of the AC mains frequency.

(2) High frequency ripple due to Pulse Width Modulation (PWM) to obtain the required line and load regulation.

(3) The switching noise that has the same frequency of the switching PWM.

(4) The aperiodic random noise that is not related to the AC source frequency and/or the switching frequency. 

6. How to test output ripple and noise of power supplies:

Fig 2 shows the best method for testing output ripple and noise of power supplies because the collection of the radiated noise is minimized.

As shown in fig.2, test by an oscilloscope with a bandwidth of 20MHz. The ground ring of the probe is pressed directly against the output ground of the power supply and the tip is in contact with the output voltage pin. Care must be taken when using the scope probe. 

7. Operating temperature: means the surrounding temperature of the Power supply when it is working. If it is installed inside the case of an equipment, it means the temperature of case inside, not the indoor or outdoor temperature. Therefore, if the operating temperature exceeds rated range, we suggest that the practical usable power should be derated by 2%/°C from the rated value or necessary cooling measurements should be taken to meet the required operating temperature.

8. MTBF: is based on calculation of average lifetime of the key components, and the statistics of the working situation of many similar equipment, not considering abnormal working situation of power supplies, air pollution, etc.

300w 24v dc power supply led transformer