LMF1500-20xx Series DC Switching Power Supply

This ac dc DC Switching Power Supply is a power supply device used to convert the input voltage into a stable output voltage. It uses switching devices (such as transistors or MOSFETs) to control the switching state of the circuit to achieve high-efficiency power conversion. Switching Power Supply is generally more efficient and smaller than traditional linear power supplies. It is widely used in electronic equipment, computers, communication equipment and other fields.

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  • Wide input voltage range 85 – 264VAC or 120 – 370VDC
  • Accepts AC or DC input (dual-use of same terminal)
  • Built-in active PFC function
  • Operating ambient temperature range: -40℃ to +70℃
  • High reliability, efficiency up to 94%
  • Wide range of adjustable output voltage
  • Output short circuit, 5s constant-current, over-voltage, over-temperature protection
  • Support 3+1 parallel redundancy, current sharing
  • Operating up to 5000m altitude
  • Fan speed automatic adjustable
  • Safety according to IEC/EN/UL62368-1, EN/ES/IEC60601-1, IEC60335-1, GB4943.1


Input Specifications
Item Operating Conditions Min. Typ. Max. Unit
Input Voltage Range Rated input 100 240 VAC
AC input 85 264
DC input 120 370 VDC
Input Voltage Frequency 47 63 Hz
Input Current 115VAC 15.5 A
230VAC 8
Inrush Current 115VAC Cold start 16 20
230VAC 32 40
Power Factor 115VAC Room-temperature, full load PF≥0.99
230VAC PF≥0.95
Leakage Current 240VAC Earth leakage current <0.5mA
Touch current <0.5mA
Hot Plug Unavailable


Output Specifications
Item Operating Conditions Min. Typ. Max. Unit
Output Voltage Accuracy Full load Vo1 ±1.0 %
Vo2 ±2.0
Line Regulation Rated load Vo1 ±0.5
Vo2 ±1.0

Load Regulation


0%-100% load

Vo1 ±0.5
Vo2 ±3.0


Ripple & Noise*


20MHz bandwidth (peak-to-peak value)

Vo1:12V/15V/24V/27V 150  



Vo1: 36V/48V 200
Vo1: 54V 250
Vo2: 5V 100
Hold-up Time Full input voltage 12 ms
Short Circuit Protection* After the short-circuit disappears, the recover time < 5s Hiccup, self-recover
Constant Current Protection* 230VAC Constant current limit,

output voltage turn off after 5s, self-recover




Over Voltage Protection

12V ≤16.5V  



Output voltage turn off, re-power& PS_ON on for recover

15V ≤25.0V
24V ≤33.0V
27V ≤35.0V
36V ≤48.0V
48V ≤60.0V
54V ≤63.0V
Over-temperature Protection Over-temperature protection activation 70  

Over-temperature protection deactivation 50
Minimum Load 0  


Dynamic Minimum Load 10
Fan The fan speed is linearly adjusted and determined by the output power and output voltage together
Note:1. *The “Tip and barrel method” is used for ripple and noise test, output parallel 47uF electrolytic capacitor and 0.1uF ceramic capacitor, please refer to enclosed switching power supply application notes for specific information;

2.*Over current protection is realized in constant current mode, see section 2.6 of the application manual below; 3.*For auxiliary short-circuit mode, refer to Section 2.7 of the Application Manual below.

General Specifications.
Item Operating Conditions Min. Typ. Max. Unit

Isolation Test

Input – output  

Test for 1min, leakage current <10mA



Input – 2000
Output – 1250

Insulation Resistance

Input – output Environment temperature: 25±5℃

Relative humidity: <95%RH, non-condensing Testing voltage: 500VDC




Input –
Output –
Operating Temperature -40 +70  

Storage Temperature -40 +85
Storage Humidity Non-condensing 10 95 %RH
Operating Humidity 20 90
Switching Frequency PFC @ rated output 65 kHz
LLC @ rated output 85




Power Derating



Operating temperature derating



-40℃ to -30℃ 5  




-30℃ to +45℃ 0
+45℃ to +70℃ 1.6



-40℃ to -30℃ 5
-30℃ to +50℃ 0
+50℃ to +70℃ 2
Input voltage derating 85VAC – 100VAC 2 %/VAC
Safety Standard Safety according to IEC/EN/UL62368-1, EN/ES/IEC60601-1, IEC60335-1, GB4943.1
Safety Class CLASS I

Isolation Level

Input – output 2 × MOPP
Input – 1 × MOPP
Output – 1 × MOPP
MTBF MIL-HDBK-217F@25℃ >250,000 h