Estimate your sizing factor
Step 1:
Enter required output
power in Watts DC:
Step 2:
Select circuit topology:
Push-pull input, full wave center tapped secondary (1.00)
Bridge input, full wave center tapped secondary (0.86)
Bridge input, bridge output (0.72)
Current fed bridge input, full wave center tapped secondary (0.93)
Current fed bridge input, bridge output (0.77)
Forward (2.05)
Flyback (2.24)
Step 3:
SIZING FACTOR is:


About these calculations:

The sizing factor equals watts DC output multiplied by average loss factors (input switch, transformer, output rectifiers), topology factors, 40°C transformer temperature rise, and average insulating factors. Contact Precision engineering for final sizing based on your specific requirements.

 
  Precision Products
High Frequency Power		  
  SWITCHMODE TRANSFORMERS

Our standard switchmode transformers are available in five families, listed below. Click on the product family that interests you to review a detailed spec sheet, or browse them all. If you're not sure which product family is suitable to your application, use the calculator (at right) to estimate the sizing factor of the product you need. If our standard products don’t fit your requirements, contact us to review the wide range of custom sizes and shapes available.

FEATURES
  • Low Profile
  • Low Leakage inductance designs
  • IEC-spacing compatible
  • Thru hole and surface mount available
FREQUENCY vs.
SIZING FACTOR
FREQ SIZING FACTOR
25KHz 3.5 to 76
50KHz 6.4 to 135
100KHz 10.1 to 190
200KHz 15.0 to 255
500KHz 18.5 to 320
1MHz 22.0 to 380
FEATURES
  • Available in thru hole and surface mount
  • High power density/volume
  • Small footprint
  • Good for gapped or ungapped applications
  • Less-ideal for applications involving IEC
FREQUENCY vs.
SIZING FACTOR
FREQ SIZING FACTOR
25KHz 4.0 to 97
50KHz 7.1 to 165
100KHz 11.5 to 230
200KHz 15.5 to 290
500KHz 19.0 to 340
1MHz 23.0 to 410
FEATURES
  • Good for gapped or ungapped applications
  • Side-pin configuration gives best reliability and manufacturability
  • Less-ideal for applications involving IEC spacing requirements
FREQUENCY vs.
SIZING FACTOR
FREQ SIZING FACTOR
25KHz 6.6 to 280
50KHz 11.5 to 480
100KHz 17.5 to 700
200KHz 24.0 to 890
500KHz 30.0 to 1200
1MHz 35.0 to 1400
FEATURES
  • High power density/volume
  • Small footprint
  • Good for gapped or ungapped applications
  • Less-ideal for applications involving IEC
FREQUENCY vs.
SIZING FACTOR

FREQ SIZING FACTOR
25KHz 46 to 490
50KHz 75 to 800
100KHz 113 to 1160
200KHz 140 to 1490
500KHz 180 to 1900
1MHz 220 to 2350
FEATURES
  • Ideal for IEC spacing applications
  • Low leakage inductance
  • Choice of low-profile horizontal or upright vertical mounting
FREQUENCY vs.
SIZING FACTOR
FREQ SIZING FACTOR
25KHz 110 to 1900
50KHz 175 to 3100
100KHz 260 to 4500
200KHz 340 to 5800
500KHz 440 to 7400
1MHz 520 to 8800