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Specify Application:Always tell us what kind of equipment the transformer will be used in, so we can make sure it will meet all requirements for that application. Examples: "CRT monitor for medical equipment;" "Commercial audio amp."
Ambient Temp: Normally 25-40ºC (95-104ºF).
Cooling Method: Normally convection through chassis. Specify only if different.
Size/Weight Restrictions: Indicate the actual dimensions desired, diameter and height, or the maximum space available. Indicate if there are any weight restrictions.
Leads:8" long magnet wire self-leads except if the wire is smaller than 25 gauge, then multi-stranded leads will be used. Specify only if different.
Fill in the rest of the application data if you know the requirements, but leave it open if you are not sure.
Specify Secondaries
AC data and DC data are "either/or" alternatives. Do not fill in both for the same secondary.
AC Data
Specify AC when a secondary is loaded by an AC motor, a heater, incandescent light bulbs, or other linear impedance.
UP/UPnom: Specify UP/UPnom if US is specified for other than nominal voltage on the primary.
Duty Cycle: Specify Duty Cycle and the length of each cycle if Is is not for continuous duty.
Isolation & Step-Up/Down: This type of transformer is normally specified for AC load, even when it is used to supply equipment with rectifiers.
NOTE: The RMS current in a transformer with rectifier load varies with the supply voltage, and is also affected by the data for the transformer. Always specify THE LOAD TYPE for such a transformer. If the load is a Switch Mode Power Supply, we need to know the rated power and efficiency, plus the lowest supply voltage it shall run at.
DC Data
Specify DC when a secondary supplies a rectifier. Specify either Uc or Ucv, never both of them.
Uc: DC voltages as measured by a DC voltmeter.
Ucv: The valley point of DC voltage with ripple. If specified, you must also specify the filter capacitor size (µF).
Ic: DC current drawn by the load when Uc/Ucv has the specified value. Always specify nominal DC current and corresponding DC voltage. Also specify peak current.
Circuit: Specify as FWB, CTB, FWBL, or DHWL.
CTB circuits:Provide +Uc and -Uc or equal value. The currents in the two halves need not be equal. Use two lines with the same Secondary # (one with "+" for Uc/Ic, one with "-").
Load Type: Specify as L, S, A, or R.
UP/UPnom: Specify if Uc or Ucv is for other than nominal primary voltage.
Duty Cycle: Specify if Ic is not for continuous duty.
Other Specs
- If you do not use ordinary silicon diodes, you must specify the type of diodes used (e.g. Schottky Diodes).
- Specify resistance and current ripple in filter inductor when you specify FWBL or DHWL under Circuit.
- Specify the value of the filter capacitor (µF) when you specify Ucv, the valley voltage.
- Specify the lowest rated value for UP/UPnom when you specified "S" under Load Type and specified Uc and Ic at UPnom.
