AN1523 APPLICATION NOTE
ANNEX 2 - Switch Mode Transformer Specification (continued)
2.0 ELECTRICAL CHARACTERISTICS
For pins identifi cation refer to mechanical drawing
2.1 Static characteristics
2.1.1 Inductance and DC resistance:
Measurement of inductance is made using a LCR bridge at frequency of 10KHz at output voltage of 1 V r.m.s.
Measurement of resistance is made using a four wire ohmmeter.
Temperature should be 23 ± 2°C.
L(mH) tol(%) R(Ω) tol(%)
Between pin 2 and pin 1 2.0 ±10 2.31 ±15
2.1.2 Leakage Inductance:
LL= 6 %Lp (pin 2 pin 1 )
Measurement is made with the secondary windings short circuited.
Measurement if inductance is made using a LCR bridge at frequency of 10 kHz and at output voltage of 1 V R.M.S.
2.1.3 Withstanding voltage
The transformer shall withstand a voltage of 3.75kV RMS for 60 seconds between primary winding and secondary
The frequency of the test voltage shall be 50 or 60Hz.
2.2 Test circuit diagram and application conditions
+V 1 8
+1 2V/ 0. 3A
+5V /1.4 A
SWITCH MODE TRANSFORMER SPECIFICATION
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