AN1262 APPLICATION NOTE

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Figure 24. Test board main waveforms under different operating conditions

Figure 25. Test board load transient response; effect of frequency change (left).

20

REFERENCES

[1] Lloyd H. Dixon, Jr. "Filter Inductor and Flyback Transformer Design for Switching Power Supplies", UNI-

TRODE Power Supply Design Seminar Manual, 1994 (SEM-1000)

[2]"Calculation of Transil Apparent Dynamic Resistence" (AN575)

[3]"Transistor Protection by Transil" (AN587)

[4]"Getting Familiar with the L6590 Family High-voltage Fully Integrated Power Supply" (AN1261)

A1: Idrain

Ch1: Vdrain

Vin = 100 V

Iout = 2 A

Vin = 100 V

Iout = 50 mA

A1: Idrain

Ch1: Vdrain

Vin = 400 V

Iout = 2 A

Vin = 400 V

Iout = 50 mA

A1: Idrain

Ch1: Vdrain

A1: Idrain

Ch1: Vdrain

Vin = 200 V

Iout = 0.2

↔ 0.4 A

Vout

Iout

Vin = 200 V

Iout = 0.1

↔ 0.3 A

Vout

Iout

transition

22

⇒ 65 kHz

transition

65

⇒ 22 kHz