LT1105C datasheet(22/32 Pages) LINER

22 / 32 page

LT1103/LT1105

Flyback Waveform for Discontinuous Mode Operation

Flyback Waveform for Continuous Mode Operation

VZENER

AREA “a” = AREA “b” TO MAINTAIN

ZERO VOLTS ACROSS PRIMARY

[VOUT + Vf + (ISEC • RP)]/N

VIN

PRIMARY SWITCH VOLTAGE

AREA “c” = AREA “d” TO MAINTAIN

ZERO VOLTS ACROSS SECONDARY

[VOUT + Vf + (ISEC • RP)]

N • VIN

SECONDARY WINDING VOLTAGE

[VOUT + Vf + (ISEC • RP)]/N1

BIAS WINDING VOLTAGE

AREA “e” = AREA “f” TO MAINTAIN

ZERO VOLTS ACROSS BIAS WINDING

N2 • VIN

∆I

IPRI

PRIMARY CURRENT

ISEC = IPRI/N

SECONDARY CURRENT

IPRI

∆I

SWITCH CURRENT

IPRI

SNUBBER DIODE CURRENT

∆t = (IPRI)[L(lkPRI)]/VSNUB

VZENER

AREA “a” = AREA “b” TO MAINTAIN

ZERO VOLTS ACROSS PRIMARY

[VOUT + Vf + (ISEC • RP)]/N

VIN

PRIMARY SWITCH VOLTAGE

AREA “c” = AREA “d” TO MAINTAIN

ZERO VOLTS ACROSS SECONDARY

[VOUT + Vf + (ISEC • RP)]

N • VIN

SECONDARY WINDING VOLTAGE

[VOUT + Vf + (ISEC • RP)]/N1

BIAS WINDING VOLTAGE

AREA “e” = AREA “f” TO MAINTAIN

ZERO VOLTS ACROSS BIAS WINDING

N2 • VIN

∆I

IPRI

SNUBBER DIODE CURRENT

IPRI

PRIMARY CURRENT

ISEC = IPRI/N

SECONDARY CURRENT

IPRI

SWITCH CURRENT

LT1103 WF01

∆t = (IPRI)[L(lkPRI)]/VSNUB

APPLICATIONS INFORMATION

LT1105C Datasheet(PDF) 22 Page - Linear Technology

LT1105C Datasheet(HTML) 22 Page - Linear Technology

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