LT1105C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1105C' PDF : 32 Pages View PDF
LT1103/LT1105
APPLICATIONS INFORMATION
Flyback Waveform for Continuous Mode Operation
a
b
c
d
e
f
∆I
VZENER
PRIMARY SWITCH VOLTAGE
[VOUT + Vf + (ISEC • RP)]/N
VIN
AREA “a” = AREA “b” TO MAINTAIN
ZERO VOLTS ACROSS PRIMARY
0V
SECONDARY WINDING VOLTAGE
[VOUT + Vf + (ISEC • RP)]
0V
AREA “c” = AREA “d” TO MAINTAIN
ZERO VOLTS ACROSS SECONDARY
N • VIN
BIAS WINDING VOLTAGE
[VOUT + Vf + (ISEC • RP)]/N1
0V
AREA “e” = AREA “f” TO MAINTAIN
ZERO VOLTS ACROSS BIAS WINDING
N2 • VIN
IPRI
PRIMARY CURRENT
Flyback Waveform for Discontinuous Mode Operation
a
b
c
d
VZENER
PRIMARY SWITCH VOLTAGE
[VOUT + Vf + (ISEC • RP)]/ N
VIN
AREA “a” = AREA “b” TO MAINTAIN
ZERO VOLTS ACROSS PRIMARY
0V
SECONDARY WINDING VOLTAGE
[VOUT + Vf + (ISEC • RP)]
0V
AREA “c” = AREA “d” TO MAINTAIN
ZERO VOLTS ACROSS SECONDARY
N • VIN
e
f
BIAS WINDING VOLTAGE
[VOUT + Vf + (ISEC • RP)]/ N1
0V
AREA “e” = AREA “f” TO MAINTAIN
ZERO VOLTS ACROSS BIAS WINDING
N2 • VIN
IPRI
∆I
PRIMARY CURRENT
0A
ISEC = IPRI/N
SECONDARY CURRENT
0A
ISEC = IPRI/ N
SECONDARY CURRENT
0A
IPRI
∆I
SWITCH CURRENT
0A
IPRI
∆I
SWITCH CURRENT
0A
IPRI
SNUBBER DIODE CURRENT
0A
∆t = (IPRI)[L(lkPRI)]/ VSNUB
0A
IPRI
SNUBBER DIODE CURRENT
0A
∆t = (IPRI)[L(lkPRI)]/ VSNUB
LT1103 WF01
22
Share Link: 
