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379Index
Basic principle 2–3
Considerations 3–6
Elementary discrete designs 6
One-transistor series-pass
regulator 7
Zener shunt regulator 6
Floating linear
regulators 10–12
Three-terminal regulator
designs 7
Positive regulator
design 7–9
Variations 9–10
Load dump 127
Low dropout regulator 5
Low-side MOSFET 69
M
Magnetics 29
and DC-DC converter
design 29
D e nition 70–72
and Off-line converter
design 295
Magnetization current
component 321
Maxim 143
Miller plateau 263
MKS (meter-kilogram-seconds)
units 70, 71
Mobility 227
MOS controlled thyristor
(MCT) 239–241
MOSFET 227
Characteristics 277–278
Conduction loss 256–257
Gate threshold voltage 261
Parasitic capacitances, in
alternate system 259–261
Simplifi ed model 257–259
Switching losses 256
Multiple phase PWM
controllers 116
N
Non-isolated circuits 117
Boost converter
designs 127–133
Buck/boost designs 137–141
Buck converter
designs 118–127
Charge pump designs 141–145
General design method 118
Inverting designs 133–137
Layout considerations 145–147
Non-isolated yback
design 170–174
Non-isolated forward
converter 180–183
O
Off-line converter design 295
Flyback converter magnetics
Current ripple ratio 305
Designing 308–315
Equivalent buck-boost
models 302–304
Leakage
inductance 305–306
Polarity of windings, in
transformer 296–298
Primary-side leakage
inductance, measurement
of 307–308
Secondary-side
leakage 306–307
Transformer action 298–302
Wire gauge and foil
thickness 316–319
Zener clamp dissipation 306
Forward converter
magnetics 319
Designing 328–343
Duty cycle 319–323
Relating core size 326–327
Window utilization 324–326
Worst-case input voltage
end 323–324
Off-line yback design 163–170
Off-line forward
converter 176–180
Off-the-shelf inductor 30, 47–49,
77
Copper loss 82–83
Core loss 83
Current ripple ratio 80
Estimating requirements
78–79
Flux density 81–82
Peak current 80–81
Temperature rise 84
Optimizing driver capability
and MOSFET characteristics
277–278
P
P-channel MOSFETs 235–236
Peak current 36–37, 80–81
Peak diode current See Peak
current
Peak inductor current See Peak
current
Peak switch current See Peak
current
Pedestal, of inductor current 33
Phase control thyristors 213
Platform, of inductor current 33
Popular names
of Thyristors 214–215
Post regulators 5
Power diodes 198–199
Fast and ultra fast
rectifi ers 203–204
Forward recovery 199–200
GaAs power diodes 206–208
Reverse recovery 200–203
Schottky rectifi ers 204–205
“ Power factor ” 280
Power factor correction 279
180 W discontinuous-mode
boost PFC circuit
Current sensing circuit
291
Design specifi cation 286
E M I lter section 292–293
Inductor design 287–290
Predesign
considerations 286–287
Printed circuit board
considerations 293
Start-up circuit 290
Transformer
construction 290
Voltage feedback
circuit 291–292
Voltage multiplier input
circuit 291
Design of 285–286
Harmonics and power factor,
specifi cation 284–285
Power MOSFETs
Advancement 235–236
Characteristics 226–227

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