Aditya Makharia Advisor: Prof. Gabriel A Rincón- Mora
Georgia Tech Analog Consortium School of galvanizing and Computer Engineering Georgia Institute of Technology, Atlanta, USA
March 21,2003
Abstract
Mobile, battery-powered applications require:
» Low Voltage, High Efficiency, High Power, High true statement solutions. » SOC Integrated Power allow for circuits (dc-dc) Integrated Power Inductors
DC-DC converters theatrical role discrete inductors, which:
» Impede SOC Implementation Take-up PCB Real res publica Add Cost
Inductorless versions currently available are:
» Charge Pumps (use off-chip capacitors) suited only for low power Apps. » Linear Regulators suffer from scant(p) efficiency.
Goal:
» Design a fully integrated DC-DC Converter for Portable Power Applications. » Integrate Power Inductors on to the distribute (IC). Maximize the use of integrated inductors through and through circuit take techniques, like Inductor Multipliers, as well as through fabrication process steps.
Role of Inductors in Power Supply Ckts.
Buck (Step-down) DC-DC Converter
L IO VO RLOAD
COUT VIN
Transfers energy from input to output in a lossless fashion. Filters the output from switching signals.
Error Amplifier and discombobulate Control
Inductor determines output current
voltage ripple (?VO ripple bandwidth requirements3.
1
(?IL)1,
)2,
and
Inductor Current in Buck Converter
VIN ? VO L
? V ? VO ? ?t ?I = ? IN L ? ? on L ? ?
? V ? VO ? ?t * R ?V O = ? IN ? on ESR_C ? L ? ? 1 3 complex poles @ 2? LC
2
VO L
?IL
tON
tOFF
As L
?IL
Power
, VO_Ripple
Accuracy
Inductorless Options
completely a switch (resistor) is use for transferring energy. Capacitor are used for transferring energy. Operation: Operation: Value of resistance is modulated by feedback control Periodic charging and discharging of of the output voltage. capacitors, from the supply to the load. Pros: ...If you want to play a full essay, order it on our website: Ordercustompaper.com
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