Khashayar Khosravi, Wei Wei, John Sawicki, Tilahun Abayu and Billy Row

1
LDO Prototype Design
Khashayar Khosravi, Wei Wei, John Sawicki,
Tilahun Abayu and Billy Row
student1_at_utdallas.edu, student2_at_utdallas.edu,
student3_at_utdallas.edu, student4_at_utdallas.edu
Department of Electrical Engineering Erik Jonsson
School of Engineering Computer
Science University of Texas at Dallas Richardson,
Texas 75083-0688, U.S.A.
Project Results
Project Goals

• Line
  Response
• Without feedback protection Current
  Protection Included
• Transient of
  designed LDO

• Build a current-fold back circuit to protect the
  circuit from a high current.
• Build a temperature protection circuit to turn
  off the power supply to the LDO for high internal
  temperatures.
• Adjust the output capacitor to make the circuit
  stable.
• Program the micro-controller to control the
  circuit by using the
• computer.

Project Overview
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• Application Circuit Diagram (Current fold-back
  circuit , Micro Controller and Temperature
  protection circuit )
• ATMEAG164-P/V MICROCONTROLLER
• 8 MHz Operating Frequency (internal
  oscillator)
• 5 interrupt-driven outputs to select a
  feedback resistor
• USART Communication for
• Resistor Selection

Project Conclusions/Outcomes

• We add protection circuit in our designed.
  Performance isnt effected for low current, but
  output voltage is lower when the maximum current
  is reached.
• The current stayed under the set current limit.
• Output voltage can be selected from the computer
  keyboard.
• Ts decreased from 520ns to 96ns and Vpp decreased
  from 200mV to 56mV.