1. Calculate the dissipated
power on the regulator and what the junction temperature does the
regulator will go up without heatsink? Assume +5V regulator run at
load current 600mA and ambient temperature is 25 °C.
2. Calculate the thermal resistance sink to ambient if you think that you need a heatsink for the regulator. Assume the thermal resistance for thermal interface material is 0.16 °C/W and the maximum ambient temperature of 45°C.
3. Calculate the thermal resistance sink to ambient.
4. If you do not want to use heatsink what can you do?
Homework Answers
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1. Calculate the dissipated power on the regulator and what the junction temperature does the regulator...
Prob #la(6 pts) A Regulator has a power dissipation of 10 watts is connected to a...
Prob #la(6 pts) A Regulator has a power dissipation of 10 watts is connected to a Heat sink with a thermal resistance of 3°0/w. If the case to function Resistance IS 5°c/w and the ambient temperature is 25°c, what is the function temperature? (Assume perfect contact between the Heatsink and the Regulator), Prob #16( 8 pts) For the following crevit, plot vout versus Vin, find Vmark and Unin. Also give the slope of Votiin. R2=2k 1K2 Vro R2=1.Ok2 - 0,=...
QUESTION 4(Total 12.5 Marks) The switch current and voltage waveforms of a power converter are shown in the next page....
QUESTION 4(Total 12.5 Marks) The switch current and voltage waveforms of a power converter are shown in the next page. The switch has a maximum junction temperature, T,max140°C and a junction-to-case thermal resistance Rc 0.55°C/w (a) How much power is dissipated by the switch? Sketch the power waveform (7.5 marks) (b) The converter operates in an ambient of 25°C and the switch is mounted on a heat sink. Specify the value of thermal resistance of the heat sink, if a...
20. The LM317 has a maximum operating temperature of 125°C. The TO-220 case version shows a...
20. The LM317 has a maximum operating temperature of 125°C. The TO-220 case version shows a thermal resistance of 4 C°/W, junction to case. It also shows 50 C°/W, junction to ambient (no heat sink used). Assuming an ambient temperature of 50°C. What is the maximum allowable power dissipation for each setup? Assume that the first version uses a 15 C°/W heat sink with a 2 C°/W case to heat sink interconnection. Please and Thank You
0 9 A MOSFET is installed on a heat sink as shown in Fig. 2. The...
0 9 A MOSFET is installed on a heat sink as shown in Fig. 2. The junction-to-case thermal resistance and the case-to- sink thermal resistance of the MOSFET are 1.6°C/W and 0.5°C/W respectively. Power loss of the MOSFET is 4W. If the maximum operating temperature of the MOSFET is 60°C and the temperature of the ambient environment is 30°C, calculate the minimum thermal resistance of the heat sink Pe 2
Your supervisor has also passed on to you a power supply circuit sketch to upgrade your last power supply (Assignment 1) so that it has a Fixed 5V regulator output and a Variable Voltage Regulat...
Your supervisor has also passed on to you a power supply circuit sketch to upgrade your last power supply (Assignment 1) so that it has a Fixed 5V regulator output and a Variable Voltage Regulator output. . Analyse the variable regulator section (containing the LM317 IC) and determine the expected output voltage range the circuit should achieve by the range of adjustment of the 1k potentiometer. Build the circuit and verify the voltage range available. Ensure it can achieve 12V...
Given: A MOSFET is used in a switching power-pole found in Fig. 2-4a of the text....
Given: A MOSFET is used in a switching power-pole found in Fig. 2-4a of the text. The operating conditions are as follows: Vin 35V, 6 A, the switching frequency fs 300 kHz, and the duty ratio d 0.4 a) Consider the diode in the power pole. Assuming an offset voltage forward bias model of the free-wheeling diode in which VM 1.2 V, calculate the average forward power loss in the diode HINT: Consider Eq. 2A-1 b) In the diode reverse...
Temperature Measurement Chapter 4 IT02 Curriculum Manual Enter the total change in the resistance of the...
Temperature Measurement Chapter 4 IT02 Curriculum Manual Enter the total change in the resistance of the RTD Transducer over the 4.5a temperature range 20-50°C in 4.5b Is the resistance/temperature characteristic lincar? Yes or No 4.5e Enter your estimated (extrapolated) resistance of the RTD Transducer from the graph at 0°C. During the exercise, the current flowing was of the order of ImA. Since the applied voltage was +5V, the total circuit resistance was therefore of the order of Skn (which you...
1. Consider a 1N4001 silicon diode used as a temperature sensor.The 1N4001 has an n1.43 calculate...
1. Consider a 1N4001 silicon diode used as a temperature sensor.The 1N4001 has an n1.43 calculate the temperature measured for the following conditions 2. Consider a IN4007 silicon diode used as a temperature sensor. The IN4001 has an n-1.4, calculate the temperature measured for the following conditions: . VD2-0.629V @ ID2 2mA 3. Consider a IN4001 diode used as a temperature sensor. Calculate the value of n when the temperature measured is 37°C for the following conditions: . Vin =...
Table 1: Zener Diode Parameters Description Quantity Value 1.0 W Po Absolute maximum power dissipation Typical...
Table 1: Zener Diode Parameters Description Quantity Value 1.0 W Po Absolute maximum power dissipation Typical zener voltage 5.6 V Minimum zener (knee) current 1.0 mA 45 mA Typical zener current Maximum zener current IZM Zz Zener impedance Zener knee impedance 179 mA 52 600 22 25 °C ZzK ΤΑ Rated ambient temperature 1N4004 Rs = 100 22 220 uF 1N4734A Transformer Vs = 12.6 VRMS 1N4004 60 Hz 2. Going back to Figure 1, remove the load resistance (or,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
Prob #la(6 pts) A Regulator has a power dissipation of 10 watts is connected to a Heat sink with a thermal resistance of 3°0/w. If the case to function Resistance IS 5°c/w and the ambient temperature is 25°c, what is the function temperature? (Assume perfect contact between the Heatsink and the Regulator), Prob #16( 8 pts) For the following crevit, plot vout versus Vin, find Vmark and Unin. Also give the slope of Votiin. R2=2k 1K2 Vro R2=1.Ok2 - 0,=...
QUESTION 4(Total 12.5 Marks) The switch current and voltage waveforms of a power converter are shown in the next page. The switch has a maximum junction temperature, T,max140°C and a junction-to-case thermal resistance Rc 0.55°C/w (a) How much power is dissipated by the switch? Sketch the power waveform (7.5 marks) (b) The converter operates in an ambient of 25°C and the switch is mounted on a heat sink. Specify the value of thermal resistance of the heat sink, if a...
0 9 A MOSFET is installed on a heat sink as shown in Fig. 2. The junction-to-case thermal resistance and the case-to- sink thermal resistance of the MOSFET are 1.6°C/W and 0.5°C/W respectively. Power loss of the MOSFET is 4W. If the maximum operating temperature of the MOSFET is 60°C and the temperature of the ambient environment is 30°C, calculate the minimum thermal resistance of the heat sink Pe 2
Your supervisor has also passed on to you a power supply circuit sketch to upgrade your last power supply (Assignment 1) so that it has a Fixed 5V regulator output and a Variable Voltage Regulator output. . Analyse the variable regulator section (containing the LM317 IC) and determine the expected output voltage range the circuit should achieve by the range of adjustment of the 1k potentiometer. Build the circuit and verify the voltage range available. Ensure it can achieve 12V...
Given: A MOSFET is used in a switching power-pole found in Fig. 2-4a of the text. The operating conditions are as follows: Vin 35V, 6 A, the switching frequency fs 300 kHz, and the duty ratio d 0.4 a) Consider the diode in the power pole. Assuming an offset voltage forward bias model of the free-wheeling diode in which VM 1.2 V, calculate the average forward power loss in the diode HINT: Consider Eq. 2A-1 b) In the diode reverse...
Temperature Measurement Chapter 4 IT02 Curriculum Manual Enter the total change in the resistance of the RTD Transducer over the 4.5a temperature range 20-50°C in 4.5b Is the resistance/temperature characteristic lincar? Yes or No 4.5e Enter your estimated (extrapolated) resistance of the RTD Transducer from the graph at 0°C. During the exercise, the current flowing was of the order of ImA. Since the applied voltage was +5V, the total circuit resistance was therefore of the order of Skn (which you...
1. Consider a 1N4001 silicon diode used as a temperature sensor.The 1N4001 has an n1.43 calculate the temperature measured for the following conditions 2. Consider a IN4007 silicon diode used as a temperature sensor. The IN4001 has an n-1.4, calculate the temperature measured for the following conditions: . VD2-0.629V @ ID2 2mA 3. Consider a IN4001 diode used as a temperature sensor. Calculate the value of n when the temperature measured is 37°C for the following conditions: . Vin =...
Table 1: Zener Diode Parameters Description Quantity Value 1.0 W Po Absolute maximum power dissipation Typical zener voltage 5.6 V Minimum zener (knee) current 1.0 mA 45 mA Typical zener current Maximum zener current IZM Zz Zener impedance Zener knee impedance 179 mA 52 600 22 25 °C ZzK ΤΑ Rated ambient temperature 1N4004 Rs = 100 22 220 uF 1N4734A Transformer Vs = 12.6 VRMS 1N4004 60 Hz 2. Going back to Figure 1, remove the load resistance (or,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
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