component selection by prof. bitar. power supply example input: 120vac / 60hz (nominal) output: 5v...
TRANSCRIPT
![Page 1: Component Selection By Prof. Bitar. Power Supply Example Input: 120VAC / 60Hz (nominal) Output: 5V +/- 5%(4.5 to 5.5 V) 100mA (max)](https://reader031.vdocuments.us/reader031/viewer/2022032723/56649f535503460f94c77e44/html5/thumbnails/1.jpg)
Component Selection
By
Prof. Bitar
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Power Supply Example
• Input:• 120VAC / 60Hz (nominal)
• Output:• 5V +/- 5% (4.5 to 5.5 V)• 100mA (max)
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Possible Full-Wave Topologies(Assuming Linear Voltage Regulators)
D1
D2
C1
+
12
0V
AC
, 6
0H
z
INGND
OUT
U1
LoadC2
Vout
N1N2
N3
TR1
N1 N2
TR1
D1
C1
+
12
0V
AC
, 6
0H
z
INGND
OUT
U1
LoadC2
Vout
D4
D3
D2
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Typical Voltage WaveformsT
Secondary Voltage (A)
Secondary Voltage (B)
After Rectifying and Filtering Ripple VoltageAfter Regulator
Time (s)
0.00 10.00m 20.00m 30.00m 40.00m 50.00m
Out
put
-10.00
-5.00
0.00
5.00
10.00
V drop across regulator
Ripple VoltageAfter Regulator After Rectifying and Filtering
Secondary Voltage (B)
Secondary Voltage (A)
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Begin Distributor Part Searchfor “Voltage Regulators”
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Yikes! Only 41,864 Possibilities…
41,864 Possibilities!
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Narrow the Search!
In Stock !!!
6,241 Linear
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Further Search Criteria• Current (100mA)• Package / Case (TO-92 Thru-Hole!)• Packaging (for shipping)• Topology (Positive Fixed)• Voltage (5V)
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Down to Mfg & Pricing(Note Sorting Criteria)
• Fairchild Semiconductor $0.32(More $, but better spec sheets & support.)
• Micro Commercial Co:$0.20(Not as well supported, but CHEAP!)
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Selecting Part-Number Link Yields More Information Including Price Breaks!
Finally a Data Sheet!
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Component Data Sheet• Absolute Maximum Ratings
(Not to be exceeded !!)• Input Voltage Max (30V)• Operating Temp (-20 to 120 C)• Storage Temp (-55 to 150 C)
• Electrical Characteristics
(Under very specific test conditions!)• Output Voltage
(4.8 to 5.2 V @ T = 25 C)
• Load Regulation (ΔVOUT / Δ ILOAD)
(60mV MAX from 1 to 100mA)
• Line Regulation (ΔVOUT / Δ VIN)
(150mV MAX, Vin from 7 to 20V)
• Quiescent Current (5.5mA MAX)
• Output Noise Voltage (40uV TYPICAL)
• Ripple Rejection (41dB MIN)
• Dropout Voltage (1.7V TYPICAL)
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Q: Does this Voltage Regulator Meet our Specifications? YES!
• OK, Repeat this Process for Every Component…
• Power Transformer• Diodes• Filter Capacitors
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Selecting a Power Transformer
• Questions:1. What voltage do we need?
2. What is the maximum current?
3. What configurations do we need?
4. What configurations are available?Single or Dual Primary
Single or Dual Secondary
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1. What Voltage Do We Need?
• Desired DC Output = 5V• Minimum Drop Across Regulator = 1.7V (spec)• Maximum Ripple Voltage = 1V (guess)• Drop Across Rectifier Diodes = 0.7 or 1.4V• Therefore, for C.T. Transformer:
• Vpk = 5+1.7+1+0.7 = 8.4V = 5.9VRMS
• Or for Full-Wave Bridge:• Vpk = 5+1.7+1+1.4 = 9.1V = 6.4VRMS
• OK, Looking for 6.4VRMS @ 100mA (min)
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Parts Distributor Search
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Possible Choices
Tamura 3FS212 : 6.3VAC, 180mA Transformer $3.75
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Transformer Spec Sheet
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Electrical Specifications
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Mechanical Specifications
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Hole Pattern Spacing
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Configuration Options
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Available Voltages / Currents