55:041 Electronic Circuits
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1 55:041 Electronic Circuits Output Stages and Power Amplifiers Sections of Chapter 8 A. Kruger Power + Output Stages1
2 Power Amplifiers, Power FETS & BJTs Audio (stereo) MP3 Players Motor controllers Servo controllers (robotics) Drivers for transducers Sonar Buzzers Laser diodes (CDs, DVDs) Considerations Low output resistance (to deliver power) Low total harmonic distortion Power dissipation by output transistors A. Kruger Power + Output Stages2
3 Packaging Schemes Can/tab is normally the collector (BJT) Heat sink E & B (BJT) TO-3 One of these may also be collector (BJT) A. Kruger Power + Output Stages3
4 Packaging Schemes Tab is normally the Collector (BJT) or Drain (MOSFET) Schottky Diode E & B (BJT) or G & S (MOSFET) DPAK TO-252 MOSFET ChipFET A. Kruger Power + Output Stages4
5 Packaging Schemes 200 A, 100 V, 4.5 mω FET $ A, 200 V, 3.5 mω FET $260 A. Kruger Power + Output Stages5
6 Typical DC β for 2N3055 (Power BJT) Sect Note that at 10 A, β drops to 10! β increases gets better with increasing temp β decreases (significantly) with increasing I C A. Kruger Power + Output Stages6
7 Safe Operating Area (SOA) for BJT Max I, determined by, for example, how much current bonding wires can handle Max V normally determined by avalanche breakdown of reverse biased CB junction. Linear scale Log scale Max P T, hyperbola SOA Slight non-uniformities in semiconductor material causes non-uniformities in current density. This produces regions of increased heating, which lowers the resistance of semiconductor, which increases current, which generates more heat,... This can cause material to melt. This is called second breakdown. A. Kruger Power + Output Stages7
8 Interdigitated BJT: Top view Cross-sectional view A. Kruger Power + Output Stages8
9 Typical High-Power MOSFET Characteristics Sect g m decreases with increasing temperature But, variation in g m is less than variation in β Power MOSFETs no second breakdown Faster switching times A. Kruger Power + Output Stages9
10 High-Power MOSFET Structures Special structures to lower contact resistance, channel resistance and aid heat removal VMOS DMOS HEXMOS / HEXFET A. Kruger Power + Output Stages10
11 Drain-to-Source Resistance Versus I D Some MOSFETSs have R DS(ON) in milliohm range At I D = 30 A, V DS > 15 V P D = = 450 W Note the large currents A. Kruger Power + Output Stages11
12 Sect Comparing Power BJTs and MOSFETS BJT Large base current I C = 10 A, β = 10, needs I B = 1 A Second breakdown Thermal runaway MOSFET No gate current, can be driven by standard logic circuit No second breakdown No thermal runaway MOSFETs are rapidly replacing power BJTs A. Kruger Power + Output Stages12
13 I C /I D Versus Time Characteristics Sect 8.3 Class-A (always on) Class-B (on during one half cycle) Class-AB (hybrid) Class-C (on less than one half cycle) A. Kruger Power + Output Stages13
14 Class-A CE Amplifier Sect Q-point was chosen for maximum output swing Consumes power even when there is no input signal Don t design this into MP3 player/cell phone etc. signal load power η(max) = = supply power 25% A. Kruger Power + Output Stages14
15 BJT Saturation Voltage In both circuit, as I B increases, I C increases and V CE decreases. However, it reaches a point where V CE will not decrease, regardless how much I B is. This is the saturation voltage V CE(sat) For low power BJTs, V CE(sat) is often 200 mv~ 600 mv. However, saturation voltage can be higher. For example, for the PN2222 it is ~ 1 V For power transistors this can be significant. For example, for the 2N3055 BJT, V CE(sat) can be as high as A. Thus, P D = 4.4 W in saturation. A. Kruger Power + Output Stages15
16 I C /I D Versus Time Characteristics Sect 8.3 Class-A (always on) Class-B (on during one half cycle) Class-AB (hybrid) Class-C (on less than one half cycle) A. Kruger Power + Output Stages16
17 Inductively Coupled Class-A Amplifier Short at DC (establish Q-point). Open at AC Sect DC and AC load lines η(max) = 50% This is double that of a Class A with collector resistor A. Kruger Power + Output Stages17
18 Transformer-Coupled Common Emitter A transformer gives us flexibility to transform the load resistance to a value that is easier to work with. Sect What do these dots mean? a is the turns ratio R L = a 2 R L η(max) = 50% A. Kruger Power + Output Stages18
19 Transformer-Coupled Emitter Follower Sect R L = a 2 R L η(max) = 50% A. Kruger Power + Output Stages19
20 Class-A Characteristics Power hungry efficiency is 25%, or 50% but then inductors/transformers are needed (costly, heavy) Simple Inherently low distortion A. Kruger Power + Output Stages20
21 I C /I D Versus Time Characteristics Sect 8.3 Class-A (always on) Class-B (on during one half cycle) Class-AB (hybrid) Class-C (on less than one half cycle) A. Kruger Power + Output Stages21
22 Class-B Complementary Push-Pull Output Stage Sect Note dual power supplies With v i = 0, both transistors off => no current consumption Note dual power supplies A. Kruger Power + Output Stages22
23 Class-B Complementary Push-Pull Output Stage Sect On Note dual power supplies Off Note dual power supplies A. Kruger Power + Output Stages23
24 Class-B Complementary Push-Pull Output Stage Sect Note dual power supplies Off On Note dual power supplies A. Kruger Power + Output Stages24
25 Voltage Transfer Characteristics: Complementary Push-Pull Output Stage Transistors off until v i reaches V BE(ON) Crossover distortion A. Kruger Power + Output Stages25
26 Effective Load Line: Ideal Class-B Output Stage A. Kruger Power + Output Stages26
27 Average Power Dissipation vs. Peak Output Voltage: Class-B Output Stage P Qn 2 VCC (max) = 2 π R η(max) 78.5% L Remember, for Class A, η = 25% (fixed) A. Kruger Power + Output Stages27
28 Bipolar Class-AB Output Stage Sect Supply bias voltages so that both transistors are turned on, with small quiescent current A. Kruger Power + Output Stages28
29 Characteristics of Class-AB Output Stage Input Signal Transistor Currents Load Current A. Kruger Power + Output Stages29
30 Class-AB Output Stage: Q-Point Established by Diodes Sect How? Place diodes in same thermal environment as transistors A. Kruger Power + Output Stages30
31 Class-AB Output Stage: Darlington Pair Sect Mimics a PNP Darlington Why not use PNP Darlington (no mimic)? A. Kruger Power + Output Stages31
32 MOSFET Class-AB Output Stage Supply bias voltages so that both FETs are turned on, with small quiescent current MOSFETs V TO s vary much more than BJT s V BE See example 8.8 A. Kruger Power + Output Stages32
33 Matched and Complementary Transistors Push-pull stages work best if the complementary output transistors have matching characteristics. That is, ββ nn = ββ pp, VV nn(ssssss) = VV pp(ssssss), etc. or VV TTTT = VV TTTT, KK nn = KK pp, etc. This hard to achieve in discrete parts, but there are several so-called complemenary-pairs on the market. It is easier to achieve close matching in ICs A. Kruger Power + Output Stages33
34 A. Kruger Power + Output Stages34
35 A. Kruger Power + Output Stages35
36 Amplifier IC LM mw amplifier (~ $1) Class-AB output Differential input Current mirror (biasing) Composite pnp transistor A. Kruger Power + Output Stages36
37 Amplifier IC A. Kruger Power + Output Stages37
38 A. Kruger Power + Output Stages38
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