模电模电邓天平ch15-4edit

1、Huazhong University of Science and TechnologyThe Department of Electronics and Information EngineeringFirst Term 09/10Electronic Circuit Analysis and DesignDr. Tianping DengEmail: PART 1SEMICONDUCTOR DEVICES AND BASIC APPLICATIONSChapter 1Semiconductor Materials and DiodesChapter 2Diode CircuitsChap

2、ter 3The Field-Effect TransistorChapter 4Basic FET AmplifiersChapter 5The Bipolar Junction TransistorChapter 6Basic BJT AmplifiersChapter 7Frequency ResponseChapter 8Output Stages and Power AmplifiersPART 2ANALOG ELECTRONICSChapter 9Ideal Operational Amplifiers and Op-Amp CircuitsChapter 10Integrate

3、d Circuit Biasing and Active LoadsChapter 11Differential and Multistage AmplifiersChapter 12Feedback and StabilityChapter 13Operational Amplifier CircuitsChapter 14Nonideal Effects in Operational Amplifier CircuitsChapter 15Applications and Design of Integrated CircuitsContentsChapter 15Applications

4、 and Design of Integrated CircuitsCh15 Applications and Designs of IC15.0 Preview15.1 Active Filters15.2 Sinusoidal Oscillators15.3 Nonsinusoidal Oscillators15.4 Voltage Regulators15.4 Voltage Regulators15.4 Voltage Regulators15.4.1 Basic Regulator Description15.4.2 Series-Pass Regulator15.4.3 Integ

5、rated Three-Terminal Voltage Regulator15.4.0 ReviewSome Examples Block diagram of an electronic power supply15.4.0 Reviewv2vLt2340Not consider the forward voltage of the diode.15.4.0 ReviewThe average value of VL:()=LLtdvV2021wThe average value of IL:VL20t()=pwp 01tdvVLL=()pwp 01tdsinw t22V=p229.02V

6、V=2IL= VL /RL =0.9 V2 / RL 15.4.0 ReviewThe average value of ID:15.4.0 Reviewu2tiDtuc= uLif d （3 5） ，VL = ( 1.1 1.2 )V2Block diagram of an electronic power supplyTwo question we must consider:1、The input AC voltage will fluctuate, always 10%.2、The value of the load will change.15.4 Voltage Regulator

7、s15.4.1. Basic Regulator Description1. Block Diagram of a Voltage RegulatorVoltage regulator consists of four parts.15.4.1 Basic Regulator Description2. The figures of merit Line regulation Output resistance Load regulation V+ supply voltage Rof is positive, negative sign means that IO produces VO V

8、O(NL) is zero-load, VO(FL) is full-load15.4.2 Series-Pass Regulator1. Simple Series-Pass Regulator Error Amp is comparator T1 and T2 are Darlington Output feedback is a shunt connection, Rof es smaller, Vo es more stable.15.4.2 Series-Pass Regulator1. The Structure15.4.2 Series-Pass Regulator2. The

9、OperatingChange in vIChange in IOChange in vOSeries-Shunt configurationOutput Voltage(+)(+)(+)(+)15.4.3 Integrated Three-Terminal Voltage Regulator1. Positive voltage regulator 78Current sourceRef VoltageCurrent ampcomparatorCurrent limitingThermal protectionStartupFeedback15.4.3 Integrated Three-Te

10、rminal Voltage Regulator2. ApplicationCin is compensating capacitor to prevent high frequency noise.Co may improve the response of the regulator.a. Basic Application123+_78LXXVI+_Vo132C10.11FC21F7810(+10V), 7805(+5V)7905(-5V), 7910(-10V)15.4.3 Integrated Three-Terminal Voltage Regulator15.4.3 Integr

11、ated Three-Terminal Voltage Regulatorb. Multiplying output currentIf Then 15.4.3 Integrated Three-Terminal Voltage Regulatorc. Varying output voltageWe can get When R2 is varied, the range of output voltage is changed.Application circuit:(1) The RMS value of the secondary of the transformer V2=20V,

12、determine the value of VI.(2) explain the function of the T1,R1,DZ2;(3) If the arrow in the middle and no load ,when VZ1=6V,VREF=0.7V, calculate the value of VA, VB, VC, VD,VE and VCE3.(4) Determine the value range of the output voltage VO;(5) when VO=12V,RL=150, R2=510 , calculate the power consumption of PC3.EXAMPLE 1EXAMPLE 1(3) If the arrow in the middle and no loa