Amplifier and Data Converter Selection Guide (Rev. B

More documents

Recommendations

Info

44 Amplifiers➔Pulse Width Modulation Power DriversTI’s pulse width modulation (PWM) powerdrivers are specifically designed for applicationsrequiring high current at low to moderatelyhigh voltages, ranging from 5V to 60V.Loads include electromechanical loads, suchas solenoids, coils, actuators, and relays, aswell as heaters, lamps, thermoelectriccoolers and laser diode pumps.These products feature integrated powertransistors, which save considerablecircuit board area compared to discreteimplementations. Unlike the operation oflinear drivers, PWM operation offersefficiencies as great as 90%, resulting in lesspower wasted as heat and reduced demandon the power supply. The DRV10x operatesfrom +8V to +60V and has a single low-sideor high-side power switch. The devices in theDRV59x family may be analog or digitallycontrolled and operate from 0% to 100%duty cycles. The DRV59x operates on +2.8Vto +5.5V and has internal H-bridge outputswitches in series with the load, allowing forbi-directional current flow from a singlepower supply.Design ConsiderationsSupply voltage—selection begins with thepower supply voltages available in thesystem. TI’s families of PWM power driversoperate from 2.8V to 5.5V for the DRV59x familyand from 2.8V to 60V for the DRV10x family.Output current and output voltage—the loadto be connected to the power driver will alsoInputOnOffDRV103DelayDelayAdjC DThermal ShutdownOver CurrentV REFOsc FreqAdjR FREQhelp determine the proper PWM power driversolution. The maximum output currentrequired by the load should be known. Themaximum output voltage capability of thedriver may be calculated as follows:V O (max) = V S – [ I O (max) • 2 • R DS(ON) ]Efficiency—a lower on-resistance (R ON ) ofthe output power transistors will yieldgreater efficiency. Typically, R DS(ON) isspecified per transistor. In an H-bridge outputconfiguration, two output transistors are inseries with the load. To quickly estimate theefficiency, use the following equation:Efficiency = R L / [ R L + ( 2 • R DS(ON) ) ]OscillatorPWMAnalog or digital control—TI offers bothH-bridge and single-sided drivers. TheDRV590, DRV591, DRV593 and DRV594 eachaccept a DC voltage input signal, either froman analog control loop (i.e., PID controller) orStatus OKFlagDuty CycleAdjR PWMDMOSDMOSDRV103 low-side PWM driver block diagram.+V SESDOUTGNDFlybackDiodeCoilCoolerHeaterLampfrom a DAC, while the DRV592 accepts aPWM input signal.Output filter—in some applications, a lowpassfilter is placed between each output ofthe PWM driver and the load to remove theswitching frequency components. A secondorderfilter consisting of an inductor andcapacitor is commonly used, with the cut-offfrequency of the filter typically chosen to beat least an order of magnitude lower than theswitching frequency. For example, a DRV593switching at 500kHz can have a 15.9kHzcut-off frequency. The component values arecalculated using the following formula:FC = 1 / [ 2 •π• (√(L • C) ) ]The inductor value is typically chosen to beas large as possible, and is then used tocalculate the required capacitor value for thedesired cut-off frequency.PWM Power Drivers Selection GuideSupply Voltage Output Current Saturation Voltage R ON FrequencyDevice Description (V) (A) (typ) (V) (Ω) (kHz) Package(s) Price *Single SwitchDRV101 Low-Side with Internal Monitoring 9 to 60 2.3 1 0.8 24 TO-220, DDPAK $3.85DRV102 High-Side with Internal Monitoring 8 to 60 2.7 2.2 0.95 24 TO-220, DDPAK $3.85DRV103 Low-Side with Internal Monitoring 8 to 32 1.5/3 0.6 0.9 0.5 to 100 SOIC-8, SOIC-8 PowerPAD $1.60DRV104 High-Side with Internal Monitoring 8 to 32 1.2 0.65 0.45 0.5 to 100 HTSSOP-14 PowerPAD $1.60BridgeDRV590 1.2A, High-Efficiency PWM Power Driver 2.7 to 5.5 1.2 0.48 0.4 250/500 SOIC-PowerPAD, 4x4mm $7.30MicroStar JuniorDRV591 ±3A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 9x9 PowerPAD QFP $6.30DRV592 ±3A, High-Efficiency H-Bridge 2.8 to 5.5 3 0.195 0.065 1000 9x9 PowerPAD QFP $12.50DRV593 ±3A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 9x9 PowerPAD QFP $5.90DRV594 ±3A, High-Efficiency PWM Power Driver 2.8 to 5.5 3 0.195 0.065 100/500 9x9 PowerPAD QFP $5.90Sensor Signal ConditioningDRV401 Signal Cond. for Magnetic Current Sensor 4.5 to 5.5 0.2 0.4 — 2000 QFN-20, SOIC-20 $1.90* Suggested resale price in U.S. dollars in quantities of 1,000. New products are listed in bold red.Amplifier and Data Converter Selection Guide Texas Instruments 3Q 2007
AmplifiersSensor Conditioners and 4-20mA Transmitters45➔The PGA309 is a complete voltage outputbridge sensor conditioner that eliminatespotentiometers and sensor trims. Span andOffset are digitally calibrated with temperaturecoefficients stored in a low-cost, SOT23-5,external EEPROM. Excitation voltagelinearization, internal/external temperaturemonitoring and selection of internal/externalvoltage references including supply areprovided. Over/Under scale limits are settableand fault detection circuitry is included.The 4-20mA transmitter provides a versatileinstrumentation amplifier (IA) input with acurrent-loop output, allowing analog signalsto be sent over long distances without loss ofaccuracy. Many of these devices also includescaling, offsetting, sensor excitation andlinearization circuitry. The XTR108 provides adigitally controlled analog signal path for RTD signalconditioning. The XTR108 allows for digitalcalibration of sensor and transmitter errorsvia a standard digital serial interface,eliminating expensive potentiometers orcircuit value changes. Calibration settingscan be stored in an inexpensive externalEEPROM for easy retrieval during routineoperation.RTDXTR4-20mA4-20mA transmitter design solutions.V LOOPFaultMonitorV EXCDigital TemperatureCompensationExt TempLinearizationCircuitAnalog Sensor LinearizationAuto-ZeroPGAIntTempV STempADCOver/UnderScale LimiterRefLinearizationDACAnalog Signal ConditioningControl RegisterInterface CircuitryV SLinear V OUTDIGITAL CALEEPROM(SOT23-5)PGA309 Key Features• Voltage output: ratiometric or absolute• Digital calibration: no potentiometers, nosensor trim• Sensor compensation: span and span drift,offset and offset drift•
Page 6 and 7: 6 Amplifiers➔Texas Instruments (T
Page 8 and 9: 8Amplifiers➔Precision Operational
Page 10 and 11: 10 Amplifiers➔Precision Operation
Page 12 and 13: 12➔AmplifiersPrecision Operationa
Page 14 and 15: 14AmplifiersPrecision Operational A
Page 16 and 17: 16Amplifiers➔High-Speed Amplifier
Page 18 and 19: 18➔AmplifiersHigh-Speed Amplifier
Page 20 and 21: 20 Amplifiers➔Video AmplifiersVid
Page 22 and 23: 22Amplifiers➔Video AmplifiersVide
Page 24 and 25: 24➔AmplifiersComparatorsLow-Power
Page 26 and 27: 26 Amplifiers➔Difference Amplifie
Page 28 and 29: 28 Amplifiers➔Analog Current Shun
Page 30 and 31: 30 Amplifiers➔Instrumentation Amp
Page 32 and 33: 32➔AmplifiersSingle-Supply Instru
Page 34 and 35: 34 Amplifiers➔Programmable Gain A
Page 36 and 37: 36➔AmplifiersVoltage-Controlled G
Page 38 and 39: 38➔AmplifiersAudio AmplifiersPure
Page 40 and 41: 40Amplifiers➔Audio Power Amplifie
Page 42 and 43: 42 Amplifiers➔Power Amplifiers an
Page 46 and 47: 46➔AmplifiersSensor Conditioners
Page 48 and 49: 48 Amplifiers➔Integrating Amplifi
Page 50 and 51: 50 Amplifiers➔Amplifiers for Driv
Page 52 and 53: 52 ADCs by Architecture➔Delta-Sig
Page 54 and 55: 54➔ADCs by ArchitectureDelta-Sigm
Page 56 and 57: 56 ADCs by Architecture➔Wide Band
Page 58 and 59: 58 ADCs by Architecture➔SAR ADCsS
Page 60 and 61: 60ADCs by Architecture➔SAR ADCs18
Page 62 and 63: 62➔ADCs by ArchitectureSuccessive
Page 64 and 65: 64 ADCs by Architecture➔Pipeline
Page 66 and 67: 66➔ADCs by ArchitecturePipeline A
Page 68 and 69: 68➔ADCs by ArchitecturePipeline A
Page 70 and 71: 70➔DACs by ArchitectureHigh-Accur
Page 72 and 73: 72DACs by Architecture➔High-Accur
Page 74 and 75: 74DACs by Architecture➔High-Accur
Page 76 and 77: 76DACs by Architecture➔Current St
Page 78 and 79: 78➔Analog Monitoring and ControlA
Page 80 and 81: 80 Analog Monitoring and Control➔
Page 82 and 83: 82Voltage References➔ Voltage Ref
Page 84 and 85: 84➔Temperature SensorsTemperature
Page 86 and 87: 86Quick Reference Selection TableAD
Page 94 and 95:
94Quick Reference Selection TableDA
Page 96 and 97:
96Quick Reference Selection TableDA
Page 98 and 99:
98Quick Reference Audio Selection T
Page 100 and 101:
100Quick Reference Audio Selection
Page 102 and 103:
102➔Design and Evaluation ToolsFi
Page 104 and 105:
104➔Design and Evaluation ToolsSi
Page 106 and 107:
106➔Design and Evaluation ToolsEv
Page 108 and 109:
108➔Design and Evaluation ToolsDa
Page 110 and 111:
110➔Design and Evaluation ToolsDa
Page 112 and 113:
112➔Design and Evaluation ToolsAm
Page 114 and 115:
114➔Design and Evaluation ToolsAp
Page 116 and 117:
116Device Index➔DevicePageDAC7643
Page 118 and 119:
118Device Index➔DevicePageTLV2544
Page 120 and 121:
Texas Instruments Incorporated14950
show all

Amplifier and Data Converter Selection Guide (Rev. B

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?