LT8302/LT8302-3 (Rev. G) - Analog Devices
LT8302/LT8302-342VIN Micropower No-OptoIsolated Flyback Converterwith 65V/3.6A SwitchFEATURESnnnnnnnnnnnnnDESCRIPTION3V to 42V Input Voltage Range3.6A, 65V Internal DMOS Power SwitchLow Quiescent Current:n 106µA in Sleep Moden 380µA in Active ModeQuasi-Resonant Boundary Mode Operation atHeavy LoadLow Ripple Burst Mode Operation at Light LoadMinimum Load 0.5% (Typ) of Full OutputNo Transformer Third Winding or Opto-IsolatorRequired for Output Voltage RegulationAccurate EN/UVLO Threshold and HysteresisInternal Compensation and Soft-StartTemperature Compensation for Output DiodeOutput Short-Circuit ProtectionThermally Enhanced 8-Lead SO PackageAEC-Q100 Qualified for Automotive ApplicationsAPPLICATIONSnnIsolated Automotive, Industrial, MedicalPower SuppliesIsolated Auxiliary/Housekeeping Power SuppliesThe LT 8302/LT8302-3 is a monolithic micropower isolated flyback converter. By sampling the isolated outputvoltage directly from the primary-side flyback waveform,the part requires no third winding or opto-isolator forregulation. The output voltage is programmed with twoexternal resistors and a third optional temperature compensation resistor. Boundary mode operation provides asmall magnetic solution with excellent load regulation.Low ripple Burst Mode operation maintains high efficiencyat light load while minimizing the output voltage ripple. A3.6A, 65V DMOS power switch is integrated along with allthe high voltage circuitry and control logic into a thermallyenhanced 8-lead SO package.The LT8302/LT8302-3 operates from an input voltagerange of 3V to 42V and delivers up to 18W of isolatedoutput power. The high level of integration and the use ofboundary and low ripple burst modes result in a simple touse, low component count, and high efficiency applicationsolution for isolated power delivery.All registered trademarks and trademarks are the property of their respective owners. Protectedby U.S. patents, including 5438499, 7463497, 7471522.TYPICAL APPLICATION3V to 32VIN/5VOUT Isolated Flyback 2-3GND1µFINTVCC9µH1µHVOUT–10mA TO 1.1A (VIN 5V)10mA TO 2.0A (VIN 12V)10mA TO 2.9A (VIN 24V)RREF115k85220µF154kRFBTC 90VOUT 5V10kEFFICIENCY (%)VIN3V TO 32VEfficiency vs Load Current807570VIN 5VVIN 12VVIN 24V658302 TA01a6000.52.01.51.0LOAD CURRENT (A)2.53.08302 TA01bRev. GDocument FeedbackFor more information www.analog.com1
LT8302/LT8302-3ABSOLUTE MAXIMUM RATINGSPIN CONFIGURATION(Note 1)SW (Note 2).65VVIN.42VEN/UVLO.VINRFB.VIN – 0.5V to VINCurrent Into RFB.200µAINTVCC, RREF, TC.4VOperating Junction Temperature Range (Notes 3, 4)LT8302E, LT8302E-3. –40 C to 125 CLT8302I, LT8302I-3. –40 C to 125 CLT8302J, LT8302J-3. –40 C to 150 CLT8302H, LT8302H-3. –40 C to 150 CLT8302MP. –55 C to 150 CStorage Temperature Range. –65 C to 150 CLead Temperature (Soldering, 10 sec). 300 CTOP VIEWEN/UVLO 18TCINTVCC 27RREF6RFB5SWVIN 39GNDGND 4S8E PACKAGE8-LEAD PLASTIC SOθJA 33 C/WEXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT8302ES8E#PBFLT8302ES8E#TRPBF83028-Lead Plastic SO–40 C to 125 CLT8302IS8E#PBFLT8302IS8E#TRPBF83028-Lead Plastic SO–40 C to 125 CLT8302JS8E#PBFLT8302JS8E#TRPBF83028-Lead Plastic SO–40 C to 150 CLT8302HS8E#PBFLT8302HS8E#TRPBF83028-Lead Plastic SO–40 C to 150 CLT8302MPS8E#PBFLT8302MPS8E#TRPBF83028-Lead Plastic SO–55 C to 150 CLT8302ES8E-3#PBFLT8302ES8E-3#TRPBF830238-Lead Plastic SO–40 C to 125 CLT8302IS8E-3#PBFLT8302IS8E-3#TRPBF830238-Lead Plastic SO–40 C to 125 CLT8302JS8E-3#PBFLT8302JS8E-3#TRPBF830238-Lead Plastic SO–40 C to 150 CLT8302HS8E-3#PBFLT8302HS8E-3#TRPBF830238-Lead Plastic SO–40 C to 150 CLT8302ES8E#WPBFLT8302ES8E#WTRPBF83028-Lead Plastic SO–40 C to 125 CLT8302IS8E#WPBFLT8302IS8E#WTRPBF83028-Lead Plastic SO–40 C to 125 CLT8302JS8E#WPBFLT8302JS8E#WTRPBF83028-Lead Plastic SO–40 C to 150 CLT8302HS8E#WPBFLT8302HS8E#WTRPBF83028-Lead Plastic SO–40 C to 150 CLT8302ES8E-3#WPBFLT8302ES8E-3#WTRPBF830238-Lead Plastic SO–40 C to 125 CLT8302IS8E-3#WPBFLT8302IS8E-3#WTRPBF830238-Lead Plastic SO–40 C to 125 CLT8302JS8E-3#WPBFLT8302JS8E-3#WTRPBF830238-Lead Plastic SO–40 C to 150 CLT8302HS8E-3#WPBFLT8302HS8E-3#WTRPBF830238-Lead Plastic SO–40 C to 150 CAUTOMOTIVE PRODUCTS**Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Thesemodels are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact yourlocal Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports forthese models.2Rev. GFor more information www.analog.com
LT8302/LT8302-3ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA 25 C. VIN 5V, VEN/UVLO VIN, CINTVCC 1µF to GND, unless otherwise noted.SYMBOLPARAMETERVINVIN Voltage RangeIQVIN Quiescent CurrentCONDITIONSMINlTYP3VEN/UVLO 0.2VVEN/UVLO 1.1VSleep Mode (Switch Off)Active Mode (Switch On)0.553106380MAXUNIT42V2µAµAµAµAEN/UVLO Shutdown ThresholdFor Lowest Off IQl0.20.75EN/UVLO Enable ThresholdFalling (E, I, H, MP Grades)l1.1781.2141.250VEN/UVLO Enable ThresholdFalling (J Grade Only)l1.1601.2141.268VEN/UVLO Enable HysteresisV14mVIHYSEN/UVLO Hysteresis CurrentVEN/UVLO 0.3VVEN/UVLO 1.1VVEN/UVLO NTVCC Regulation VoltageIINTVCC 0mA to 10mA2.8533.1VINTVCC Current LimitVINTVCC 2.8V101320mAINTVCC UVLO ThresholdFalling2.392.472.55IRFB 75µA to 125µA–50IINTVCCINTVCC UVLO Hysteresis(RFB – VIN) Voltage105RREF Regulation VoltageRREF Regulation Voltage Line Regulationl3V VIN 42V0.98–0.01VmV50mV1.001.02V00.01%/VVTCTC Pin Voltage1.00ITCTC Pin CurrentfMINMinimum Switching FrequencytON(MIN)Minimum Switch-On TimetOFF(MAX)Maximum Switch-Off TimeISW(MAX)Maximum Switch Current Limit3.64.55.4AISW(MIN)Minimum Switch Current Limit0.700.871.04AVTC 1.2V (LT8302)VTC 1.2V (LT8302-3)VTC kup Timer170RDS(ON)Switch On-ResistanceISW 1.5A80ILKGSwitch Leakage CurrentVSW 65V0.1tSSSoft-Start Timer11Note 1: Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMaximum Rating condition for extended periods may affect devicereliability and lifetime.Note 2: The SW pin is rated to 65V for transients. Depending on theleakage inductance voltage spike, operating waveforms of the SW pinshould be derated to keep the flyback voltage spike below 65V as shownin Figure 5.Note 3: The LT8302E/LT8302E-3 is guaranteed to meet performancespecifications from 0 C to 125 C junction temperature. Specificationsover the –40 C to 125 C operating junction temperature range areassured by design, characterization and correlation with statistical processnsµsmΩ0.5µAmscontrols. The LT8302I/LT8302I-3 is guaranteed over the full –40 C to125 C operating junction temperature range. The LT8302J/LT8302J-3and LT8302H/LT8302H-3 are guaranteed over the full –40 C to 150 Coperating junction temperature range. The LT8302MP is guaranteedover the full –55 C to 150 C operating junction temperature range. Highjunction temperatures degrade operating lifetimes. Operating lifetime isderated at junction temperature greater than 125 C.Note 4: The LT8302/LT8302-3 includes overtemperature protection thatis intended to protect the devices during momentary overload conditions.Junction temperature will exceed 150 C when overtemperature protectionis active. Continuous operation above the specified maximum operatingjunction temperature may impair device reliability.Rev. GFor more information www.analog.com3
LT8302/LT8302-3TYPICAL PERFORMANCE CHARACTERISTICSOutput Load and Line Regulation5.35.004.95VIN 5VVIN 12VVIN 24V4.800.501.02.01.5LOAD CURRENT (A)2.55.1RTC 115k5.0RTC OPEN4.94.7–50 –250VSW20V/DIVVOUT50mV/DIVVOUT50mV/DIV8302 G048302 G05VIN Quiescent Current,Active ModeTJ 150 CIQ (µA)110TJ –55 C30VIN (V)4050800102030VIN (V)40508302 G088302 G074TJ 25 C380TJ –55 C3603409020TJ 150 C400TJ 25 C100108302 G0620µs/DIVFRONT PAGE APPLICATIONVIN 12VIOUT 10mA12003.0420130IQ (µA)IQ (µA)02.5VOUT50mV/DIV140TJ 150 CTJ 25 CTJ –55 C22.01.01.5LOAD CURRENT (A)Burst Mode WaveformsVIN Quiescent Current,Sleep Mode40.5VSW20V/DIV2µs/DIVFRONT PAGE APPLICATIONVIN 12VIOUT 0.5AVIN Shutdown Current608302 G03Discontinuous Mode WaveformsVSW20V/DIV8VIN 5VVIN 12VVIN 24V8302 G02Boundary Mode Waveforms10200025 50 75 100 125 150TEMPERATURE ( C)8302 G012µs/DIVFRONT PAGE APPLICATIONVIN 12VIOUT 2A3001004.83.0FRONT PAGE APPLICATION400FREQUENCY (kHz)5.05500FRONT PAGE APPLICATIONVIN 12VIOUT 1A5.25.10OUTPUT VOLTAGE (V)OUTPUT VOLTAGE (V)5.154.85Switching Frequencyvs Load CurrentOutput Temperature Variation5.204.90TA 25 C, unless otherwise noted.3200102030VIN (V)40508302 G09Rev. GFor more information www.analog.com
LT8302/LT8302-3TYPICAL PERFORMANCE CHARACTERISTICSEN/UVLO Enable ThresholdTA 25 C, unless otherwise noted.EN/UVLO Hysteresis Current1.240INTVCC Voltage vs Temperature5RISINGIHYST (µA)VEN/UVLO CC (V)1.2353.10210IINTVCC 10mA2.850–50 –2525 50 75 100 125 150TEMPERATURE ( C)2.952.901.2051.200–50 –25IINTVCC 0mA02.80–50 –2525 5075 100 125 150TEMPERATURE ( C)8302 G10025 50 75 100 125 150TEMPERATURE ( C)8302 G128302 G11INTVCC Voltage vs VININTVCC UVLO Threshold3.102.83.052.7(RFB-VIN) Voltage4030IRFB 125µA2.6IINTVCC 0mA2.95VINTVCC (V)VINTVCC (V)3.00IINTVCC 10mARISING2.52.902.42.852.3VOLTAGE (mV)20FALLING10IRFB 100µA0–10–202.80510152025 30VIN (V)3540–302.2–50 –25450RREF Line RegulationTC Pin 31.2VTC (V)VRREF (V)VRREF 992025 50 75 100 125 150TEMPERATURE ( C)25 50 75 100 125 150TEMPERATURE ( C)8302 G151.0101.00008302 G14RREF Regulation Voltage0.990–50 –25–40–50 –2525 50 75 100 125 150TEMPERATURE ( C)8302 G131.010IRFB 75µA0.9901.11.00.90.80102030VIN (V)408302 G16508302 G170.7–50 –25025 50 75 100 125 150TEMPERATURE ( C)8302 G18Rev. GFor more information www.analog.com5
LT8302/LT8302-3TYPICAL PERFORMANCE CHARACTERISTICSSwitch Current Limit5160412038040MAXIMUM CURRENT LIMIT0MINIMUM CURRENT LIMIT0–50 –2525 5075 100 125 150TEMPERATURE ( C)0Minimum Switching Frequency25 5075 100 125 150TEMPERATURE ( C)4003003002000–50 –25200100025 50 75 100 125 150TEMPERATURE ( C)8302 G22625 5075 100 125 150TEMPERATURE ( C)Minimum Switch-Off Time400100008302 G21TIME (ns)TIME (ns)FREQUENCY (kHz)0–50 –250–50 –25Minimum Switch-On Time1642008302 G2020830010025 5075 100 125 150TEMPERATURE ( C)8302 G1912400210–50 –25Maximum Switching Frequency500FREQUENCY (kHz)200ISW (A)RESISTANCE (mΩ)RDS(ON)TA 25 C, unless otherwise noted.8302 G230–50 –25025 50 75 100 125 150TEMPERATURE ( C)8302 G24Rev. GFor more information www.analog.com
LT8302/LT8302-3PIN FUNCTIONSEN/UVLO (Pin 1): Enable/Undervoltage Lockout. TheEN/UVLO pin is used to enable the LT8302/LT8302-3.Pull the pin below 0.3V to shut down the LT8302/LT83023. This pin has an accurate 1.214V threshold and canbe used to program a VIN undervoltage lockout (UVLO)threshold using a resistor divider from VIN to ground. A2.5µA current hysteresis allows the programming of VINUVLO hysteresis. If neither function is used, tie this pindirectly to VIN.SW (Pin 5): Drain of the Internal DMOS Power Switch.Minimize trace area at this pin to reduce EMI and voltagespikes.INTVCC (Pin 2): Internal 3V Linear Regulator Output. TheINTVCC pin is supplied from VIN and powers the internal control circuitry and gate driver. Do not overdrive theINTVCC pin with any external supply, such as a third winding supply. Locally bypass this pin to ground with a minimum 1µF ceramic capacitor.RREF (Pin 7): Input Pin for External Ground ReferredReference Resistor. The resistor at this pin should be inthe range of 10k, but for convenience in selecting a resistor divider ratio, the value may range from 9.09k to 11.0k.VIN (Pin 3): Input Supply. The VIN pin supplies current tothe internal circuitry and serves as a reference voltage forthe feedback circuitry connected to the RFB pin. Locallybypass this pin to ground with a capacitor.GND (Pin 4, Exposed Pad Pin 9): Ground. The exposedpad provides both electrical contact to ground and goodthermal contact to the printed circuit board. Solder theexposed pad directly to the ground plane.RFB (Pin 6): Input Pin for External Feedback Resistor.Connect a resistor from this pin to the transformer primary SW pin. The ratio of the RFB resistor to the RREFresistor, times the internal voltage reference, determinesthe output voltage (plus the effect of any non-unity transformer turns ratio). Minimize trace area at this pin.TC (Pin 8): Output Voltage Temperature Compensation.The voltage at this pin is proportional to absolute temperature (PTAT) with temperature coefficient equal to3.35mV/ K, i.e., equal to 1V at room temperature 25 C.The TC pin voltage can be used to estimate the LT8302/LT8302-3 junction temperature. Connect a resistor fromthis pin to the RREF pin to compensate the output diodetemperature coefficient.Rev. GFor more information www.analog.com7
LT8302/LT8302-3BLOCK �1.214V TECTOR 1EN/UVLOCOUTSW25µAREN1L1BVINLDOCINTVCC VOUT 5RFBVININTVCC DOUTINTVCC–gm SA3RQM1DRIVER2.5µAPTATVOLTAGEM4 A2RSENSE–RREF7TCGND4, EXPOSED PAD PIN 98RTC8302 BDRREF8Rev. GFor more information www.analog.com
LT8302/LT8302-3OPERATIONThe LT8302/LT8302-3 is a current mode switching regulator IC designed specially for the isolated flyback topology.The key problem in isolated topologies is how to communicate the output voltage information from the isolatedsecondary side of the transformer to the primary sidefor regulation. Historically, opto-isolators or extra transformer windings communicate this information acrossthe isolation boundary. Opto-isolator circuits waste outputpower, and the extra components increase the cost andphysical size of the power supply. Opto-isolators can alsocause system issues due to limited dynamic response,nonlinearity, unit-to-unit variation and aging over lifetime. Circuits employing extra transformer windings alsoexhibit deficiencies, as using an extra winding adds tothe transformer’s physical size and cost, and dynamicresponse is often mediocre.The LT8302/LT8302-3 samples the isolated output voltagethrough the primary-side flyback pulse waveform. In thismanner, neither opto-isolator nor extra transformer winding is required for regulation. Since the LT8302/LT8302-3operates in either boundary conduction mode or discontinuous conduction mode, the output voltage is alwayssampled on the SW pin when the secondary current iszero. This method improves load regulation without theneed of external load compensation components.The LT8302/LT8302-3 is a simple to use micropower isolated flyback converter housed in a thermally enhanced8-lead SO package. The output voltage is programmedwith two external resistors. An optional TC resistorprovides easy output diode temperature compensation.By integrating the loop compensation and soft-startinside, the part reduces the number of external components. As shown in the Block Diagram, many of the blocksare similar to those found in traditional switching regulators including reference, regulators, oscillator, logic,current amplifier, current comparator, driver, and powerswitch. The novel sections include a flyback pulse sensecircuit, a sample-and-hold error amplifier, and a boundarymode detector, as well as the additional logic for boundaryconduction mode, discontinuous conduction mode, andlow ripple Burst Mode operation.Quasi-Resonant Boundary Mode OperationThe LT8302/LT8302-3 features quasi-resonant boundary conduction mode operation at heavy load, wherethe chip turns on the primary power switch when thesecondary current is zero and the SW rings to its valley.Boundary conduction mode is a variable frequency, variable peak-current switching scheme. The power switchturns on and the transformer primary current increasesuntil an internally controlled peak current limit. After thepower switch turns off, the voltage on the SW pin rises tothe output voltage multiplied by the primary-to-secondarytransformer turns ratio plus the input voltage. When thesecondary current through the output diode falls to zero,the SW pin voltage collapses and rings around VIN. Aboundary mode detector senses this event and turns thepower switch back on at its valley.Rev. GFor more information www.analog.com9
LT8302/LT8302-3OPERATIONBoundary conduction mode returns the secondary currentto zero every cycle, so parasitic resistive voltage dropsdo not cause load regulation errors. Boundary conduction mode also allows the use of smaller transformerscompared to continuous conduction mode and does notexhibit subharmonic oscillation.Discontinuous Conduction Mode OperationAs the load gets lighter, boundary conduction modeincreases the switching frequency and decreases theswitch peak current at the same ratio. Running at a higherswitching frequency up to several MHz increases switching and gate charge losses. To avoid this scenario, theLT8302/LT8302-3 has an additional internal oscillator,which clamps the maximum switching frequency to beless than 380kHz. Once the switching frequency hits theinternal frequency clamp, the part starts to delay the switchturn-on and operates in discontinuous conduction mode.Low Ripple Burst Mode OperationUnlike traditional flyback converters, the LT8302/LT8302-3 has to turn on and off at least for a minimumamount of time and with a minimum frequency to allowaccurate sampling of the output voltage. The inherent10minimum switch current limit and minimum switch-offtime are necessary to guarantee the correct operation ofspecific applications.As the load gets very light, the LT8302/LT8302-3 starts tofold back the switching frequency while keeping the minimum switch current limit. So the load current is able todecrease while still allowing minimum switch-off time forthe sample-and-hold error amplifier. Meanwhile, the partswitches between sleep mode and active mode, therebyreducing the effective quiescent current to improve lightload efficiency. In this condition, the LT8302/LT8302-3runs in low ripple Burst Mode operation. The typical12kHz minimum switching frequency determines howoften the output voltage is sampled and also the minimum load requirement.Difference Between LT8302 and LT8302-3The difference between LT8302 and LT8302-3 isthe boundary detection method. The LT8302 is using thedv/dt slope on RREF pin, while the LT8302-3 is using thevoltage level on RREF pin. For good transformers withlow leakage inductance, both the LT8302 and LT8302-3are behaving the same. The LT8302-3 is recommendedfor multiple-winding output applications due to its lowersensitivity to the noise on RREF pin.R
The LT 8302/LT8302-3 is a monolithic micropower iso-lated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with two external res
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NACE Rev. 1.1 (ISIC Rev. 3) codes are often linked with more than one NACE Rev. 2 (ISIC Rev. 4) code. For example, 323 NACE Rev. 1.1 is linked with 261, 263 and 264 NACE Rev. 2 codes; 261 NACE Rev. 2 is linked with only one part of 311, 312, 313, 321 and 323 NACE Rev. 1.1 codes. Thus, it is not possible to obtain full codes of NACE
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Writing Human Factors Plans & Reports for Medical Technology Development pReVIeW COpY This is a preview edition of an AAMI guidance document and is intended to allow potential purchasers to evaluate the content of the document before making a purchasing decision. For a complete copy of this AAMI document contact AAMI at 1- 77-2-22 or visit www.aami.org. PREVIEW COPY This is a preview edition .
