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LT8304 - 100VIN Micropower No-Opto Isolated Flyback ...

LT8304 / LT8304 -118304faFor more information APPLICATION FEATURESDESCRIPTION100 VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A SwitchThe LT 8304/ LT8304 -1 are monolithic Micropower iso-lated Flyback converters. By sampling the Isolated output voltage directly from the primary-side Flyback waveform, the parts require no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature com-pensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple.

n Low Quiescent Current: n 116µA in Sleep Mode n 390µA in Active Mode n Quasi-Resonant Boundary Mode Operation at Heavy Load n Low Ripple Burst Mode® Operation at Light Load n Minimum Load < 0.5% (Typ) of Full Output n No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation n Accurate EN/UVLO Threshold and Hysteresis

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Transcription of LT8304 - 100VIN Micropower No-Opto Isolated Flyback ...

1 LT8304 / LT8304 -118304faFor more information APPLICATION FEATURESDESCRIPTION100 VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A SwitchThe LT 8304/ LT8304 -1 are monolithic Micropower iso-lated Flyback converters. By sampling the Isolated output voltage directly from the primary-side Flyback waveform, the parts require no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature com-pensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple.

2 A 2A, 150V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO LT8304 / LT8304 -1 operate from an input voltage range of 3V to 100V and deliver up to 24W of Isolated output power. The high level of integration and the use of boundary and low ripple Burst Mode operation result in a simple to use, low component count, and high efficiency applica-tion solution for Isolated power delivery. The LT8304 -1 is specially optimized for high step-up output to 80 VIN/5 VOUT Isolated Flyback ConverterAPPLICATIONS n3V to 100V Input Voltage Range n2A, 150V Internal DMOS Power Switch nLow Quiescent current .

3 N116 A in Sleep Mode n390 A in Active Mode nQuasi- resonant Boundary Mode Operation at Heavy Load nLow Ripple Burst Mode Operation at Light Load nMinimum Load < (Typ) of Full Output nNo Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation nAccurate EN/UVLO Threshold and Hysteresis nInternal Compensation and Soft-Start nTemperature Compensation for Output Diode nOutput Short-Circuit Protection nThermally Enhanced 8-Lead SO Package nIsolated Automotive, Industrial, Medical, Telecom Power Supplies nIsolated Auxiliary/Housekeeping Power SuppliesL, LT, LT C, LT M, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation.

4 All other trademarks are the property of their respective owners. Protected by Patents, including 5438499, 7463497, vs Load CurrentVINLT8304SW40 HVIN4V TO 80V6 HRFBRREFEN/UVLO220pF10 F1 F100 F 320mA TO (VIN = 24V)20mA TO (VIN = 48V)20mA TO (VIN = 72V)VOUT 100 309k 100k10k8304 TA01aGNDINTVCCTCVOUT+5 VLOAD current (A) (%)8304 TA01bVIN = 24 VVIN = 48 VVIN = 72 VLT8304/ LT8304 -128304faFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSSW (Note 2) ..150 VVIN ..100 VEN/UVLO ..VINRFB ..VIN to VINC urrent Into RFB ..200 AINTVCC, RREF, TC ..4 VOperating Junction Temperature TJ Range (Notes 3, 4) LT830 4E/ LT8 30 4E -1 .. 40 C to 125 C LT830 4I/ LT8 30 4I-1.

5 40 C to 125 C LT830 4H/ LT8 30 4H -1 .. 40 C to 150 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) ..300 C (Note 1)12348765 TOP VIEWTCRREFRFBSWEN/UVLOINTVCCVINGNDS8E PACKAGE8-LEAD PLASTIC SO9 GND JA = 33 C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT8304ES8E#PBFLT8304ES8E#TRPBF83048 -Lead Plastic SO 40 C to 125 CLT8304IS8E#PBFLT8304IS8E#TRPBF83048-Lea d Plastic SO 40 C to 125 CLT8304HS8E#PBFLT8304HS8E#TRPBF83048-Lea d Plastic SO 40 C to 150 CLT8304ES8E-1#PBFLT8304ES8E-1#TRPBF83041 8-Lead Plastic SO 40 C to 125 CLT8304IS8E-1#PBFLT8304IS8I-1#TRPBF83041 8-Lead Plastic SO 40 C to 125 CLT8304HS8E-1#PBFLT8304HS8E-1#TRPBF83041 8-Lead Plastic SO 40 C to 150 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

6 *The temperature grade is identified by a label on the shipping container For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF #orderinfoLT8304/ LT8304 -138304faFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VIN = 24V, VEN/UVLO = VIN, CINTVCC = 1 F to GND, unless otherwise Voltage Rangel3100 VIQVIN Quiescent CurrentVEN/UVLO = VEN/UVLO = Sleep Mode (Switch Off) Active Mode (Switch On) 63 116 3903 A A A AEN/UVLO Shutdown ThresholdFor Lowest Off Enable Enable Hysteresis14mVIHYSEN/UVLO Hysteresis CurrentVEN/UVLO = VEN/UVLO = VEN/UVLO = A A AVINTVCCINTVCC Regulation VoltageIINTVCC = 0mA to current LimitVINTVCC = UVLO UVLO Hysteresis105mV(RFB VIN) VoltageIRFB = 75 A to 125 A 6060mVRREF Regulation Regulation Voltage Line Regulation3V VIN Pin Pin CurrentVTC = ( LT8304 ) VTC = ( LT8304 -1)

7 VTC = 715 10 20018 13 A A AfMAXM aximum Switching Frequencyl315350385kHzfMINM inimum Switching Frequency81114kHztON(MIN)Minimum Switch-On Time( LT8304 ) ( LT8304 -1)160 950ns nsISW(MAX)Maximum Switch current (MIN)Minimum Switch current (ON)Switch On-ResistanceISW = ILKGS witch Leakage CurrentVSW = AtSSSoft-Start Timer11msNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The SW pin is rated to 150V for transients. Depending on the leakage inductance voltage spike, operating waveforms of the SW pin should be derated to keep the Flyback voltage spike below 150V as shown in Figure 3: The LT8304E/LT8304E-1 are guaranteed to meet performance specifications from 0 C to 125 C junction temperature.

8 Specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT8304I/LT8304I-1 are guaranteed over the full 40 C to 125 C operating junction temperature range. LT8304H/LT304H-1 are guaranteed over the full 40 C to 150 C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperature greater than 125 4: The LT8304 / LT8304 -1 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 150 C when overtemperature protection is active.

9 Continuous operation above the specified maximum operating junction temperature may impair device more information PERFORMANCE CHARACTERISTICSB oundary Mode WaveformsDiscontinuous Mode WaveformsBurst Mode Operation WaveformsVIN Shutdown CurrentVIN Quiescent current , Sleep ModeVIN Quiescent current , Active ModeOutput Load and Line RegulationOutput Temperature VariationSwitching Frequency vs Load CurrentTA = 25 C, unless otherwise current (A) VOLTAGE (V)8304 G01 FRONT PAGE APPLICATIONVIN = 24 VVIN = 48 VVIN = 72 VTEMPERATURE ( ) 50 VOLTAGE (V)8304 G02 FRONT PAGE APPLICATIONVIN = 48 VIOUT = 1 ARTC = 100kRTC = OPENLOAD current (A) (kHz)8304 G03 FRONT PAGE APPLICATIONVIN = 24 VVIN = 48 VVIN = 72 VVSW50V/DIVVOUT50mV/DIV2 s/DIVFRONT PAGE APPLICATIONVIN = 48 VIOUT = 3A8304 G04 VSW50V/DIVVOUT50mV/DIV2 s/DIVFRONT PAGE APPLICATIONVIN = 48 VIOUT = G05 VSW50V/DIVVOUT50mV/DIV20 s/DIVFRONT PAGE APPLICATIONVIN = 48 VIOUT = 20mA8304 G06TJ = 150 CTJ = 25 CTJ = 50 CVIN (V)0204060801000246810IQ ( A)IN8304 G07TJ = 150 CTJ = 25 CTJ = 50 CVIN (V)02040608010090100110120130140150IQ ( A)Sleep Mode8304 G08TJ = 150 CTJ = 25 CTJ = 50 CVIN (V)020406080100350370390410430450IQ ( A)

10 Active Mode8304 G09LT8304/ LT8304 -158304faFor more information PERFORMANCE CHARACTERISTICSINTVCC Voltage vs VININTVCC UVLO Threshold (RFB VIN) VoltageRREF Regulation VoltageRREF Line RegulationTC Pin VoltageEN/UVLO Enable ThresholdEN/UVLO Hysteresis CurrentINTVCC Voltage vs TemperatureTA = 25 C, unless otherwise ( C) 50 (V)EN/UVLO Enable Threshold8304 G10 TEMPERATURE ( C) 50 250255075100125150012345 IHYST ( A)EN/UVLO Hysteresis Current8304 G11 IINTVCC = 0mAIINTVCC = 10mATEMPERATURE ( C) 50 (V)CC8304 G12 IINTVCC = 0mAIINTVCC = 10mAVIN (V) (V)CCIN8304 G13 RISINGFALLINGTEMPERATURE ( C) 50 (V)INTVCC UVLO Threshold8304 G14 IRFB = 125 AIRFB = 100 AIRFB = 75 ATEMPERATURE ( C) 50 250255075100125150 40 30 20 10010203040 VOLTAGE (mV)(RFB - VIN) Voltage8304 G15 TEMPERATURE ( C) 50 (V)RREF Regulation Voltage8304 G16 VIN (V) (V)RREF Line Regulation8304 G17 TEMPERATURE ( C) 50 (V)TC Pin Voltage8304 G18LT8304/ LT8304 -168304faFor more information Switching FrequencyMinimum Switch-On TimeMinimum Switch-Off TimeRDS(ON)Switch current LimitMaximum Switching FrequencyTYPICAL PERFORMANCE CHARACTERISTICSTA = 25 C, unless otherwise ( C) 50 ( )DS(ON)8304 G19 TEMPERATURE ( C) 50 (A)8304 G20 MAXIMUM current LIMITMINIMUM current LIMITTEMPERATURE ( C)


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