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Analog Devices LT8302 | Demoboard RD002
6 W Unipolar isolated auxiliary supply for SiC-MOSFET & IGBT gate driver
Overview
| Topology | Flyback Converter |
| Input voltage | 9-18 V |
| Switching frequency | 80-360 kHz |
| Output 1 | 20 V / 0.4 A |
Description
This reference design presents an auxiliary power supply providing a unipolar output voltage adjustable between 15 V and 20 V with a maximum output power of 6 W. The optimized design is for driving high-voltage SiC-MOSFET and IGBT discrete devices as well as power modules in high power converters. The output voltage range covers the requiremens of different devices, and the design can be easiliy integrated in the gate driver system. In addition to the compact size and high efficiency, one of the main features of the design is the extremely low interwinding capacitance of the WE-AGDT 750318114 transformer down to 6.8 pF, which helps to achieve high CMTI rating (Common-Mode Transient Immunity). A high CMTI enables faster switching transitions without compromising the functionality of the system, helping to achieve smaller system size and higher efficiency of the high power converter, as demanded by trending applications in areas like e-mobility, renewable energy and industrial automation.
Features
- 3V to 42V Input Voltage Range
- 3.6A, 65V Internal DMOS Power Switch
- Low Quiescent Current:
- 106µA in Sleep Mode
- 380µA in Active Mode
- Quasi-Resonant Boundary Mode Operation at Heavy Load
- Low Ripple Burst Mode® Operation at Light Load
- Minimum Load < 0.5% (Typ) of Full Output
- No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation
- Accurate EN/UVLO Threshold and Hysteresis
- Internal Compensation and Soft-Start
- Temperature Compensation for Output Diode
- Output Short-Circuit Protection
- Thermally Enhanced 8-Lead SO Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- Isolated Automotive, Industrial, Medical Power Supplies, Isolated Auxiliary/Housekeeping Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | VIN(V) | VOut1(V) | VOut2(V) | PO(W) | CWW 1(pF) | L(µH) | ISAT(A) | fswitch(kHz) | n | Version | IC Reference | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SPECWCAP-CSGP MLCCs 50 V(DC), 470 pF, ±10% | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance470 pF | Capacitance±10% | Rated Voltage50 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height0.8 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||||
SPECWCAP-CSGP MLCCs 50 V(DC), 1 µF, ±10% | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance1 µF | Capacitance±10% | Rated Voltage50 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor10 % | Insulation Resistance0.1 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||||
SPECWCAP-CSGP MLCCs 50 V(DC), 10 µF, ±10% | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance10 µF | Capacitance±10% | Rated Voltage50 V (DC) | Size1206 | Operating Temperature -55 °C up to +85 °C | Dissipation Factor10 % | Insulation Resistance0.005 GΩ | Ceramic TypeX5R Class II | Length3.2 mm | Width1.6 mm | Height1.6 mm | Pad Dimension0.6 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||||
 | SPECWE-AGDT Auxiliary Gate Drive Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | – | – | – | SizeEP7 | Operating Temperature -40 °C up to +130 °C | – | – | – | Length11.3 mm | Width10.95 mm | Height11.94 mm | – | – | Input Voltage 9 - 18 | Output Voltage 115 V | Output Voltage 2-4 V | Total Output Power6 W | Interwinding Capacitance7.5 pF | Inductance7 µH | Saturation Current5 A | Switching Frequency 350 | Turns Ratio2.25:3.5:1 | VersionFlyback | IC ReferenceLT8302 | –Check availability | |||
| SPECWE-AGDT Auxiliary Gate Drive Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | – | – | – | SizeEP7 | Operating Temperature -40 °C up to +130 °C | – | – | – | Length11.3 mm | Width10.95 mm | Height11.94 mm | – | – | Input Voltage 9 - 18 | Output Voltage 119 V | – | Total Output Power6 W | Interwinding Capacitance6.8 pF | Inductance6 µH | Saturation Current6.2 A | Switching Frequency 350 | Turns Ratio1:2 | VersionFlyback | IC ReferenceLT8302 | –Check availability | |||
| SPECWE-AGDT Auxiliary Gate Drive Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | – | – | – | SizeEP7 | Operating Temperature -40 °C up to +130 °C | – | – | – | Length11.3 mm | Width10.95 mm | Height11.94 mm | – | – | Input Voltage 9 - 18 | Output Voltage 119 V | Output Voltage 24 V | Total Output Power6 W | Interwinding Capacitance7.5 pF | Inductance7 µH | Saturation Current4.5 A | Switching Frequency 350 | Turns Ratio2.25:4.25:1 | VersionFlyback | IC ReferenceLT8302 | –Check availability | |||
| SPECWE-AGDT Auxiliary Gate Drive Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | – | – | – | SizeEP7 | Operating Temperature -40 °C up to +130 °C | – | – | – | Length11.3 mm | Width10.95 mm | Height11.94 mm | – | – | Input Voltage 9 - 18 | Output Voltage 120 V | Output Voltage 25 V | Total Output Power6 W | Interwinding Capacitance7.3 pF | Inductance7 µH | Saturation Current4.5 A | Switching Frequency 350 | Turns Ratio1.8:3.6:1 | VersionFlyback | IC ReferenceLT8302 | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
––– weeks
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |
There is no forecast for this quantity request.
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