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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 | 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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012207084 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 470 pF | ±10% | 50 | 0805 | -55 °C up to +125 °C | 2.5 | 10 GΩ | X7R Class II | 2 | 1.25 | 0.8 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012207103 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 1 µF | ±10% | 50 | 0805 | -55 °C up to +125 °C | 10 | 0.1 GΩ | X7R Class II | 2 | 1.25 | 1.25 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012108022 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 10 µF | ±10% | 50 | 1206 | -55 °C up to +85 °C | 10 | 0.005 GΩ | X5R Class II | 3.2 | 1.6 | 1.6 | 0.6 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | ||
 | 750318131 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | WE-AGDT Auxiliary Gate Drive Transformer | – | – | – | EP7 | -40 °C up to +130 °C | – | – | – | 11.3 | 10.95 | 11.94 | – | – | 9 - 18 | 15 | -4 | 6 | 7.5 | 7 | 5 | 350 | 2.25:3.5:1 | Flyback | LT8302 | ||
| 750318114 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | WE-AGDT Auxiliary Gate Drive Transformer | – | – | – | EP7 | -40 °C up to +130 °C | – | – | – | 11.3 | 10.95 | 11.94 | – | – | 9 - 18 | 19 | – | 6 | 6.8 | 6 | 6.2 | 350 | 1:2 | Flyback | LT8302 | ||
| 750319497 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 7 files | WE-AGDT Auxiliary Gate Drive Transformer | – | – | – | EP7 | -40 °C up to +130 °C | – | – | – | 11.3 | 10.95 | 11.94 | – | – | 9 - 18 | 19 | 4 | 6 | 7.5 | 7 | 4.5 | 350 | 2.25:4.25:1 | Flyback | LT8302 | ||
| 750319496 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 7 files | WE-AGDT Auxiliary Gate Drive Transformer | – | – | – | EP7 | -40 °C up to +130 °C | – | – | – | 11.3 | 10.95 | 11.94 | – | – | 9 - 18 | 20 | 5 | 6 | 7.3 | 7 | 4.5 | 350 | 1.8:3.6:1 | Flyback | LT8302 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012207084 | SPEC | |
| 885012207103 | SPEC | |
| 885012108022 | SPEC | |
| 750318131 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 750318114 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 750319497 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 750319496 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | 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 | Samples |
|---|