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Overview
| Topology | Flyback Converter |
| Input voltage | 9-18 V |
| Switching frequency | 80-360 kHz |
| Output 1 | -4 V / 0.32 A |
| Output 2 | 15 V / 0.32 A |
| IC revision | G |
Description
This reference design presents an extremely compact auxiliary power supply with a combined output power up to 6 W. Three different isolated bipolar output voltages are provided: +15 V / -4 V, +19 V / -4 V and +20 V / -5 V. The design is optimized for driving high-voltage SiC-MOSFET and IGBT discrete devices as well as power modules in high-power converters, and can be easily integrated in the gate driver system. The extremely low interwinding capacitance of the WE-AGDT transformers down to 7 pF helps to achieve high CMTI rating (Common-Mode Transient Immunity). This enables fast switching speeds which can yield efficiency and power density gains, as increasingly required in trending applications in e-mobility,renewable energy or industrial automation.
Features
- Small size(Var.A: 27 mm x 14 mm x 14 mm) (Var.B: 40 mm x 14 mm x 13 mm)
- 4 kV primary-secondary isolation
- Only 7 pF typ. parasitic capacitance enabling high CMTI
- PSR Flyback topology with LT8302 (ADI Power by Linear)
- Load/line regulation less than 1 % typ.
- Up to 88 % peak efficiency (86 % at 6 W)
- Standard and AEC-Q qualified component assembly variants
- Two PCB Layout Variants (2-layer and 4-layer)
Typical applications
- Renewable energy: Solar inverters
- Switch-mode power supplies with SiC MOSFETs
- E-mobility: Electric Powertrain
- Industrial drives: AC motor inverter
- On-board and Off-board battery chargers
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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 470 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance470 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor3 % | Insulation Resistance1.1 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 1 µF, ±10% | 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 | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 10 µF, ±10% | 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 | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WE-AGDT Auxiliary Gate Drive Transformer, –, – | 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 | ||||
| WE-AGDT Auxiliary Gate Drive Transformer, –, – | 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 Power3 W | Interwinding Capacitance7 pF | Inductance18 µH | Saturation Current1.6 A | Switching Frequency 350 | Turns Ratio2.25:3.5:1 | VersionFlyback | IC ReferenceLM5180 |