QA151C3
3W isolated DC/DC for IGBT gate drivers with 3000V isolation, dual output +15V/-8V, 15pF capacitance.
Product Overview
Description
The QA151C3 is a 3W isolated DC/DC converter specifically designed for IGBT gate driver applications. It features 3000VDC isolation, dual outputs (+15V/-8V) suitable for IGBT gate drive, and low isolation capacitance of 15pF typical. This converter provides reliable isolation for motor drives, inverters, and power conversion systems.
Product Series
QA Series
Primary Application
IGBT gate driver power supply
Key Features
- 3000VDC isolation voltage
- Dual output +15V/-8V for IGBT gate drive
- Low isolation capacitance 15pF
- High CMTI 15kV/us
- Wide operating temperature -40°C to +105°C
- Compact SMD16 package
- Continuous barrier withstand voltage
- UL/EN 62368-1 certified
Specifications
| Input Voltage | 4.5-5.5VDC (5V nominal) |
|---|---|
| Output Power | 3W |
| Output Voltage | +15V/-8V (dual output) |
| Output Current | +100mA/-100mA |
| Isolation Voltage | 3000VDC |
| Isolation Capacitance | 15pF typical |
| CMTI | 15kV/us minimum |
| Operating Temperature | -40°C to +105°C |
| Package | SMD16 |
| Dimensions | 19.9 x 16.9 x 7.1mm |
| Efficiency | Up to 82% |
| Switching Frequency | 350kHz |
| Load Regulation | ±1% |
| Line Regulation | ±0.5% |
| Safety Standards | UL 62368-1, EN 62368-1 |
| MTBF | >1,000,000 hours |
Applications
IGBT gate driver power supply
Motor drive and control systems
Motor drive inverters
Motor drive and control systems
Industrial power supplies
Industrial automation and control
Welding equipment
Electronic system design
UPS systems
Electronic system design
Renewable energy inverters
Renewable energy systems
FAE Expert Insights
"Based on extensive field experience, this product delivers excellent performance across various operating conditions. The design incorporates proven architecture with robust protection features. Customers consistently report high satisfaction with reliability and ease of integration."
— Field Application Engineer, BeiLuo
Frequently Asked Questions
Why does the QA151C3 have +15V/-8V output instead of ±15V?
The +15V/-8V output is optimized for IGBT gate drive requirements. IGBTs need +15V for reliable conduction and low saturation voltage. For turn-off, negative voltage (-5V to -10V) improves turn-off speed and dv/dt immunity. Zero voltage is insufficient for fast turn-off and noise immunity in high-power applications. While ±15V provides +15V/-15V which works, it is overkill for turn-off. -8V is sufficient for most IGBT applications while reducing supply complexity and cost.
+15V/-8V is optimized for IGBT gate drive. Use this configuration for best performance in IGBT applications.
How do I calculate the required power for gate driver supply?
Gate driver power calculation: Gate charge power P = Qg × Vgate × fsw, where Qg is total gate charge from IGBT datasheet, Vgate is gate voltage swing (23V for +15V/-8V), and fsw is switching frequency. Add driver IC quiescent power. Example: IGBT with Qg=200nC at 10kHz: Gate power = 200nC × 23V × 10kHz = 46mW. Driver IC: 20mA × 23V = 460mW. Total per channel = 506mW. For 6 IGBTs: 3.04W. Select 3W supply with margin.
Calculate based on gate charge, switching frequency, and driver quiescent current. Add 30% margin for reliable operation.
What is the difference between QA151C3 and QA-R4G0315T?
QA151C3 is designed for IGBT applications with 3000V isolation, 15kV/us CMTI, and +15V/-8V output. QA-R4G0315T is designed for SiC MOSFETs with 6000V reinforced isolation, 100kV/us CMTI, +15V/-4V output, and 10pF capacitance. QA-R series has higher isolation, much higher CMTI for SiC switching, lower capacitance, and is optimized for SiC threshold voltages. Use QA151C3 for standard IGBT drives. Use QA-R4G0315T for SiC applications or when highest reliability is required.
Use QA151C3 for IGBT drives. Use QA-R4G0315T for SiC drives and high-voltage applications.
Can I use this supply for high-side and low-side gate drivers?
Yes, QA151C3 can be used for both high-side and low-side gate drivers. Each gate driver requires its own isolated supply. For a half-bridge configuration, you need two QA151C3 supplies - one for high-side and one for low-side. The isolation voltage must exceed the DC bus voltage with safety margin. 3000V isolation is sufficient for most 380V/480V AC systems (approximately 600V DC bus).
Use one supply per gate driver. Ensure isolation voltage exceeds DC bus voltage. Use QA-R series for higher voltage systems.
What input capacitor is recommended?
Use 10µF ceramic capacitor close to the input pins. Low ESR is important for stable operation. Voltage rating should be at least 10V for 5V input. Additional 0.1µF ceramic capacitor in parallel can help with high-frequency noise. Keep traces short to minimize inductance.
Use 10µF + 0.1µF ceramic capacitors close to input pins. Contact us for specific application recommendations.