STMicroelectronics EVLG599-250WLLC Demonstration Board
STMicroelectronics EVLG599-250WLLC Demonstration Board is a resonant LLC converter for industrial applications, providing compact size and high efficiency. It can be used as a DC-DC converter or as part of a more complex system that utilizes a front-end preconditioner, such as a Power Factor Correction (PFC). The board is based on the STNRG599A, a resonant tank controller that implements the novel phase-shift control method, and on MASTERGAN1L, which embeds a GaN transistor-based half-bridge leg and corresponding drivers in the same package. This feature allows direct interfacing with any SMPS controller.
To achieve high efficiency, secondary-side synchronous rectification is implemented with SRK2001A. The board has no heat sinks on the primary side and offers significantly reduced dimensions. The power density is about 41W/inch3. Its high efficiency and small size make the board suitable when space is limited.
The converter's output power can reach up to 250W at 24VDC. The converter protects against overcurrent, short-circuit, and overvoltage. The STMicroelectronics STNRG599A integrated HV startup enables powering the IC from AC mains for proper power-up, eliminating the need for auxiliary standby supplies. It can also provide current to another control IC, such as the PFC control IC. The DC input voltage monitoring enables startup with the correct sequencing of cascaded converters, preventing operation with an input voltage that is too low.
The board consists of a motherboard with the LLC resonant tank and the primary controller, and two daughterboards: one on the primary side with MASTERGAN1L, and another on the secondary side with SRK2001A and the synchronous rectification MOSFETs. Note that the STNRG599A is the IC version with X-capacitor discharge enabled at the HV pin, making it suitable for adapter applications. In contrast, the STNRG599B is the IC version with X-capacitor discharge disabled at the HV pin, making it ideal for lighting applications.
Features
- High-efficiency and compact solution for DC-DC conversion using STNRG599A, MASTERGAN1L, and SRK2001A
- 24V output voltage
- Up to 250W output power
- 400V ±10% nominal input voltage
- >92% efficiency
- Output is protected against short-circuit and overcurrent
- Input voltage monitoring for correct sequencing as a DC-DC converter and brown-out protection
- Integrated high-voltage startup for converter power-up
- 78mm x 54mm (WxH) board size
- Maximum component height of 23mm
- WEEE and RoHS-compliant
Applications
- Industrial DC-DC applications
- Adapters
- Consumer Switch Mode Power Supplies (SMPS)
Block Diagram
Related Products
STMicroelectronics STNRG599 Resonant Half-Bridge Controller
Double-ended controller for series-resonant topologies, supporting both LLC and LCC configurations.
STMicroelectronics SRK2001A Controller
Features a control scheme for secondary side synchronous rectification in LLC resonant converters.
STMicroelectronics MASTERGAN GaN Half-Bridge High Voltage Drivers
Integration of a gate driver and 2x enhancement-mode GaN transistors in a half-bridge configuration.
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