STMicroelectronics

The EVLSRK1000A-PF is a demonstration board, designed for evaluation of the SRK1000A synchronous rectification controller. The SRK1000A implements a control scheme specific for secondary-side synchronous rectification in flyback converters and provides high-current gate-drive outputs for driving N-channel power MOSFET. The device can operate both in quasi-resonant applications and in fixed frequency (FF) mixed DCM-CCM applications. The board is provided with a setting suitable for QR applications. To use in FF applications, a 100 pF capacitor needs to be added in C4. A 68 kΩ resistor (R5) is provided on the TON pin that fixes the blanking after the turn-on to about 0.8 μs. The board includes the SR MOSFET (PowerFLAT 5 x 6 package) and can be easily implemented into an existing converter to substitute rectifier diodes.

The EVLSRK1001-PF is a demonstration board, designed for evaluation of the SRK1001 synchronous rectification controller. The SRK1001 implements a control scheme specific for secondary-side synchronous rectification in flyback converters and provides high-current gate-drive outputs for driving N-channel Power MOSFET. The device can operate both in quasi-resonant (QR) applications and in fixed frequency (FF) mixed DCM-CCM applications. The board is provided with a setting suitable for QR application. To use in FF applications, a 100pF capacitor needs to be added in C3. A 120 kΩ resistor (R3) is provided on the TON pin that fixes the blanking after the turn-on to about 1.44 µs. The blanking time after turn-off is set to 3 μs through a 100 kΩ resistor (R4) on TOFF pin. In order to use the DIS/SYNC pin functionality, the user has to remove the zero ohm resistor R9: the PCB already provides a NPN transistor connected to this pin for remote ON/OFF. The board includes the SR MOSFET (PowFLAT 5 x 6 package) and can be easily implemented into an existing converter to substitute rectifier diodes.

The EVLSRK1004A, EVLSRK1004B, EVLSRK1004C, and EVLSRK1004D are demonstration boards, designed for evaluation of the SRK1004x synchronous rectification controller. The SRK1004 is a controller intended for secondary side synchronous rectification (SR) in a Non-Complementary Active Clamp Flyback converter. It provides a gate-drive output suitable for N-channel logic-level or standard level power MOSFETs. The control scheme of this IC is such that the SR MOSFET is switched on as soon as current starts flowing through its body diode and it is then switched off as current approaches zero. The boards are provided with a setting suitable for ACF or QR application in low-side mode. In this case, the devices are supplied directly from the converter’s output voltage. When operated in high-side configuration, a special function enables a quick detection of short-circuit conditions to inhibit its operation as if the IC were powered directly from the output voltage. In the case that it is used in high-side configuration, it is recommended to power the board from a dedicated auxiliary winding and to use R5 > 36 K to configure Vout,sc (for short-circuit detection with Vout > 0 V). For example R5 = 150 K to configure Vout,sc = 2 V. The boards include the SR MOSFET (PowerFLAT 5 x 6 package) and can be easily implemented into an existing converter to substitute rectifier diodes.

The EVLSTCH03-36W-SR shown in the image here is a 36 W wide-range mains USB charger demonstration board, with selectable output voltage (5 - 9 - 12 V @ 3 A output current), based on the STCH03L and SRK1000B. The power circuit is a quasi-resonant (QR) flyback converter, with peak current mode control, based on the STCH03L IC. The circuit operates with secondary side constant voltage (CV) regulation through an optocoupler and is capable of providing constant output current (CC) regulation using primary sensing feedback. The STCH03L embeds a 650 V, non-dissipative, HV startup cell, which, along with the extremely low quiescent current and burst-mode management, helps minimize residual input consumption, thus achieving less than 20 mW under no-load condition. At secondary side, the SRK1000B controller implements synchronous rectification to increase system efficiency: it controls the synchronous rectifier MOSFET, driving its gate with minimal turn-on delay and maximizing the turn-off time instant (through an adaptive mechanism) so that the residual conduction of the SR MOSFET body diode after turn-off reduces to the target value of 300 ns. The charger is designed to meet the most stringent energy saving recommendations (Eu CoC rev. 5 - Tier 2 and EPS of DOE USA) as well as EMI regulation EN55022-Class-B for line conducted noise emissions.

The EVLSTNRG011-150 is a 12 V, 150 W power supply demonstration board for 90 V ac to 264 V ac mains, which is representative of an AC/DC converter for an all in one (AIO) computer or a general purpose high power adapter. The design is based on the STNRG011 IC, a digital combo that controls a two-stage AC/DC SMPL. The front-end is a transition mode PFC pre-regulator and the second stage is an LLC HB resonant converter. The SRK2001 implements the synchronous rectification in order to obtain higher efficiency. No auxiliary supply is needed due to the very low consumption at no load. A full set of auxiliary functions and protection is also provided, this allows reduction of the overall BOM while maintaining a rugged design. The performances of the EVLSTNRG011-150 can meet the requirements of major standards ENERGY STAR® for computers ver. 6.1, EuP Lot 6Tier 2, European CoC ver. 5 Tier-2, in terms of efficiency, no-load input power and power factor and feature harmonics content well below the limits of European Standard EN61000-3-2 Class- D and Japanese standard JEITA-MITI Class-D regulations.

The EVLVIPGAN50FL evaluation board implements a 15 V-50 W SSR isolated flyback converter developed for general purpose application, operating from 90 to 265 VAC. The reference design is built around the VIPERGAN50, a new advanced offline high-voltage converter by STMicroelectronics, having the following features: - 650 V PowerGaN with embedded senseFET (Si) and HV startup; - QR operation with dynamic blanking time and adjustable valley synchronization delay functions, to maximize efficiency at any input line and load condition; - Valley-lock to ensure constant valley skipping; - Input voltage feedforward compensation for mains-independent OPP intervention; - Adaptive burst mode for advanced power management in light load conditions; - Frequency jittering for EMI suppression. Enhanced system reliability is ensured by the built-in soft-start function and by the following set of protections: - Input OVP (settable); - Brown-in and brown-out (settable); - Output OVP (settable); - Output overload; - OCP LEB; - Embedded thermal shutdown. The EVLVIPGAN50FL is composed of a main board and a daughterboard, whose schematics are shown in Figure 1 and Figure 2 respectively. The main board contains, on the primary side, a diode bridge for double wave rectification, an input pi filter for EMI, a flyback transformer, the VIPERGAN50 and all the related components needed for polarization and features setting; on the secondary side, the output capacitors and the output rectifier, realized by a Power MOSFET driven by a synchronous rectifier for efficiency optimization.

The EVLVIPGAN65PD is a 65 W USB Type-C® Power Delivery 3.0 adapter reference design. It is an isolated power supply with a standalone USB PD controller. The evaluation board implements at the primary side a quasi-resonant flyback converter based on the VIPERGAN65 HV converter with optocoupler feedback for voltage regulation. This controller combines a high performance low-voltage PWM controller chip with a 650 V HV startup cell in the same package. The advanced power management with the low quiescent helps to achieve low standby consumptions. At the secondary side, to increase the system efficiency, the rectification is based on the SRK1001 adaptive synchronous rectification controller. Also on the secondary side, the CC/CV regulation loop to drive the power regulation stage and the USB Type-C®PD interface is based on the STUSB4761 controller. This controller offers the benefits of a full hardware USB PD stack allowing robust, deterministic, and safe negotiation in line with USB PD standards. The evaluation board implements a robust adapter protected for output overvoltage, output undervoltage, output over power and output short-circuit. This reference design, based on STMicroelectronics semiconductors, helps designers to develop adapters with a short bill of materials in order to obtain a cost-effective and fast design.

The EVSPIN32F06Q1S3 board is a 3-phase complete inverter based on the STSPIN32F0601 controller, QFN 72L package version, which embeds a 3‑phase 600 V gate driver and a Cortex®‑M0 STM32 MCU. The power stage features STGD6M65DF2 IGBTs, but can be populated with any IGBT or Power MOSFET in DPAK or powerFLAT 8x8 HV package. The board has a 3-shunt sensing topology, and the field-oriented control (FOC), either sensored or sensorless, can be implemented. This makes it especially suited to drive permanent magnet synchronous motors (PMSMs). The evaluation board is compatible with a wide range input voltage from 35 VAC(50 VDC) to 280 VAC(400 VDC), and includes a power supply stage with the VIPER06XS in flyback configuration to generate +15 V and +3.3 V supply voltage required by the application. Debug and configuration of FW can be performed with standard STM32 tools through the detachable STLINK‑debugger. SWD and UART TX‑RX connectors are also available.