STMicroelectronics STWBC2-HP | Demoboard STDES-50W2CWBC

Description

The STDES-50W2CWBC is a reference design that implements a Qi-compliant inductive wireless charger transmitter.It supports two coils, which could work alternatively to increase the Rx positioning freedom.The solution supports Qi EPP-compliant mode up to 15 W, featuring an ST proprietary protocol. It can also support 50 W or an even higher wireless power transfer.The STDES-50W2CWBC is based on the STWBC2-HP high-integration, high performance wireless charger system-on-chip.It integrates: three pairs of half-bridge gate drivers, the dedicated DC-DC controllers that support buck, boost and buck-boost topologies, the high-performance Q-factor measurement hardware, the high-resolution main PWM controller, the dedicated Qi communication modulator and demodulator, the USB-PD controller, the buck DC-DC,and the charge pump.It is suitable for one-coil and multicoil solutions in multiple topologies.The STDES-50W2CWBC is a fully assembled reference design developed for performance evaluation only, not available for sale.

Features

• Qi v1.2.4-compliant wireless charging transmitter reference design following MPA2topology
• Supports Qi EPP-compliant mode up to 15 W
• Supports up to 50 W with ST proprietary protocol (STSC)
• Supports two coils working alternatively for positioning freedom
• Supports USB-PD wall adapter input
• Boost DC-DC:
• Key products: STWBC2-HP wireless charging transmitter SoC, STL20N6F7 LV MOSFET
• Input: 4.1 to 24 V DC (from USB adapter)
• Maximum input current: 3 A
• Output: up to 38 V
• Boost DC-DC controlled by STWBC2-HP SoC to convert USB adapter input to the DC bridge voltage of the wireless charger LC tank
• Short DC-DC by P-MOS on the control of STWBC2-HP SoC for the best efficiency
• Main bridge:
• Key products: STWBC2-HP wireless charging transmitter SoC, STL20N6F7LV MOSFET, STG719 analog switch
• Qi-compliant PID power control with frequency, duty-cycle, and voltage
• Switching frequency: 110 to 145 kHz
• ASK demodulation with voltage, current, and phase
• FSK modulation
• Protections for overvoltage, overcurrent, over temperature, and under voltage
• Q-factor estimation
• Auxiliaries:
• Key product: STWBC2-HP wireless charging transmitter SoC
• USB interface, embedded USB-PD stack
• Embedded buck DC-DC to convert 5 to 27 V input to 3.3 and 5 V supply voltages
• Embedded charge pump to double the voltage and support the embeddedgate drivers
• Reserved I²C interface to upgrade to Qi v1.3 with an external secure MCU

Typical applications

• Wireless Chargers

More information

• Datasheet
• IC product information