STMicroelectronics STEVAL-ISB001V1

Overview

STEVAL-ISB001V1 from STMicroelectronics is a ringing choke converter (RCC)-based demonstration board for cell phone battery charging, implementing a self-oscillating flyback topology operating in DCM/CCM boundary mode with 4.7 V output voltage, 1.9 W output power, and universal AC input range (85–265 V_AC). It integrates the STD1LNK60Z-1 primary-side controller, TL431 shunt regulator, and STTH108 fast recovery diode for low-cost, low-power offline charging.

For engineers reviewing the STEVAL-ISB001V1 datasheet, STEVAL-ISB001V1 schematic, STEVAL-ISB001V1 application, or STEVAL-ISB001V1 equivalent, this board serves as a validated reference for cost-sensitive, <5 W AC-DC battery charger designs requiring minimal BOM count, no PWM IC, and inherent reverse-recovery-free rectification behavior.

Technical Context

The STEVAL-ISB001V1 implements a discrete-component-based RCC control architecture that regulates output voltage via peak current mode sensing without a dedicated PWM IC. It relies on transformer auxiliary winding feedback to TL431 and optocoupler (PC817) for secondary-side regulation.

Operation occurs at variable frequency across line and load, constrained by DCM/CCM boundary conditions to minimize diode reverse recovery losses. The STD1LNK60Z-1 integrates a 600 V vertical superjunction MOSFET and startup circuitry, enabling direct high-voltage startup from rectified AC.

Key Specifications

Availability

STEVAL-ISB001V1 is available at Aetrix Electronics and suitable for cell phone battery charger reference design, low-power AC-DC adapter validation, and RCC topology evaluation requiring stable component supply and documented schematics.

Supply support for STEVAL-ISB001V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power devices, analog ICs, and silicon solutions for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to demonstrate application-specific power conversion topologies using ST's discrete and integrated power components for rapid prototyping and design-in support.

FAQ

What is the primary purpose of the STEVAL-ISB001V1 board?

The STEVAL-ISB001V1 is a fully assembled, tested demonstration board for a 4.7 V / 1.9 W ringing choke converter (RCC) cell phone battery charger. It validates ST's discrete RCC approach using the STD1LNK60Z-1 MOSFET, TL431, and STTH108 diode-enabling engineers to evaluate performance, thermal behavior, and EMI characteristics before custom design.

Does STEVAL-ISB001V1 include a built-in USB interface or communication port?

No. The STEVAL-ISB001V1 is a standalone analog AC-DC charger reference design with no digital interface, USB connectivity, or firmware. It features only AC input terminals, DC output terminals, and test points for voltage/current measurement-intended for functional validation, not host-controlled operation.

Can STEVAL-ISB001V1 be modified for higher output current?

Not directly. Its 1.9 W rating is fixed by transformer turns ratio, output capacitor (C8 = 330 µF/16 V), and STTH108 diode rating. Increasing current would require redesigning the transformer, output rectifier, filter capacitance, and feedback divider-voiding the validated RCC timing and stability margins documented in Doc ID 18140.

Is STEVAL-ISB001V1 RoHS compliant and suitable for commercial production?

Yes. The board is explicitly stated as RoHS compliant in its data brief and uses only lead-free components and finishes. However, it is an evaluation tool-not a certified end-product. For production use, full safety certification (IEC 60950/62368), EMI testing, and thermal validation must be performed on the final system incorporating this reference design.