STMicroelectronics STEVAL-ISA032V1

Overview

STEVAL-ISA032V1 from STMicroelectronics is a 60 W forward converter demonstration board built around the L5991 primary-side PWM controller and STP10NK60Z 600 V N-channel MOSFET, delivering 9 V / 5.5 A (6 A peak) output from 88–265 Vac input. It is designed specifically to power the STEVAL-IPC001V1 electronic fiscal cash register (EFCR) board and supports thermal printer loads.

For engineers reviewing the STEVAL-ISA032V1 datasheet, STEVAL-ISA032V1 pinout, STEVAL-ISA032V1 application, or STEVAL-ISA032V1 equivalent, this board provides a validated reference design for AC/DC offline forward converters targeting fiscal equipment with EN60950 safety and EN55022 conducted EMI compliance.

Technical Context

The board implements a single-ended forward topology with primary-side regulation via the L5991 IC, which integrates oscillator, error amplifier, PWM comparator, and gate driver. Output voltage feedback is isolated using PC817 optocoupler and TL431 shunt regulator, enabling precise 9 V regulation under varying load conditions.

Power stage uses STP10NK60Z as the main switching MOSFET with 600 V V_DSS, R_DS(on) = 0.7 Ω, and TO-220 package; secondary-side rectification employs STPS30H100 Schottky diode (100 V, 30 A). Input bridge rectifier is a standard 4-pin diode bridge; transformer T1 is custom-wound (20 mH primary).

Key Specifications

Availability

STEVAL-ISA032V1 is available at Aetrix Electronics and suitable for electronic fiscal cash register (EFCR) systems, thermal printer power modules, and offline AC/DC forward converter reference designs requiring stable component supply and regulatory-compliant validation.

Supply support for STEVAL-ISA032V1 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, Switzerland, designing and manufacturing microcontrollers, power devices, analog ICs, and evaluation platforms for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate development of certified, application-specific power solutions for fiscal, point-of-sale, and embedded industrial equipment.

FAQ

What is the primary application target for STEVAL-ISA032V1?

The board is purpose-built to supply power to the STEVAL-IPC001V1 electronic fiscal cash register (EFCR) demonstration platform. Its 9 V / 5.5 A output meets the logic, display, and communication subsystem requirements of certified fiscal terminals, and its 60 W peak capability supports intermittent thermal printing loads without voltage sag.

Does STEVAL-ISA032V1 include safety isolation and EMI filtering?

Yes. It incorporates reinforced isolation via PC817 optocoupler and TL431 feedback, meets EN60950 creepage/clearance requirements, and includes EN55022 Class B-compliant filtering: X-capacitor (C8), Y-capacitors (C19), common-mode choke (L2), and RC snubber (R11/C7) across the main switch.

Can STEVAL-ISA032V1 be modified for different output voltages?

Yes-output voltage is set by the TL431 + optocoupler feedback divider (R2, R3, R9). Adjusting R2/R3 ratio changes regulation setpoint; however, transformer turns ratio and secondary rectifier ratings (STPS30H100) constrain practical range to ±15% of 9 V without hardware redesign.

Is STEVAL-ISA032V1 still in active production?

No-STMicroelectronics has marked STEVAL-ISA032V1 as obsolete (per revision history and "Obsolete Product(s)" headers in documentation). Aetrix Electronics offers remaining stock with full traceability and supports migration paths to current-generation ST evaluation boards such as STEVAL-ISA208V1 or similar forward-converter references.