STMicroelectronics ISOSD61 | Demoboard STDES-AKI003V1 / TN1376

Description

An overview of the ISOSD61 performance using the STDES-AKI003V1 reference design is herein described.The STDES-AKI003V1 provides accurate current sensing for high-end industrial motor control applications based on threephase inverter topology. It is tailored for high-end servo drives.The board features three ISOSD61 16-bit isolated sigma-delta modulators (with low voltage differential signaling (LVDS) andsingle-ended (TTL/CMOS) options) and six power metal strip shunt resistors (two in parallel for each phase) of 5 mΩ 7 W forcurrent sensing placed inline with the motor phases.Two types of tests have been performed: a low-current test running a motor in closed loop to verify the quality of the currentmeasurement and a nominal current test.The tests have been carried out using:• an STEVAL-CTM009V1 5 kW low voltage high current inverter for industrial motor control applications composed of:– a power stage– a capacitor board– a driver board– and a current sensing board which has not been used for the tests as it has been replaced by the STDES-AKI003V1• an STM32H7B3I-EVAL evaluation board with STM32H7B3LI MCU• an STDES-AKI003V1 sigma-delta current sensing board• DC power supplies: 24 V,48 V (VBUS), 12 V (Aux), 5 V (STDES-AKI003V1 power supply)The STSW-AKI003, a customized version of X-CUBE-MCSDK motor control software development kit, has been used toperform the tests. In particular, the current sensing related functions have been customized to acquire the measurements ofthe motor phase currents from the sigma-delta modulated inputs using the STM32H7B3LI microcontroller sigma-delta filteringperipheral.The STDES-AKI003V1 three-phase sigma-delta current sensing board is a fully assembled board developed for performanceevaluation only, not available for sale.

Features

• 72 A motor phase peak current
• 6 kV galvanic isolation
• Up to 25 MHz sigma-delta clock
• 5 V Vin supply voltage

Typical applications

• The STDES-AKI003V1 provides accurate current sensing for high-end industrial motor control applications based on threephase inverter topology.

More information

• Datasheet
• IC product information