STMicroelectronics

The STEVAL-1PS02A evaluation board allows evaluation of a smart converter design able to deliver up to 400 mA output current from a 1.8 V to 5.5 V input, with a dynamically adjustable 1.4 V to 1.75 V output voltage. The board embeds the ST1PS02AQTR nano-quiescent miniaturized synchronous step-down converter which implements enhanced peak current control (PCC) and advanced design circuitry to minimize quiescent current. It features a controlled load switch to supply a subsystem with the same voltage rail. The device is supplied in TQFN12 (2.0x1.7 mm) thin package, but other packages are also available. The board demonstrates how highly efficient conversion can be achieved using just the ST1PS02AQTR, a 2.2 μH inductor and two small capacitors. The board highlights ST1PS02AQTR key application benefits, including high efficiency and small PCB size and thickness, and is ideal for power conversion solutions in wearable applications, fitness accessories, personal tracking monitors, smart watches, sports bands, energy harvesting, wireless sensors, industrial sensors, portable low power devices, single cell Li-Ion battery applications as well as Bluetooth®low energy and Zigbee applications.

The STEVAL-1PS02B evaluation board demonstrates a smart converter design able to deliver up to 400 mA output current from a 1.8 V to 5.5 V input, with a dynamically adjustable1.8 V to 2.5 V output voltage. The board features the ST1PS02BQTR nano-quiescent miniaturized synchronous step-down converter which implements enhanced peak current control (PCC) and advanced design circuitry to minimize quiescent current. The device embeds a controlled load switch to supply a subsystem with same voltage rail. The board demonstrates how highly efficient conversion can be achieved with just the ST1PS02BQTR, a 2.2 µH inductor and two small capacitors. The board highlights key application benefits made possible by the ST1PS02BQTR, including high efficiency and small PCB size and thickness, and is ideal for power management solutions in wearable applications and fitness accessories, personal tracking monitors, smart watches, sports bands, energy harvesting, wireless sensors, industrial sensors, portable low power devices, single cell Li-Ion battery applications, and Bluetooth®low energy and Zigbee applications. The device used on this board is supplied in the thin TQFN12 (2.0x1.7 mm) package, but other packages are also available.

The STEVAL-1PS02D evaluation board allows evaluation of a smart converter able to deliver up to 400 mA output current from a 1.8 to 5.5 V input, with a dynamically adjustable 1.0 to 1.35 V output voltage. The board embeds the ST1PS02DQTR nano-quiescent miniaturized synchronous step-down converter which implements enhanced peak current control (PCC) and advanced design circuitry to minimize quiescent current. It features a controlled load switch to supply a subsystem with the same voltage rail. The device is supplied in TQFN12 (2.0x1.7 mm) thin package, but other packages are also available. The board demonstrates how highly efficient conversion can be achieved using just the ST1PS02DQTR, a 2.2 μH inductor and two small capacitors. The board highlights the key application benefits of the ST1PS02DQTR, including high efficiency and small PCB size and thickness, and is ideal for power conversion solutions in wearable applications, fitness accessories, personal tracking monitors, smart watches, sport bands, energy harvesting, wireless sensors, industrial sensors, portable low power devices, single cell Li-Ion battery applications, as well as Bluetooth low energy and Zigbee applications.

The STEVAL-2STPD01 is an evaluation kit composed of an expansion board containing two Type-C ports and integrating two STPD01PUR programmable buck converters for USB Power Delivery, and the NUCLEO-G071RB STM32 Nucleo-64 development board. The kit exploits the characteristics of the STPD01PUR programmable buck regulator controlled through I²C interface, and the UCPD peripheral embedded in the STM32G071RBT6 microcontroller supported by a dedicated firmware stack to implement a USB Type-C and PD dual port source adapter with power sharing capability. Once the input power rate is fixed, the kit is able to balance the power on the two ports, supporting the requests sent by the USB PD devices connected to each port. Taking advantage of STPD01PUR characteristics to output several voltage levels, the solution is able to manage up to 120 W (60 W for each port) according to the DC input power. The expansion board has been specifically developed to be stacked on the NUCLEO-G071RB development board using the capability of its microcontroller to manage two UCPD peripherals at the same time. It also embeds the TCPP02-M18 USB Type-C port protection for Source applications and the L7983PU50R synchronous step-down switching regulator. To fully demonstrate the USB Type-C and Power Delivery functionalities of the solution, the STSW-2STP01 software package, containing the demo application example, has been designed for the NUCLEO-G071RB STM32 Nucleo development board. The solution is compliant with USB Type-C 2.1 and PD 3.1 specifications.

The A6983I is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to -4.5 A (even during soft-start) allows a proper energy transfer to the secondary side, as well as enables a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, makes the solution more robust. Both the compact QFN-16 (3x3 mm) package and the internal compensation of the A6983I help minimizing the design complexity and size. The switching frequency can be programmed in the 200 kHz to 1 MHz range with an optional spread spectrum for improved EMC. The EN pin provides a enable/disable functionality. The typical shutdown current is 2 μA when disabled. As soon as the EN pin is pulled-up, the device is enabled and the internal 1.3 ms soft-start takes place. The A6983I features a Power Good open collector that monitors the FB voltage. Pulse by pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal runaway.

The A6986I is an automotive grade device specifically designed for the isolated buck topology. The 100% duty cycle capability and the wide input voltage range meet the cold crank and load dump specifications for automotive systems. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability typically up to 1.9 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 300 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection in the primary side. Due to the primary reverse current limit, the secondary output is protected against short-circuit events. A primary output voltage supervisor, which notifies primary output voltage regulation through the RST open collector output, overvoltage protection, adjustable switching frequency, synchronization and a programmable soft-start are also available. For traditional buck topology in automotive application the A6986 / A6985F / A6986F / A6986H is recommended.

The STEVAL-A6986IV3 is an evaluation board based on ST A6986I. The A6986I is designed for isolated applications and normally implements an iso-buck architecture. The STEVAL-A6986IV3 board adopts an inverting buck-boost topology at the primary side (instead of a standard buck), hence building an isobuck-boost (so called from now on). The advantages in using the isobuck-boost instead of a buck are mainly: higher deliverable power at the secondary side, optimization of the transformer design. The input voltage is up to 28 V. Since the primary side performs an inverting buck-boost conversion, the primary output voltage is negative. The secondary side of the board consists of four independent windings, each one intended to provide the supply for a gate driver (see block diagram on page 2) thanks to a very accurate post regulation. The isobuck-boost architecture exploits the power capability of the A6986I, delivering up to 60 mA for three secondary channels and up to 180 mA for the fourth one. A microswitch provides the possibility to select two regulated voltage pairs for each channel: 18 V / - 5 V or 15 V / - 8 V. The regulation of these voltages is achieved by using the LDH40 (for the positive voltage) and a shunt regulator TL431B (for the negative voltage). The expanded output voltage range (up to 22 V) of the LDH40 makes it ideal for this kind of application. Thanks to the LDH40 and the TL431B, the described post regulation allows a voltage accuracy well below ±1%. The availability of four well-regulated dual voltages makes this solution ideal for gate driving in three-phase inverters.

The STEVAL-AETKT1V1 evaluation kit implements a bidirectional current sense amplifier consisting of a sense resistor placed either on the high side or the low side. The kit consists of a main board and a daughter board with TSC2011 high voltage, bidirectional, current sense amplifier providing a fixed gain of 60. The TSC2011 device implements a thin film resistor for extremely precise gain and very high common-mode rejection ratio (CMRR) performance, even in high frequency ranges. The device can work with an input common mode voltage well beyond the power supply VCCrange (2.7 V to 5.5 V), which is ideal for automotive and similar applications requiring reverse battery support without consequent damage. It also works with 48 V battery applications, as the device can support and measure the current on line at voltages up to 70 V, no additional protective components are required in that range. Moreover, the ability to fix the output common mode voltage means that the device can be either used as unidirectional or bidirectional current sensing amplifier. The main board in the kit can accommodate other daughter boards with TSC201x current sense amplifiers to allow testing and evaluation of different gain configurations.

The STEVAL-AKI001V1 evaluation board allows the user to evaluate the conversion performance of the ADC120 8-channel analog-to-digital converter designed for 50 ksps to 1 Msps conversion. The board has several on-board sources like temperature sensor and strain gauge signals, and can accept external signals to allow measurement and evaluation of the ADC120 conversion performance based on its successive approximation register (SAR) with internal track-and-hold cell. The board is supplied ready-to-use in standalone mode, or it can be plugged onto a NUCLEO-L476RG board with SMT32 microcontroller, which enables further signal processing and PC communication.

The STEVAL-AKI002V1 evaluation board allows the user to evaluate the conversion performance of the ADC1283 8-channel analog-to-digital converter designed for 50 to 200 ksps conversion. The board can accept external signals to allow measurement and evaluation of the ADC1283 conversion performance based on its successive approximation register (SAR) with the internal track-and-hold cell. A reference voltage is also present on the board and can be connected to one of the channels through a jumper. The board is supplied in ready-to-use in standalone mode, or it can be connected to a NUCLEO-L476RG board with a STM32 microcontroller, which enables further signal processing and PC communication. This product can be used with the STSW-AKI GUI.