Дискретные компоненты, силовые модули - Решения

This circuit uses a parallel-to-series topology that dynamically adjusts LED load voltage as the instantaneous bridge output voltage varies. While a switch-mode power supply such as a buck converter reconfigures the input voltage to match the load, this circuit reconfigures the load to match the input voltage. When the instantaneous input voltage is relatively low, the LEDs are configured in parallel. When the instantaneously input voltage is relatively high, the LEDs are configured in series.

The circuit is designed for input voltages between 100 VAC and 140 VAC . ON Semiconductor CCRs are used to provide constant LED current and to protect LEDs from over-voltage conditions. The circuit employs an additional CCR (shown as CCR2) to increase LED current at high voltages for improved efficiency, PF, and THD performance.

• 120 and 230 VAC Off-line Regulation
• Typical Output Current of 10 mA
• Maximum Output Current Thermally Limited
• Transient Survivability of 2.5kV
• Overtemperature Protection
• Output Voltage Range of 3V to 5V
• Three Selectable LDOs:
  • MCP1754 (3.3V)
  • MCP1755 (5.0V)
  • MCP1790 (3.0V)

The Dual Stepper Motor Driver Shield Evaluation Board evaluates the AMIS30543, a microstepping stepper motor driver for bipolar stepper motors. It has an on chip voltage regulator, reset output and watchdog reset able to supply peripheral devices. The chip is connected through IO pins and a SPI interface with an external microcontroller that is regulated through the PCA9655E's 16 bits of General Purpose parallel Input and Output (GPIO) expansion.

The AMIS-30543 is a micro-stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and an SPI interface with an external microcontroller. It has an on chip voltage regulator, reset?output and watchdog reset, able to supply peripheral devices. AMIS-30543 contains a current?translation table and takes the next micro?step depending on the clock signal on the "NXT" input pin and the status of the "DIR" (=direction) register or input pin.

The chip provides a so-called "speed and load angle" output. This allows the creation of stall detection algorithms and control loops based on load-angle to adjust torque and speed. It is using a proprietary PWM algorithm for reliable current control. The chip is fully compatible with the automotive voltage requirements. The AMIS-30543 is ideally suited for general-purpose stepper motor applications in the automotive, industrial, medical, and marine environment. With the on-chip voltage regulator it further reduces the BOM for mechatronic stepper applications.

Evaluation Board developed for 1ED44176N01F - EiceDRIVER™ 25 V low-side gate driver with integrated over-current protection (OCP) and enable/ fault output indication. The board contains one comparator, which is designed as a pulse generator, and one 1ED44176N01F to drive a SOT235-package MOSFET switch connected with an adjustable resistance load (potentiometer-R3).The MOSFET controls the turn-on or turn-off of the resistance load. Rotating the potentiometer, changes the loop current when the MOSFET is on, then gets the different voltage on the shunt resistor (R7). The two LEDs on the board show the different working status of 1ED44176N01F. If the green LED lights up, the 1ED44176N01F is working in normal operation mode. If the red LED lights up, the 1ED44176N01F is in fault condition mode.

EVAL-1ED44176N01F is available from Infineon in sampling quantities.

The STEVAL-TDR034V1 demonstration board is a 70 W hybrid RF power module for 12.5 V mobile radios that operate in the 380-470 MHz band.

This module is a 3-stage lineup power amplifier using the PD84002, the PD85006L-E and two PD85050S specially designed for broadband operation, which allows power control, high gain and high efficiency.

The board uses devices in plastic packages to ensure a high moisture sensitivity level.

For additional information, please refer to www.st.com/rf.

• N-channel enhancement-mode lateral MOSFETs (IDD в‰… 0 @VDD = 12.5 V, VGG = 0 V)
• Pout > 70 W, О·tot = 50% (typ) @VDD = 12.5 V, VGG = 5 V, Pin = 5 dBm
• Broadband frequency range: 380-470 MHz
• High moisture sensitivity level
• Low power control current IGG = 3 mA (typ) @VGG = 5 V
• ESD protection
• Development kit available to aid in production or system integration.
• RoHS compliant

В базовом проекте производится преобразование сопротивления терморезисторов (RTD) в напряжение с уровнем, удобным для использования в качестве входа АЦП. Прецизионный источник опорного тока производит возбуждение, а инструментальный усилитель масштабирует сигнал. В данном проекте также используется конфигурация с трёхпроводным RTD для минимизации ошибок, связанных с сопротивлением проводников.

Данный базовый проект имеет характер аппаратного решения.

This circuit uses active switching to change how the load is being driven. The LED load will either be driven from the capacitor, C1, discharging, or directly from the AC source. The CCR ensures a constant current through the LED throughout all modes of operation. The switching point of the circuit may be changed by varying the resistor, R1. Changing this switching point will change the amount of time the capacitor is charging. If a higher power output is desired a higher current CCR can be used and the switching point will need to be changed. A metal oxide varistor and fuse are designed into the circuit for surge protection purposes.