Транзисторы - 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.

• Два преобразователя питания с выходом 1,2 В / 10 А и один преобразователь с выходом 1,2 В / 6 А
• Понижающий преобразователь на переключаемых конденсаторах, многофазный понижающий преобразователь и одиночный понижающий POL-преобразователь
• Высокий КПД при малой нагрузке у всех решений
• Решения с высотой менее 2 мм
• Интегрированные на печатную плату тестовые устройства для управляемых имитаций скачкообразных изменений нагрузки

• Полноценный 2-фазный DC/DC-преобразователь с высоким выходным током со всеми преимуществами технологии чередования фаз с использованием всего лишь двух однофазных компонентов
• Управление в режиме напряжения с постоянной частотой позволяет пользователю задавать частоту переключения и организовывать синхронизацию с внешним тактовым сигналом
• С целью обеспечения малогабаритности решения дроссели устанавливаются над контроллерами
• Насыщенный тестовый интерфейс, включающий в себя автономную высокоскоростную динамическую тестовую нагрузку и управляемую генератором сигналов динамическую тестовую нагрузку
• Схема электрическая принципиальная, перечень элементов, трассировка печатной платы, а также отчёт о результате испытаний, в котором акцент сделан на КПД и уровне пульсаций при использовании двух различных дросселей
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PMP20660 представляет собой базовый проект синхронного понижающе-повышающего преобразователя с использованием 4 ключей и ИС контроллера LM5175. Данный преобразователь поддерживает входное напряжение с диапазоном от 5 В до 13 В и генерирует выходное напряжение 12 В и выходной ток около 11 А в режиме постоянного напряжения / постоянного тока. Данный базовый проект собран на отладочной печатной плате LM5175EVM-HP, которая представляет собой 6-слойную печатную плату с материалом FR-4 и удельной массой меди 2 унции / кв. фут на всех шести её слоях.

Базовый проект имеет характер аппаратного решения.

This document describes the 1 kW three-phase motor control demonstration board featuring the L6390 high and low-side drivers and the STGP10NC60KD IGBT. The demonstration board is an AC/DC inverter that generates a three-phase waveform for driving three or two-phase motors such as induction motors or PMSM motors up to 1000 W with or without sensors.

The main device presented in this user manual is a universal, fully evaluated, and populated design consisting of a three-phase inverter bridge based on the 600 V STMicroelectronics™ IGBT STGP10NC60KD in a TO-220 package mounted on a heatsink, and the L6390 high- voltage high-side and low-side driver featuring an integrated comparator for hardware protection features such as overcurrent and overtemperature. The driver also integrates an operational amplifier suitable for advanced current sensing. Thanks to this advanced characteristic, the system has been specifically designed to achieve an accurate and fast conditioning of the current feedback, therefore matching the typical requirements in field oriented control (FOC).

The board has been designed to be compatible with single-phase mains, supplying from 90 VAC to 285 VAC or from 125 VDC to 400 VDC for DC voltage. With reconfiguration of the input sourcing, the board is suitable also for low-voltage DC applications up to 35 VDC. This document is associated with the release of the STEVAL-IHM023V2 demonstration board.

This application note is a Ringing Choke Converter (RCC)-based, step-by-step cell phone battery charger design procedure.

The RCC is essential to the self-oscillating fly-back converter, and operates within the Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM) boundaries without noticeable reverse recovery of the output rectifying diodes. RCC control is achieved by using discrete components to control the peak current mode, so the overall RCC cost is relatively low compared to the conventional Pulse Width Modulation (PWM) IC fly-back converter. As a result, RCC is widely used for low power applications in industry and home appliances as a simple and cost-effective solution.

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.