Cypress PowerPSoC MR16 LED照明设计方案

2011年07月11日 13:05 发布者：1770309616

Cypress 公司的PowerPSoC集成了可编程的系统级芯片技术,业界最好的功率电子控制器和开关器件,很方便创建照明应用的功率系统级解决方案.器件内部有四个32V低边N-沟功率FET,开关频率可配置高达2MHz,1.0A时RDS(ON)为0.5欧姆,四个滞后控制器,四个低边栅极驱动器,四个精密的高边电流检测放大器,三个16位LED调光调制器rISM, DMM, 和PWM,六个快速响应(100ns)电压比较器,六个8位参考DAC,以及处理速度高达24MHz的M8C CPU核,主要用于各种LED照明.本文介绍PowerPSoC系列主要特性,PowerPSoC架构方框图,CY8CLED04D0x逻辑方框图,以及PowerPSoC解决方案框图,带DMX-512接口的MR16 LED灯参考设计电路图和材料清单.

The PowerPSoC family incorporates programmable system-on-chip technology with the best in class power electronics controllers and switching devices to create easy to use power-system-on-chip solutions for lighting applications.

All PowerPSoC family devices are designed to replace traditional MCUs, system ICs, and the numerous discrete components that surround them. PowerPSoC devices feature high performance power electronics including 1 ampere 2 MHz power FETs, hysteretic controllers, current sense amplifiers, and PrISM/PWM modulators to create a complete power electronics solution for LED power management. Configurable power, analog, digital, and interconnect circuitry enables a high level of integration in a host of industrial, commercial, and consumer LED lighting applications.

This architecture integrates programmable analog and digital blocks to enable you to create customized peripheral configurations that match the requirements of each individual application. Additionally, the device includes a 24 MHz CPU, Flash program memory, SRAM data memory, and configurable I/O in a range of convenient pinouts and packages.

The PowerPSoC architecture, as illustrated in the block diagrams, comprises five main areas: PSoC core, digital system, analog system, system resources, and power peripherals, which include power FETs, hysteretic controllers, current sense amplifiers, and PrISM/PWM modulators. Configurable global busing combines all the device resources into a complete custom system. The PowerPSoC family of devices have 10-port I/Os that connect to the global digital and analog interconnects, providing access to eight digital blocks and six analog blocks.

PowerPSoC 主要特性：

■ Integrated power peripherals

❐ Four internal 32 V low side N-Channel power FETs

• RDS(ON)– 0.5 ohm for 1.0 A devices

• Up to 2 MHz configurable switching frequency

❐ Four hysteretic controllers

• Independently programmable upper and lower thresholds

• Programmable minimum ON/OFF timers

❐ Four low side gate drivers with programmable drive strength

❐ Four precision high side current sense amplifiers

❐ Three 16-bit LED dimming modulators: PrISM, DMM, and PWM

❐ Six fast response (100 ns) voltage comparators

❐ Six 8-bit reference DACs

❐ Built-in switching regulator eliminates external 5 V supply

❐ Multiple topologies including floating load buck, floating load buck-boost, and boost

■ M8C CPU core

❐ Processor speeds up to 24 MHz

■ Advanced peripherals (PSoC® Blocks)

❐ Capacitive sensing application capability

❐ DMX512 interface

❐ I2C master or slave

❐ Full-duplex UARTs

❐ Multiple SPI masters or slaves

❐ Integrated temperature sensor

❐ Up to 12-bit ADCs

❐ 6 to 12-bit incremental ADCs

❐ Up to 9-bit DACs

❐ Programmable gain amplifiers

❐ Programmable filters and comparators

❐ 8 to 32-bit timers and counters

❐ Complex peripherals by combining blocks

❐ Configurable to all GPIO pins

■ Programmable pin configurations

❐ 25 mA sink, 10 mA source on all GPIO and function pins

❐ Pullup, pull down, high Z, strong, or open drain drive modes on all GPIO and function pins

❐ Up to 10 analog inputs on GPIO

❐ Two 30 mA analog outputs on GPIO

❐ Configurable interrupt on all GPIO

■ Flexible on-chip memory

❐ 16 K Flash program storage 50,000 erase and write cycles

❐ 1 K SRAM data storage

❐ In-System Serial Programming (ISSP)

❐ Partial Flash updates

❐ Flexible protection modes

❐ EEPROM emulation in Flash

■ Complete development tools

❐ Free development software: PSoC Designer™

❐ Full featured, In-Circuit Emulator and Programmer

❐ Full speed emulation

❐ Complex breakpoint structure

❐ 128 kBytes trace memory

■ Applications

❐ Stage LED lighting

❐ Architectural LED lighting

❐ General purpose LED lighting

❐ Automotive and emergency vehicle LED lighting

❐ Landscape LED lighting

❐ Display LED lighting

❐ Effects LED lighting

❐ Signage LED lighting

■ Device options

❐ CY8CLED04D0x

• Four internal FETs with 0.5 A and 1.0 A options

• Four external gate drivers

❐ CY8CLED04G01

• Four external gate drivers

❐ CY8CLED03D0x

• Three internal FETs with 0.5 A and 1.0 A options

• Three external gate drivers

❐ CY8CLED03G01

• Three external gate drivers

❐ CY8CLED02D01

• Two 1.0 A internal FETs

• Two external gate drivers

❐ CY8CLED01D01

• One 1.0 A internal FET

• One external gate driver

56-pin QFN package

图1。PowerPSoC架构方框图

图2。CY8CLED04D0x逻辑方框图

图3。RGBA彩色混合驱动外接MOSFET的LED照明框图

带DMX-512接口的MR16灯参考设计

This document demonstrates the use of PowerPSoC to design small form factor fixtures such as MR-16 lamps with DMX-512 interface. It outlines the architecture of the fixture and the LED driver board reference design, followed by its bring up and operation procedure. Code examples to implement color mixing for multicolor lamps and tunable white light systems are also provided.

Cypress has developed a compact LED driver solution for use in an MR16 fixture. The controller board uses the PowerPSoC device for lighting control and DMX-512 communication

Light output of LEDs is controlled by the current flowing through them. By controlling the current in the four channels, you can achieve a desired color at the desired intensity. Alternatively, the LEDs are driven with a constant current. You can modulate the time during which the current is driven to achieve a desired color. This function of the solution is implemented by PowerPSoC.

This solution incorporates DMX control, which enables you to network several fixtures, and at the same time, maintain individual control for each fixture. It provides the flexibility to connect a maximum of 85 fixtures in a network through the DMX512 communication protocol, when 6 slots are used per fixture. The fixture has four colors of LEDs: Red, Green, Blue, and Amber (RGBA). If three slots of control per fixture are used, which is similar to the tunable white light firmware variant, you can connect up to 170 fixtures.

The document describes a standard MR16 lamp with integrated LED driver. It gives an overview of the PowerPSoC family of controllers, specifications of the device used in this solution and a brief introduction to the DMX-512 communication protocol.

The hardware, firmware details of the solution are explained in later sections

The MR16 fixture is a lighting industry standard format that has a small form factor. The fixture discussed in this application note has a RGBA LED emitter board (that forms the primary light source) and a heat sink connected to a cooler device. The fixture requires the heat sink to remove the heat generated by LEDs. The cooler on the MR16 fixture is a forced air type of cooler and removes heat from the heat sink by blowing ‘micro’ jets of air. A driver board mounted on the cooler powers it.