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[原创] Microchip MCP19215双路电源PWM控制方案

关键词:电源管理 PWM LED照明 MCP19215

时间:2017-04-26 10:42:27       作者:Microchip       来源:中电网

microchip公司的MCP19214/5是两路高度集成数字增强PWM控制器,包括全可编程微控制器核和10位模数转换器;每路PWM包括两个误差放大器,以及可调基准电压发生器,电流传感输入,可编斜率补偿发生器,可编振荡器,电流传感差分放大器和MOSFET驱动器.AEC Q100认可和PPAP功能,输入电压4.5V-42V,主要用在电池充电器,双向转换器,LED照明系统和其它低边开关PWM应用.本文介绍了MCP19215主要特性,功能框图和双LED串应用电路图,双向转换器应用电路图和MCP19215双升压/SEPIC评估板ADM00799主要特性,电路图和材料清单.

The MCP19214/5 devices are highly integrated,digitally enhanced PWM controllers, used for batterychargers, bidirectional converters, LED lightingsystems and other low-side switch PWM applications.

These devices feature two independent analog PWMcontrollers, and the internal architecture is optimizedfor applications that require precise control of theoutput parameters. Like the other members of thedigitally enhanced PWM controllers family,MCP19214/5 includes a fully programmablemicrocontroller core and a 10-bit analog-to-digitalconverter.

Each PWM channel includes two error amplifiers withindependent adjustable reference voltage generators,current sense input with programmable leading edgeblanking, programmable slope compensation rampgenerator, integrated internal programmable oscillator,current sense differential amplifier and an integratedMOSFET driver.

An internal LDO (+5V) is used to power the PIC core,the analog circuitry and to provide 5V externally. This5V external output can also be used to supply theinternal MOSFET drivers. The internal MOSFETdrivers have the option to be powered from an external voltage source (up to 10V) in order to accommodateapplications that require higher voltages for gatedriving.

The MCP19214/5 controllers offer a very high degreeof integration, allowing the user to develop complexapplications without additional circuitry. Some uniquefeatures, like simultaneous control of the converter’soutput current and voltage, make MCP19214/5 devices ideally suited for battery chargers, LED driversand bidirectional converters. Additionally, the GeneralPurpose Inputs/Outputs (GPIOs) can be used to drivevarious switches, to enable/disable additional circuitry,or to indicate a typical state.

The MCP19214 is packaged in a 28-lead5 mm x 5 mm QFN, and the MCP19215 in a 32-lead5 mm x 5 mm QFN. The operating input voltage fornormal device operation is 4.5V-42V, with an absolutemaximum of 44V. The maximum transient voltage is48V for 500 mS.

Power trains supported by this architecture include, butare not limited to, Boost, Buck-Boost, Flyback, SEPICand Cuk.MCP19214/5 integrates an I2C controller and an Addressable Universal Synchronous AsynchronousReceiver Transmitter (AUSART) module (only forMCP19215). The user can develop specificcommunication protocols using the internal interfaces.

A PMBus compatible protocol, specific for powerconverters, can be implemented using the providedI2C serial bus.

Complete customization of the device operatingparameters, start-up or shutdown profiles, protectionlevels and fault handling procedures are accomplishedby firmware that can be developed using Microchip’sMPLAB® X Integrated Development Environment.

Programming the MCP19214/5 is done using one ofMicrochip’s many in-circuit debugger and deviceprogrammers.

MCP19215主要特性:

• AEC Q100 Qualified and PPAP Capable
• Input Voltage Range: 4.5V-42V
• Two Independent High-Performance PWMControllers
• Two Independent Control Loops per Channelallowing the User to Simultaneously Control theOutput Voltage and Current
• Can Be Configured to Control Multiple Topologiesincluding but Not Limited To:
- Boost
- Flyback
- Ćuk
- Single-Ended Primary-Inductor Converter(SEPIC)
• Peak Current Mode Control
• Master/Slave Operation of the PWM Controllerswith Adjustable Phase Shift
• Differential Output Current Sense Capability
• Integrated Low-Side Current Sense DifferentialAmplifier (10X)
• Integrated Low-Side Gate Drivers:
- 0.5A Sink/Source Current Capability at 5VSupply Voltage
- 1A Sink/Source Current Capability at 10VSupply Voltage
• Special Events Generator (the state of regulatingloops can be monitored without firmwareoverhead)
• Configurable Parameters:
- Reference Voltages for Regulating Loops(four internal DACs)
- Input Undervoltage Lockout (UVLO)
- Input Overvoltage Lockout (OVLO)
- Primary Current Leading Edge Blanking:0 ns, 50 ns, 100 ns and 200 ns
- Fixed Switching frequency Range:31.25 kHz-2.0 MHz
- Slope Compensation
- Primary Current Sense Offset Adjustment
- Configurable GPIO Pin Options
• Low Quiescent Current: 10 mA Typical
• Low Sleep Current: 120 μA Typical
• Thermal Shutdown
Microcontroller Features
• Precision 8 MHz Internal Oscillator Block:
- Factory-Calibrated to ±1%, Typical
• Interrupt-Capable
- Firmware
- Interrupt-on-Change Pins
• Only 35 Instructions to Learn
• 8192 Words On-Chip Program Memory
• 336 bytes of Internal RAM
• High-Endurance Flash:
- 100,000 Write Flash Endurance
- Flash Retention: > 40 Years
• Watchdog Timer (WDT) with IndependentOscillator for Reliable Operation
• Programmable Code Protection
• In-Circuit Serial Programming™ (ICSP™) via TwoPins
• Up to 12 I/O Pins and One Input-Only Pin
• Analog-to-Digital Converter (ADC):
- 10-Bit Resolution
- Internal 4096 mV Precision ReferenceGenerator
- Up to 8 External Channels
• Timer0: 8-Bit Timer/Counter with 8-Bit Prescaler
• Enhanced Timer1:
- 16-bit Timer with Prescaler
- Two Selectable Clock Sources
• Timer2: 8-Bit Timer with Prescaler
- 8-Bit Period Register
• I2C Communication:
- 7-bit Address Masking
- Two Dedicated Address Registers
• Addressable Universal Synchronous
Asynchronous Receiver Transmitter (AUSART)(only MCP19215):
- 8 and 9-Bit Data Operations
- Address Detect
- Asynchronous and Synchronous OperatingModes

图1.MCP19214/5简化内部框图

图2.MCP19214双LED串应用电路图

图3.MCP19214双向转换器应用电路图

图4.微控制器核框图
MCP19215双升压/SEPIC评估板ADM00799
The MCP19215 Dual Channel Controller Evaluation Board demonstrates how the MCP19215 device operates in Boost and SEPIC topologies over a wide input voltage and load range. Nearly all operational and control system parameters are programmable by utilizing the integrated PIC controller.

图5.MCP19215评估板ADM00799外形图
MCP19215评估板ADM00799主要特性:
• input voltage range: 8V to 15V
• output voltage: default 20V for both channels (can be software adjusted from input voltage + 1V to 24V for channel 1 and 9V to 24V for channel 2)
• default output current: 0.2A (can be software adjusted from 0A to 1A)
• 300 kHz switching frequency
• status report (including errors, input voltage, output voltage and current) via I2C communication
• under voltage lockout (UVLO) and overvoltage lockout (OVLO) with programmable thresholds (via software)

图6.MCP19215评估板ADM00799电路图
MCP19215评估板ADM00799材料清单:


详情请见:
http://ww1.microchip.com/downloads/en/DeviceDoc/20005681A.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/03-10611-R1.1.PDF
以及http://ww1.microchip.com/downloads/en/DeviceDoc/02-10611-R1.1_BOM_Web.pdf
02-10611-R1.1_BOM_Web.pf
03-10611-R1.1.PDF
20005681A.pdf

 

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