基于dsPIC33FJ設(shè)計的PSFB磚形DC-DC轉(zhuǎn)換器技術(shù)

本文介紹了dsPIC33FJ系列主要特性，方框圖和CPU 核方框圖，DSP 引擎方框圖，數(shù)字PFC框圖以及多種應(yīng)用框圖。此外還介紹了相移全橋（PSFB） 1/4磚形DC-DC轉(zhuǎn)換器參考設(shè)計主要特性和指標(biāo)，詳細(xì)電路圖與材料清單（BOM）。

Microchip 公司的dsPIC33FJ06GS101/X02和dsPIC33FJ16GSX02/X04包括有廣泛的DSP功能和高性能16位MCU架構(gòu)。3.0-3.6V的性能達(dá)到40MIPS，具有16位寬的數(shù)據(jù)通路，24位寬指令，廣泛應(yīng)用在AC/DC轉(zhuǎn)換器，汽車HID，電池充電器，DC/DC轉(zhuǎn)換器，數(shù)字照明，電磁爐，可再生能源/純正弦波逆變器和UPS。

dsPIC33FJ系列主要特性：

Operating Range:

? Up to 40 MIPS Operation (at 3.0-3.6V):

- Industrial temperature range (-40℃ to +85℃)

- Extended temperature range (-40℃ to +125℃)

High-Performance DSC CPU:

? Modified Harvard Architecture

? C Compiler Optimized Instruction Set

? 16-Bit Wide Data Path

? 24-Bit Wide Instructions

? Linear Program Memory Addressing up to 4M Instruction Words

? Linear Data Memory Addressing up to 64 Kbytes

? 83 Base Instructions: Mostly 1 Word/1 Cycle

? Two 40-Bit Accumulators with Rounding and Saturation Options

? Flexible and Powerful Addressing modes:

- Indirect

- Modulo

- Bit-Reversed

? Software Stack

? 16 x 16 Fractional/Integer Multiply Operations

? 32/16 and 16/16 Divide Operations

? Single-Cycle Multiply and Accumulate:

- Accumulator write back for DSP operations

- Dual data fetch

? Up to ±16-Bit Shifts for up to 40-Bit Data

Digital I/

? Peripheral Pin Select Functionality

? Up to 35 Programmable Digital I/O Pins

? Wake-up/Interrupt-on-Change for up to 30 Pins

? Output Pins can Drive Voltage from 3.0V to 3.6V

? Up to 5V Output with Open-Drain Configuration

? 5V Tolerant Digital Input Pins (except RB5)

? 16 mA Source/Sink on All PWM pins

On-Chip Flash and SRAM:

? Flash Program Memory (up to 16 Kbytes)

? Data SRAM (up to 2 Kbytes)

? Boot and General Security for Program Flash

Peripheral Features:

? Timer/Counters, up to Three 16-Bit Timers:

- Can pair up to make one 32-bit timer

? Input Capture (up to two channels):

- Capture on up, down or both edges

- 16-bit capture input functions

- 4-deep FIFO on each capture

? Output Compare (up to two channels):

- Single or Dual 16-Bit Compare mode

- 16-Bit Glitchless PWM mode

? 4-Wire SPI:

- Framing supports I/O interface to simple codecs

- 1-deep FIFO Buffer.

- Supports 8-bit and 16-bit data

- Supports all serial clock formats and sampling modes

? I2C?:

- Supports Full Multi-Master Slave mode

- 7-bit and 10-bit addressing

- Bus collision detection and arbitration

- Integrated signal conditioning

- Slave address masking

? UART:

- Interrupt on address bit detect

- Interrupt on UART error

- Wake-up on Start bit from Sleep mode

- 4-character TX and RX FIFO buffers

- LIN bus support

- IrDA? encoding and decoding in hardware

- High-Speed Baud mode

- Hardware Flow Control with CTS and RTS

Interrupt Controller:

? 5-Cycle Latency

? Up to 35 Available Interrupt Sources

? Up to Three External Interrupts

? Seven Programmable Priority Levels

? Four Processor Exceptions

High-Speed PWM Module Features:

? Up to Four PWM Generators with Four to Eight Outputs

? Individual Time Base and Duty Cycle for each of the Eight PWM Outputs

? Dead Time for Rising and Falling Edges

? Duty Cycle Resolution of 1.04 ns

? Dead-Time Resolution of 1.04 ns

? Phase Shift Resolution of 1.04 ns

? Frequency Resolution of 1.04 ns

? PWM modes Supported:

- Standard Edge-Aligned

- True Independent Output

- Complementary

- Center-Aligned

- Push-Pull

- Multi-Phase

- Variable Phase

- Fixed Off-Time

- Current Reset

- Current-Limit

? Independent Fault/Current-Limit Inputs for 8 PWM Outputs

? Output Override Control

? Special Event Trigger

? PWM Capture Feature

? Prescaler for Input Clock

? Dual Trigger from PWM to ADC

? PWMxL, PWMxH Output Pin Swapping

? PWM4H, PWM4L Pins Remappable

? On-the-Fly PWM Frequency, Duty Cycle and Phase Shift Changes

? Disabling of Individual PWM Generators

? Leading-Edge Blanking (LEB) Functionality

High-Speed Analog Comparator

? Up to Four Analog Comparators:

- 20 ns response time

- 10-bit DAC for each analog comparator

- DACOUT pin to provide DAC output

- Programmable output polarity

- Selectable input source

- ADC sample and convert capability

? PWM Module Interface:

- PWM duty cycle control

- PWM period control

- PWM Fault detect

High-Speed 10-Bit ADC

? 10-Bit Resolution

? Up to 12 Input Channels Grouped into Six Conversion Pairs

? Two Internal Reference Monitoring Inputs Grouped into a Pair

? Successive Approximation Register (SAR)

Converters for Parallel Conversions of Analog Pairs:

- 4 Msps for devices with two SARs

- 2 Msps for devices with one SAR

? Dedicated Result Buffer for each Analog Channel

? Independent Trigger Source Section for each Analog Input Conversion Pair

Power Management:

? On-Chip 2.5V Voltage Regulator

? Switch between Clock Sources in Real Time

? Idle, Sleep, and Doze modes with Fast Wake-up

CMOS Flash Technology:

? Low-Power, High-Speed Flash Technology

? Fully Static Design

? 3.3V (±10%) Operating Voltage

? Industrial and Extended Temperature

? Low-Power Consumption

System Management:

? Flexible Clock Options:

- External, crystal, resonator, internal RC

- Phase-Locked Loop (PLL) with 120 MHz VCO

- Primary Crystal Oscillator (OSC) in the range of 3 MHz to 40 MHz

- Internal Low-Power RC (LPRC) oscillator at a frequency of 32 kHz

- Internal Fast RC (FRC) oscillator at a frequency of 7.37 MHz

? Power-on Reset (POR)

? Brown-out Reset (BOR)

? Power-up Timer (PWRT)

? Oscillator Start-up Timer (OST)

? Watchdog Timer with its RC Oscillator

? Fail-Safe Clock Monitor (FSCM)

? Reset by Multiple Sources

? In-Circuit Serial Programming? (ICSP?)

? Reference Oscillator Output

dsPIC33FJ 系列應(yīng)用：

? AC-to-DC Converters

? Automotive HID

? Battery Chargers

? DC-to-DC Converters

? Digital Lighting

? Induction Cooking

? LED Ballast

? Renewable Power/Pure Sine Wave Inverters

? Uninterruptible Power Supply (UPS)


圖1。dsPIC33FJ06GS101/X02和dsPIC33FJ16GSX02/X04 方框圖

圖2。dsPIC33FJ06GS101/X02和dsPIC33FJ16GSX02/X04 CPU 核方框圖

圖3。DSP 引擎方框圖

圖4。dsPIC33FJ 數(shù)字PFC框圖

圖5。dsPIC33FJ 升壓轉(zhuǎn)換器框圖

圖6。dsPIC33FJ 單相同步降壓轉(zhuǎn)換器框圖

圖7。dsPIC33FJ 多相同步降壓轉(zhuǎn)換器框圖

圖8。dsPIC33FJ 離線UPS框圖

圖9。dsPIC33FJ 交叉PFC框圖

圖10。dsPIC33FJ 相移全橋（PSFB）轉(zhuǎn)換器框圖

圖11。帶PFC三輸出(12V, 5V和3.3V)AC/DC電源框圖

1/4磚形DC/DC轉(zhuǎn)換器參考設(shè)計

Quarter Brick DC/DC Converter Reference Design

This reference design provides an easy method to evaluate the power, and features of SMPS dsPIC? Digital Signal Controllers in high density quarter brick DC-DC converters for intermediate bus architectures(IBA). This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching t