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    參數(shù)資料
    型號(hào): PIC16CR74-I/PT
    廠商: Microchip Technology
    文件頁數(shù): 56/172頁
    文件大?。?/td> 0K
    描述: IC PIC MCU 4KX14 44TQFP
    標(biāo)準(zhǔn)包裝: 160
    系列: PIC® 16C
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 33
    程序存儲(chǔ)器容量: 7KB(4K x 14)
    程序存儲(chǔ)器類型: ROM
    RAM 容量: 192 x 8
    電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-TQFP
    包裝: 托盤
    2007 Microchip Technology Inc.
    DS39599G-page 147
    PIC18F2220/2320/4220/4320
    FIGURE 16-7:
    EXAMPLE OF FULL-BRIDGE APPLICATION
    16.4.3.1
    Direction Change in Full-Bridge
    Mode
    In the Full-Bridge Output mode, the P1M1 bit in the
    CCP1CON register allows users to control the forward/
    reverse direction. When the application firmware
    changes this direction control bit, the module will
    assume the new direction on the next PWM cycle.
    Just before the end of the current PWM period, the mod-
    ulated outputs (P1B and P1D) are placed in their inactive
    state, while the unmodulated outputs (P1A and P1C) are
    switched to drive in the opposite direction. This occurs in
    a time interval of 4 TOSC * (Timer2 Prescale Value)
    before the next PWM period begins. The Timer2
    prescaler will be either 1, 4 or 16, depending on the
    value of the T2CKPS bit (T2CON<1:0>). During the
    interval from the switch of the unmodulated outputs to
    the beginning of the next period, the modulated outputs
    (P1B and P1D) remain inactive. This relationship is
    shown in Figure 16-8.
    Note that in the Full-Bridge Output mode, the ECCP
    module does not provide any dead band delay. In gen-
    eral, since only one output is modulated at all times,
    dead band delay is not required. However, there is a
    situation where a dead band delay might be required.
    This situation occurs when both of the following
    conditions are true:
    1.
    The direction of the PWM output changes when
    the duty cycle of the output is at or near 100%.
    2.
    The turn-off time of the power switch, including
    the power device and driver circuit, is greater
    than the turn-on time.
    Figure 16-9 shows an example where the PWM direc-
    tion changes from forward to reverse at a near 100%
    duty cycle. At time t1, the outputs P1A and P1D
    become inactive, while output P1C becomes active. In
    this example, since the turn-off time of the power
    devices is longer than the turn-on time, a shoot-through
    current may flow through power devices QC and QD
    (see Figure 16-7) for the duration of ‘t’. The same
    phenomenon will occur to power devices QA and QB
    for PWM direction change from reverse to forward.
    If changing PWM direction at high duty cycle is required
    for an application, one of the following requirements
    must be met:
    1.
    Reduce PWM for a PWM period before
    changing directions.
    2.
    Use switch drivers that can drive the switches off
    faster than they can drive them on.
    Other options to prevent shoot-through current may
    exist.
    PIC18F4220/4320
    P1A
    P1C
    FET
    Driver
    FET
    Driver
    V+
    V-
    Load
    FET
    Driver
    FET
    Driver
    P1B
    P1D
    QA
    QB
    QD
    QC
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