参数资料
型号: ATMEGA16A-AUR
厂商: Atmel
文件页数: 4/88页
文件大小: 0K
描述: MCU AVR 16KB FLASH 16MHZ 44TQFP
产品培训模块: megaAVR Introduction
标准包装: 2,000
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 带卷 (TR)
其它名称: ATMEGA16A-AUR-ND
PIC16F610/616/16HV610/616
DS41288F-page 104
2009 Microchip Technology Inc.
10.4.6
PROGRAMMABLE DEAD-BAND
DELAY MODE
In half-bridge applications where all power switches are
modulated at the PWM frequency, the power switches
normally require more time to turn off than to turn on. If
both the upper and lower power switches are switched
at the same time (one turned on, and the other turned
off), both switches may be on for a short period of time
until one switch completely turns off. During this brief
interval, a very high current (shoot-through current) will
flow through both power switches, shorting the bridge
supply. To avoid this potentially destructive shoot-
through current from flowing during switching, turning
on either of the power switches is normally delayed to
allow the other switch to completely turn off.
In Half-Bridge mode, a digitally programmable dead-
band delay is available to avoid shoot-through current
from destroying the bridge power switches. The delay
occurs at the signal transition from the non-active state
to the active state. See Figure 10-16 for illustration.
The lower seven bits of the associated PWM1CON
register (Register 10-3) sets the delay period in terms
of microcontroller instruction cycles (TCY or 4 TOSC).
FIGURE 10-16:
EXAMPLE OF HALF-
BRIDGE PWM OUTPUT
FIGURE 10-17:
EXAMPLE OF HALF-BRIDGE APPLICATIONS
Period
Pulse Width
td
(1)
P1A(2)
P1B(2)
td = Dead-Band Delay
Period
(1)
Note 1:
At this time, the TMR2 register is equal to the
PR2 register.
2:
Output signals are shown as active-high.
P1A
P1B
FET
Driver
FET
Driver
V+
V-
Load
+
V
-
+
V
-
Standard Half-Bridge Circuit (“Push-Pull”)
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