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| 型号： | MCV18E-I/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP18 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, DIP-18 |
| 文件页数： | 69/108页 |
| 文件大小： | 1509K |
| 代理商： | MCV18E-I/P |
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2009 Microchip Technology Inc.
DS41399A-page 63
MCV18E
8.3.10
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 8-8 for illustration. The
lower seven bits of the associated PWM1CON register
(Register 8-3) sets the delay period in terms of
microcontroller instruction cycles (TCY or 4 TOSC).
FIGURE 8-8:
EXAMPLE OF HALF-
BRIDGE PWM OUTPUT
FIGURE 8-9:
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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