PIC16F631-I/P Microchip Technology Inc., PIC16F631-I/P Datasheet - Page 145
PIC16F631-I/P
Manufacturer Part Number
PIC16F631-I/P
Description
MCU, 8-Bit, 1KW Flash, 64 RAM, 18 I/O, PDIP-20
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F631-IP.pdf
(294 pages)
Specifications of PIC16F631-I/P
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
128 Bytes
Input Output
18
Memory Type
Flash
Number Of Bits
8
Package Type
20-pin PDIP
Programmable Memory
1.75K Bytes
Ram Size
64 Bytes
Speed
20 MHz
Timers
1-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F631-I/P
Manufacturer:
MICROCHIP
Quantity:
4 500
Part Number:
PIC16F631-I/P
Manufacturer:
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Quantity:
20 000
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11.4.6
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 11-8 for illustration.
The lower seven bits of the associated PWM1CON
register (Register 11-3) sets the delay period in terms
of microcontroller instruction cycles (T
FIGURE 11-17:
© 2007 Microchip Technology Inc.
Standard Half-Bridge Circuit (“Push-Pull”)
PROGRAMMABLE DEAD-BAND
DELAY MODE
EXAMPLE OF HALF-BRIDGE APPLICATIONS
PIC16F631/677/685/687/689/690
CY
or 4 T
P1A
P1B
OSC
).
FET
Driver
FET
Driver
FIGURE 11-16:
P1A
P1B
td = Dead-Band Delay
Note 1: At this time, the TMR2 register is equal to the
(2)
(2)
V+
V-
2: Output signals are shown as active-high.
(1)
td
Pulse Width
PR2 register.
Load
Period
td
EXAMPLE OF
HALF-BRIDGE PWM
OUTPUT
+
V
-
+
V
-
(1)
DS41262D-page 143
Period
(1)
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