PIC16F1847-I/SO Microchip Technology, PIC16F1847-I/SO Datasheet - Page 224
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PIC16F1847-I/SO
Manufacturer Part Number
PIC16F1847-I/SO
Description
14 KB Flash, 1K Bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core 18 S
Manufacturer
Microchip Technology
Datasheets
1.PIC16F1847-ISO.pdf
(408 pages)
2.PIC16F1847-ISO.pdf
(408 pages)
3.PIC16F1847-ISO.pdf
(10 pages)
Specifications of PIC16F1847-I/SO
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F1847-I/SO
Manufacturer:
MICROCHIP
Quantity:
30 000
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PIC16(L)F1847
24.4.5
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
illustration. The lower seven bits of the associated
PWMxCON register
in terms of microcontroller instruction cycles (T
T
FIGURE 24-17:
DS41453A-page 224
OSC
Standard Half-Bridge Circuit (“Push-Pull”)
).
PROGRAMMABLE DEAD-BAND
DELAY MODE
(Figure
EXAMPLE OF HALF-BRIDGE APPLICATIONS
24-4) sets the delay period
Figure 24-16
PxA
PxB
CY
or 4
Preliminary
for
FET
Driver
FET
Driver
FIGURE 24-16:
PxA
PxB
td = Dead-Band Delay
Note 1: At this time, the TMRx register is equal to the
(2)
(2)
V+
V-
(1)
2: Output signals are shown as active-high.
td
Pulse Width
PRx register.
Load
Period
td
EXAMPLE OF
HALF-BRIDGE PWM
OUTPUT
2011 Microchip Technology Inc.
+
V
-
+
V
-
(1)
Period
(1)
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