Current Sensing - Detail - Motorola M68HC08 Manual
Low power bldc drive for fans using the mc68hc908qy4 reference design
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- Reference manual (168 pages) ,
- Designer reference manual (44 pages) ,
- Designer reference manual (44 pages)
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power ground
track of the
R13
power stage
0R010 - SBL4
GND
R14
0R010 - SBL4
5.2.7 Power Supply
DRM046 — Rev 0
MOTOROLA
Freescale Semiconductor, Inc.
gain -10. The optional filter (C36/R43) at the output of the operational
amplifier, helps to filter undesirable noise. If not used, 0 ohms resistor
R43 will be inserted.
Where there is over-current, all six gate driver outputs are disabled, and
a fault is generated. Since the generated fault signal is an open collector
output, the internal pull-up of MC68HC908QY4 is utilized.
R21
82k - 1%
0.5V @
(Imax=10A)
CA-
VC0
R22
8k2 - 1%
GND
Figure 5-7. Current Sensing - Detail
On-board power supply provides auxiliary +5Vdc and +12Vdc. The
topology is shown in
Figure 8-3. Power
range from +36Vdc to +56Vdc) is decreased to +12V by a switched
mode DC-DC converter LT1676. It accepts input voltage up to +60Vdc.
The +12Vdc is used for supplying the 3-phase gate driver and optionally
for supplying of the Hall position sensor. The +12Vdc power supply is
rated to 400mA.
The +12Vdc is further decreased by linear regulator MC78M05 giving
+5Vdc. The +5Vdc is used for supplying the microcontroller, user
Hardware Design
For More Information On This Product,
Go to: www.freescale.com
Optional filter
R23
0R
C37
GND
+0.5V
Amplifier
Supply. The input voltage (in
Hardware Design
Detailed Design Description
Fault
/FAULT
Comparator
IR2132
Designer Reference Manual
43
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