MC33033_07 ONSEMI [ON Semiconductor], MC33033_07 Datasheet - Page 14

• Manufacturer Part Number: MC33033_07
• Description: Brushless DC Motor Controller
• Manufacturer: ONSEMI [ON Semiconductor]

Figure 25. Current Waveform Spike Suppression
The addition of the RC filter will eliminate current−limit
instability caused by the leading edge spike on the current
waveform. Resistor R
6
5
2
V
0.001
The totem pole output can furnish negative base current for
enhanced transistor turn−off, with the addition of capacitor C.
C
= 12 V
Figure 29. High Voltage Boost Supply
Figure 27. Bipolar Transistor Drive
1
8
This circuit generates V
MC1455
18 k
S
R
100 mV
100 mV
Q
4
S
should be a low inductance type.
17
16
15
12
17
16
15
12
7
3
Boost
C
C
C
C
for Figure 24.
R
1.0 μ/200 V
V
V
1N5352A
V
M
M
M
+ 8.0
+ 4.0
+ 12
R
S
Boost Current (mA)
0
−
+
*
V
* = MUR115
I
Base Charge
Removal
B
M
20
= 170 V
*
22
MC33033, NCV33033
40
http://onsemi.com
t
V
Boost
60
14
13
Figure 28. Current Sensing Power MOSFETs
Virtually lossless current sensing can be achieved with the
implementation of SENSEFET power switches.
Gnd
Series gate resistor R
by the MOSFET input capacitance and any series wiring induction in the
gate−source circuit. Diode D is required if the negative current into the
Bottom Drive Outputs exceeds 50 mA.
100 mV
Figure 30. Differential Input Speed Controller
Figure 26. MOSFET Drive Precautions
17
16
15
12
V
V
V
Pin 11
A
B
R
S
R
R
g
R
3
1
+ V
will damp any high frequency oscillations caused
4
100 mV
R
A
2
19
10
11
7
9
R 3 ) R 4
R 1 ) R 2
G
M
17
16
15
12
D
D = 1N5819
Then :
K
V Pin 9 [
If : SENSEFET = MPT10N10M
Power Ground:
To Input Source Return
S
REF
SENSEFET
EA
D
R 2
R 3
D
D
R
40 k
R
R
V
R
g
–
S
g
Pin 9
g
= 200 Ω , 1/4 W
PWM
R 4
R 3
R
S
[ 0.75 I
V
@ I pk @ R
r
DM(on) ) R S
B
pk
DS(on)