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NCV33035DWR2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
MC33035, NCV33035
http://onsemi.com
16
Figure 29. Current Sensing Power MOSFETs Figure 30. High Voltage Boost Supply
D
G
S
R
S
M
K
SENSEFET
Virtually lossless current sensing can be achieved with the implementation of
SENSEFET power switches.
V
Pin
9
[
R
S
@ I
pk
@ R
DS(on)
r
DM(on)
) R
S
Power Ground:
To Input Source Return
If: SENSEFET = MPT10N10M
R
S
= 200 Ω, 1/4 W
Then : V
Pin
9
≈ 0.75 I
pk
16 Gnd
Control Circuitry Ground (Pin 16) and Current Sense Inverting Input (Pin 15)
must return on separate paths to the Central Input Source Ground.
15
20
21
19
9
100 mV
This circuit generates V
Boost
for Figure 25.
1.0/200 V
V
Boost
*
22
1
*
1N5352A
MC1555
5
2
6
0.001
18 k
3
V
M
+ 12
V
CC
= 12 V
4
V
M
= 170 V
R
S
Q
* = MUR115
8
Boost Current (mA)
V
M
+ 4.0
40
7
60
20
V
M
+ 8.0
Boost Voltage (V)
0
Figure 31. Differential Input Speed Controller
Figure 32. Controlled Acceleration/Deceleration
R
4
R
2
R
1
R
3
13
V
B
V
A
REF
PWM
EA
8
7
11
12
V
Pin
13
+ V
A
ǒ
R
3
) R
4
R
1
) R
2
Ǔ
R
2
R
3
*
ǒ
R
4
R
3
V
B
Ǔ
Resistor R
1
with capacitor C sets the acceleration time constant while R
2
controls the deceleration. The values of R
1
and R
2
should be at least te
n
times greater than the speed set potentiometer to minimize time constan
t
variations with different speed settings.
R
1
EA
R
2
8
PWM
C
Enable
Increase
Speed
7
12
11
13
REF
25 μA
25 μA
MC33035, NCV33035
http://onsemi.com
17
PWM
EA
8
7
11
The SN74LS145 is an open collector BCD to One of Ten decoder. When con-
nected as shown, input codes 0000 through 1001 steps the PWM in incre-
ments of approximately 10% from 0 to 90% on−time. Input codes 1010
through 1111 will produce 100% on−time or full motor speed.
Figure 33. Digital Speed Controller Figure 34. Closed Loop Speed Control
16
V
CC
Gnd
Q
0
2
40.4 k
8
P0
BCD
Inputs
Q
9
Q
8
Q
7
Q
6
Q
5
Q
4
Q
3
Q2
Q
1
P3
P2
P1
100 k
1
51.3 k
3
4
5
6
7
63.6 k
77.6 k
92.3 k
108 k
9
126 k
11
145 k
166 k
10
5.0 V
SN74LS145
REF
15
14
13
12
25 μA
13
12
13
REF
PWM
EA
8
7
11
12
The rotor position sensors can be used as a tachometer. By differentiatin
g
the positive−going edges and then integrating them over time, a voltag
e
proportional to speed can be generated. The error amp compares this vo
lt-
age to that of the speed set to control the PWM.
0.22
1.0 M
0.1
100 k
0.01
10 k
10 k
1.0 M
To Sensor
Input (Pin 4)
25 μA
13
REF
PWM
EA
8
7
11
12
This circuit can control the speed of a cooling fan proportional to the difference
between the sensor and set temperatures. The control loop is closed as the
forced air cools the NTC thermistor. For controlled heating applications, ex-
change the positions of R
1
and R
2
.
Figure 35. Closed Loop Temperature Control
T
R
1
R
6
R
5
R
2
R
3
R
4
V
B
+
V
ref
ǒ
R
5
R
6
)1
Ǔ
R
3
§§ R
5
øR
6
V
Pi
n
3
+ V
ref
ǒ
R
3
) R
4
R
1
) R
2
Ǔ
R
2
R
3
*
ǒ
R
4
R
3
V
B
Ǔ
25 μA
MC33035, NCV33035
http://onsemi.com
18
SYSTEM APPLICATIONS
Three Phase Motor Commutation
The three phase application shown in Figure 36 is a
full−featured open loop motor controller with full wave, six
step drive. The upper power switch transistors are
Darlingtons while the lower devices are power MOSFETs.
Each of these devices contains an internal parasitic catch
diode that is used to return the stator inductive energy back
to the power supply. The outputs are capable of driving a
delta or wye connected stator, and a grounded neutral wye
if split supplies are used. At any given rotor position, only
one top and one bottom power switch (of different totem
poles) is enabled. This configuration switches both ends of
the stator winding from supply to ground which causes the
current flow to be bidirectional or full wave. A leading edge
spike is usually present on the current waveform and can
cause a current−limit instability. The spike can be eliminated
by adding an RC filter in series with the Current Sense Input.
Using a low inductance type resistor for R
S
will also aid in
spike reduction. Care must be taken in the selection of the
bottom power switch transistors so that the current during
braking does not exceed the device rating. During braking,
the peak current generated is limited only by the series
resistance of the conducting bottom switch and winding.
I
peak
+
V
M
) EMF
R
switch
) R
winding
If the motor is running at maximum speed with no load, the
generated back EMF can be as high as the supply voltage,
and at the onset of braking, the peak current may approach
twice the motor stall current. Figure 37 shows the
commutation waveforms over two electrical cycles. The
first cycle (0° to 360°) depicts motor operation at full speed
while the second cycle (360° to 720°) shows a reduced speed
with about 50% pulse width modulation. The current
waveforms reflect a constant torque load and are shown
synchronous to the commutation frequency for clarity.
Figure 36. Three Phase, Six Step, Full Wave Motor Controller
R
S
R
C
Q
5
Q
6
Q
4
V
M
S
Motor
A
Q
3
S
C
B
Q
1
Q
2
Enable
Q
S
C
T
R
R
T
Oscillator
Error Amp
PWM
Thermal
Shutdown
Reference
Regulator
Lockout
Undervoltage
V
M
Fwd/Rev
Q
R
S
Faster
Speed
Set
Rotor
Position
Decoder
60°/120°
Brake
4
8
3
17
22
7
6
5
18
13
11
12
10
24
20
2
1
21
14
9
19
15
Fault
Ind.
Gnd 16
23
25 μA
I
Limit
N
N
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

NCV33035DWR2

Mfr. #:
Buy NCV33035DWR2
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers DC Brushless Motor
Lifecycle:
New from this manufacturer.
Delivery:
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