12V
A
0.1µF
V
CC
26
V
REF
0.1µF
R
REF
7
8V REF
8
1
200kΩ
SINE
A
UNDER VOLTAGE
LOCKOUT
FREQ.
SPEED
CONTROLLER
PWM SINE
CONTROLLER
OUTPUT
DRIVE & SHOOT
THROUGH
PROTECTION
24
21
22
19
23
20
CURRENT
LIMIT
17
GND
C
GM1
0.001µF
27
28
C
GM2
0.001µF
11
SINE
B
15
F/R
14
18
25
5V/12V
SELECT
9
R
DT
166kΩ
330pF
250mΩ
3
L
IN
4
5
8
7
HA
LA
HB
LB
HC
LC
2
I
SENSE
1kΩ
R
LIMIT
PWR
INT100
12,13,14
1
H
IN
15
11
+
B
DRIVE
+12V
2
3
100kΩ
V
SPEED
5
0.47µF
C
0
12
SINE
A
10
C
PWM
13
99kΩ
PWM
GENERATOR
220pF
C
Figure 3. 3-Phase Motor Controller with INT-100 High Voltage Drivers
B
99kΩ
1kΩ
500Ω
49.5kΩ
ML4423
SENSE
A
SENSE
C
SENSE
B
0.15µF
0.15µF
1kΩ
0.30µF
+12V
A
DRIVE
0.1µF
R
SPEED
160kΩ
6
AMPLITUDE
+12V
+V
MOTOR
170–400V
V
MIN
100kΩ
4
SINE
B
10Ω
C
1µF 100Ω
16
COAST 3PH/2PH
10Ω
100Ω
Note:
Use Extreme caution with high voltage AC motor control and drive circuitry.
When the motor is spinning at the desired speed, and the speed is rapidly reduced,
the energy stored in the rotation will generate a voltage greater than the +V
MOTOR
node,
and destruction of the power transistors, high side driver, ML4423
controller and the power supply may occur.
HV POWER STAGE
ML4423
7
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
