ML4411/ML4411A
PIN CONFIGURATION
ML4411
28-Pin SOIC (S28W)
GND
P1
P2
VCC2
P3
C
OTA
C
BRK
DIS PWR
N1
N2
N3
I
SENSE
C
OS
C
VCO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
I
CMD
I
LIMIT
BRAKE
VCC
PH3
PH2
PH1
I
RAMP
RC
+5V
ENABLE E/A
PWR FAIL
RESET
VCO/TACH OUT
TOP VIEW
PIN DESCRIPTION
PIN NAME
FUNCTION
PIN NAME
FUNCTION
1
2
3
4
5
6
7
GND
P1
P2
V
CC2
P3
C
OTA
C
BRK
Signal and Power Ground
Drives the external P-channel
transistor driving motor PH1
Drives the external P-channel
transistor driving motor PH2
12V power and power for the
braking function
Drives the external P-channel
transistor driving motor PH3
Compensation capacitor for linear
motor current amplifier loop
Capacitor which stores energy to
charge N-channel MOSFETs for
braking with power off.
A logic 0 on this pin turns off the N
and P outputs and causes the TACH
comparator output to appear on TACH
OUT
16
RESET
17
PWR FAIL
Input which holds VCO off and sets the
IC to the RESET condition
A “0” output indicates 5V or 12V is
under-voltage. This is an open
collector output with a 4.5k�½ pull-up
to +5V
18 ENABLE E/A A ”1” logic input enables the error
amplifier and closes the back-EMF
feedback loop
19 +5V
20 RC
21 I
RAMP
5V power supply input
VCO loop filter components
Current into this pin sets the initial
acceleration rate of the VCO during
start-up
Motor Terminal 1
Motor Terminal 2
Motor Terminal 3
12V power supply. Terminal which is
sensed for power fail
A ”0” activates the braking circuit
Sets the threshold for the PWM
comparator
Current Command for Linear Current
amplifier
8
DIS PWR
22 PH1
23 PH2
24 PH3
25 V
CC
26
BRAKE
27 I
LIMIT
28 I
CMD
9-11 N1, N2 N3 Drives the external N-channel
MOSFETs for PH1, PH2, PH3
12 I
SENSE
13 C
OS
14 C
VCO
Motor current sense input
Timing capacitor for fixed off-time
PWM current control
Timing capacitor for VCO
15 VCO/TACH Logic Output from VCO or TACH
OUT
comparator
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
