ML4411A Motor Controller Datasheet

ML4411A Datasheet, PDF, Equivalent


Part Number

ML4411A

Description

Sensorless Spindle Motor Controller

Manufacture

Micro Linear

Total Page 14 Pages
Datasheet
Download ML4411A Datasheet


ML4411A
May 1997
ML4411*/ML4411A**
Sensorless Spindle Motor Controller
GENERAL DESCRIPTION
The ML4411 provides complete commutation for delta or
wye wound Brushless DC (BLDC) motors without the need
for signals from Hall Effect Sensors. This IC senses the
back EMF of the three motor windings (no neutral
required) to determine the proper commutation phase
angle using Phase Lock Loop techniques. This technique
will commutate virtually any 3-phase BLDC motor and is
insensitive to PWM noise and motor snubbing. The
ML4411 is architecturally similar to the ML4410 but with
improved braking and brown-out recovery circuitry.
Included in the ML4411 is the circuitry necessary for a
Hard Disk Drive microcontroller driven control loop.
The ML4411 controls motor current with either a constant
off-time PWM or linear current control driven by the
microcontroller. Braking and Power Fail are also included
in the ML4411.
The timing of the start-up sequencing is determined by the
micro, allowing the system to be optimized for a wide
range of motors and inertial loads.
The ML4411 modulates the gates of external N-Channel
power MOSFETs to regulate the motor current. The IC
drives P-Channel MOSFETs directly.
The ML4411A includes a comparator on the P3 output to
prevent cross-conduction.
FEATURES
s Back-EMF commutation provides maximum torque
for minimum “spin-up” time for spindle motors
s Accurate, jitter-free phase locked motor speed
feedback output
s Linear or PWM motor current control
s Easy microcontroller interface for optimized start-up
sequencing and speed control
s Power fail detect circuit with delayed braking
s Drives external N-channel FETs and P-channel FETs
s Back-EMF comparator detects motor rotation after
power fail for fast re-lock after brownout
* This Product Is Obsolete
** This Product Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
RC
20
14 CVCO
VCO
BACK-EMF
SAMPLER
PH1 22
PH2 23
PH3
24
15 VCO/TACH OUT
16 RESET
21 IRAMP
18 ENABLE E/A
26 BRAKE
DIS PWR
8
LOGIC
AND
CONTROL
6
GATE
DRIVE
28 ICMD
27 ILIMIT
PWR FAIL
17
19 +5
25 VCC
LINEAR OR PWM
CURRENT CONTROL
POWER
FAIL
DETECT
VCC2 4
P1-3
3
N1-3
3
CBRK 7
ISENSE 12
COS 13
COTA 6
GND 1
POWER
DRIVERS
BLDC
MOTOR
PATENTED
1

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


Features May 1997 ML4411*/ML4411A** Sensorless Spindle Motor Controller GENERAL DESCR IPTION The ML4411 provides complete com mutation for delta or wye wound Brushle ss DC (BLDC) motors without the need fo r signals from Hall Effect Sensors. Thi s IC senses the back EMF of the three m otor windings (no neutral required) to determine the proper commutation phase angle using Phase Lock Loop techniques. This technique will commutate virtuall y any 3-phase BLDC motor and is insensi tive to PWM noise and motor snubbing. T he ML4411 is architecturally similar to the ML4410 but with improved braking a nd brown-out recovery circuitry. Includ ed in the ML4411 is the circuitry neces sary for a Hard Disk Drive microcontrol ler driven control loop. The ML4411 con trols motor current with either a const ant off-time PWM or linear current cont rol driven by the microcontroller. Brak ing and Power Fail are also included in the ML4411. The timing of the start-up sequencing is determined by the micro, allowing the system to .
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