Motor Controller. ML4425 Datasheet


ML4425 Controller. Datasheet pdf. Equivalent


Part Number

ML4425

Description

Sensorless BLDC Motor Controller

Manufacture

Micro Linear

Total Page 16 Pages
Datasheet
Download ML4425 Datasheet


ML4425
July 2000
ML4425
Sensorless BLDC Motor Controller
GENERAL DESCRIPTION
The ML4425 PWM motor controller provides all of the
functions necessary for starting and controlling the speed
of delta or wye wound Brushless DC (BLDC) motors
without Hall Effect sensors. Back EMF voltage is sensed
from the motor windings to determine the proper
commutation phase sequence using a PLL. This patented
sensing technique will commutate a wide range of 3-
Phase BLDC motors and is insensitive to PWM noise and
motor snubbing circuitry.
The ML4425 limits the motor current using a constant off-
time PWM control loop. The velocity loop is controlled
with an onboard amplifier. The ML4425 has circuitry to
ensure that there is no shoot-through in directly driven
external power MOSFETs.
The timing of the start-up sequence is determined by the
selection of three timing capacitors. This allows
optimization for a wide range of motors and loads.
FEATURES
s Stand-alone operation
s Motor starts and stops with power to IC
s On-board start sequence: Align ® Ramp ® Set Speed
s Patented Back-EMF commutation technique provides
jitterless torque for minimum “spin-up” time
s Onboard speed control loop
s PLL used for commutation provides noise immunity
from PWM spikes, compared to noise sensitive zero
crossing technique
s PWM control for maximum efficiency
s Direct FET drive for 12V motors; drives high voltage
motors with IC buffers from IR, IXYS, Harris, Power
Integrations, Siliconix, etc.
BLOCK DIAGRAM (Pin Configuration Shown for 28 Pin Version)
FB A
22
FB B
23
FB C
24
17
VDD CAT
750nA
1.5V
+
BACK
EMF
SAMPLER
19
VDD
CRT
750nA
1.5V
+
21
CRR
20 15
SPEED CVCO
FB
16
RVCO
VDD
500nA
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
13
VCO
OUT
8
SPEED SET
+
3.9V
5
SPEED COMP
CT
6
1.7V
ISENSE
1
ILIMIT
12
20kHz
1.7V
VCO
OUT
+
×5
VREF
16k
+
R
A
FB
EC
D
ILIMIT
1-SHOT
8k
CIOS
26
COMMUTATION
STATE MACHINE
1.4V
VDD
+
4k
UVLO
GATING
LOGIC
&
OUTPUT
DRIVERS
HA
2
HB
3
HC
4
LA
9
LB
10
LC
11
UV FAULT
18
REFERENCE
BRAKE
25
VDD
GND
RREF
VREF
14
28 27
7
1

ML4425
ML4425
PIN CONFIGURATION
ML4425
28-Pin Narrow PDIP (P28N)
28-Pin SOIC (S28)
ISENSE 1
HA 2
HB 3
HC 4
SPEED COMP 5
CT 6
VREF 7
SPEED SET 8
LA 9
LB 10
LC 11
ILIMIT 12
VCO/TACH 13
VDD 14
28 GND
27 RREF
26 CIOS
25 BRAKE
24 FB C
23 FB B
22 FB A
21 CRR
20 SPEED FB
19 CRT
18 UV FAULT
17 CAT
16 RVCO
15 CVCO
TOP VIEW
ML4425
32-Pin TQFP (H32-7)
H3
NC
SPEED COMP
CT
VREF
SPEED SET
LA
LB
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
FB C
FB B
FB A
CRR
SPEED FB
CRT
UV FAULT
CAT
TOP VIEW
2


Features July 2000 ML4425 Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML44 25 PWM motor controller provides all of the functions necessary for starting a nd controlling the speed of delta or wy e wound Brushless DC (BLDC) motors with out Hall Effect sensors. Back EMF volta ge is sensed from the motor windings to determine the proper commutation phase sequence using a PLL. This patented se nsing technique will commutate a wide r ange of 3Phase BLDC motors and is insen sitive to PWM noise and motor snubbing circuitry. The ML4425 limits the motor current using a constant offtime PWM co ntrol loop. The velocity loop is contro lled with an onboard amplifier. The ML4 425 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs. The timing of t he start-up sequence is determined by t he selection of three timing capacitors . This allows optimization for a wide r ange of motors and loads. FEATURES s s s s Stand-alone operation Motor starts and stops with power t.
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