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ML4426IS Bi-directional Sensorless BLDC Motor Controller
型号:   ML4426IS
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描述:   Bi-directional Sensorless BLDC Motor Controller
文件大小 :   354 K    16 页
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品牌   MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
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July 2000
ML4426*
Bi-directional Sensorless BLDC Motor Controller
GENERAL DESCRIPTION
The ML4426 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 ML4426 limits the motor current using a constant off-
time PWM control loop. The velocity loop is controlled
with an onboard amplifier. The ML4426 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
Motor starts and stops with power to IC
s
Bi-directional motor drive for applications requiring forward/
reverse operation
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.
(* Indicates Part Is End Of Life As Of July 1, 2000)
BLOCK DIAGRAM
(Pin Configuration Shown for 28 Pin Version)
17
VDD
750nA
FB A
22
FB B
23
FB C
24
BACK
EMF
SAMPLER
1.5V
+
CAT
750nA
VDD
19
CRT
21
CRR
20
SPEED CVCO
FB
15
16
RVCO
1.5V
+
VDD
500nA
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
13
VCO
OUT
F/R
12
+
VCO
OUT
R
A
F
B
COMMUTATION
STATE MACHINE
HA
HB
GATING
LOGIC
&
OUTPUT
DRIVERS
UVLO
HC
LA
LB
LC
UV FAULT
4kΩ
REFERENCE
2
3
4
9
10
11
18
8
SPEED SET
5
SPEED COMP
3.9V
+
E
D
C
1.7V
6
CT
20kHz
1
ISENSE
1.7V
×
5
VREF
16kΩ
+
ILIMIT
1-SHOT
1.4V
VDD
+
8kΩ
26
CIOS
BRAKE
25
14
VDD
GND
28
27
RREF
7
VREF
1
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