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ML4425CH Datasheet(PDF) 1 Page - Micro Linear Corporation

No. de pieza ML4425CH
Descripción Electrónicos  Sensorless BLDC Motor Controller
Download  16 Pages
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Fabricante Electrónico  MICRO-LINEAR [Micro Linear Corporation]
Página de inicio  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4425CH Datasheet(HTML) 1 Page - Micro Linear Corporation

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background image
CAT
17
FB A
22
FB B
23
FB C
24
BACK
EMF
SAMPLER
CRT
19
+
+
1.5V
750nA
+
1.5V
750nA
VDD
VDD
CRR
21
500nA
VDD
SPEED
FB
20
CVCO
15
16
RVCO
VOLTAGE
CONTROLLED
OSCILLATOR
VCO/TACH
13
2
4
3
9
10
HA
HB
HC
LA
LB
GATING
LOGIC
&
OUTPUT
DRIVERS
+
SPEED SET
8
5
SPEED COMP
3.9V
1.7V
20kHz
6
CT
+
1.4V
1
ISENSE
× 5
UVLO
12
ILIMIT
+
1.7V
VREF
26
CIOS
16k
8k
ILIMIT
1-SHOT
25
BRAKE
VDD
4k
14
VDD
28
GND
27
RREF
11
LC
REFERENCE
VCO
OUT
VCO
OUT
18
UV FAULT
7
VREF
A
B
C
D
E
F
R
COMMUTATION
STATE MACHINE
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)
1


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