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ML4411CS Datasheet(PDF) 9 Page - Micro Linear Corporation

No. de pieza ML4411CS
Descripción Electrónicos  Sensorless Spindle Motor Controller
Download  14 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

ML4411CS Datasheet(HTML) 9 Page - Micro Linear Corporation

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9
ML4411/ML4411A
BRAKING
As shown in figure 9, the braking circuit pulls the N-
Channel MOSFET gates high when BRAKE falls below a
1.4V threshold. After a power failure, CDLY is discharged
slowly through RDLY providing a delay for retract to occur
before the braking circuit is activated. The N-Channel
buffer (B1) tri-states when the BRAKE pin reaches 2.1V to
ensure that no charge from CBRK is lost through the pull-
down transistor in B1. To brake the motor with external
signals, first disable power by pulling pin 8 low, then pull
pin 26 below 1.4V using an open drain (or diode isolated)
output.
The bias current for the Braking circuits comes from
VCC2. When the N-Channel MOSFETs turn on, no
additional power is generated for VCC2 (motor back-EMF
rectified through out the MOSFET body diodes). After
VCC2 drops below 4V, Q2 turns off. Continued braking
relies on the CGS of the N-Channel MOSFETs to sustain
the MOSFET gate enhancement voltage.
0
0.01
0.02
0.03
0.04
0.05
60
50
40
30
20
10
0
COS
Figure 8. ILIMIT Output Off-Time vs. COS.
P3 ONLY
+
VCC2 – 3V
COMM. LOGIC
26
8
27
28
12
RDLY
BRAKE
CDLY
1.4V
+
A4
A6
VCC2
DIS PWR
COMMUTATION
LOGIC
UVLO
ILIMIT
ICMD
ISENSE
+
A3
+
A2
A1
AV = 5
Q
ONE
SHOT
Q2
VCC
VCC2
7
P1 . . . P3
N1 . . . N3
RSENSE
VIN
13
6
COS
COTA
CBRK
B1
VCC
2.1V
+
A5
VCC2
DIS PWR
VCC2
16K
POWER FAIL
4.5K
17
+5
UVLO
Q1
1K
TRI-
ST.
Figure 9. Current Control, Output Drive and Braking Circuits.


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