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ML4435IP Datasheet(PDF) 10 Page - Micro Linear Corporation

Part # ML4435IP
Description  Sensorless BLDC Motor Controller
PDF  14 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4435IP Datasheet(HTML) 10 Page - Micro Linear Corporation

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PRELIMINARY DATASHEET
May, 2000
10
PRELIMINARY
ML4435
COAST
When CVCO (pin 20) is pulled below 1.5V the output
drivers LA, LB, LC and
HA, HB, and HC are turned off.
The COAST function shuts all power off from the motor
allowing it to coast to a stop. The COAST function in (pin
20) is configured as shown in Figure 13 and can be driven
by a switch to ground or open collector to ground also
shown in Figure 13.
Figure 14a. ML4435 Typical Application
UNDER VOLTAGE PROTECTION
Undervoltage protection is used to protect the 3 phase
bridge power stage from a low VCC condition. Undervolt-
age is triggered at VCC of 9.2V or under. Undervoltage
also turns off all output drivers LA, LB, LC,
HA, HB, and
HC. The comparator that triggers undervoltage protection
has 500mV of hystersis.
INTERFACING THE OUTPUT DRIVERS TO THE 3
PHASE BRIDGE POWER STAGE
The most flexible configuration is to use high side drivers
to control N-Channel MOSFETs (or IGBTs) allowing appli-
cations from less than 12V up to 170V. Figure 14a shows
the ML4435 and all the support circuitry in a typical
application. Figure 14b shows a power stage using the
IR2118 high side drivers from International Rectifier and
high voltage MOSFETs.
FUNCTIONAL DESCRIPTION
2
3
4
5
6
9
0
2
3
4
5
6
9
0
2
3
4
5
6
9
20
2
22
23
24
25
26
20
9
6
5
4
3
2
C2
2V
0.
F
C
4F
C5
0.33 F
C4
0F
C
.033 F
C
.F
R5
0k
R6
TP 2
S FB
200k
C9
.0
F
C0
TP 5 LIMIT
RUN
N.C.
SW
SW4PDT
COAST
N.C.
N.C.
IDC 26
P
N.C.
N.C.
N.C.
2V
N.C.
N.C.
N.C.
00 F
R 0
k
R 2
k
R9
k
R
k
R
90.9k
R
k
TP
SPEED SET
TP 3 TACH
TP 0 ISENSE
R2
00k
R6
0k
R4
20k
C3
2200 F
R3
k
ML4435
ISENSE
TACH
S COMP
RVCO
S SET
RT
HA
HB
HC
VCC
CVCO
I LIMIT
S FB
ND
FB C
FB B
FB A
LC
LB
LA
.5V
3. 5V
2V
+
–
COMP
CVCO
COAST
20
Figure 13. Coast Control



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