ML4411 Ver la hoja de datos (PDF) - Micro Linear Corporation
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Fabricante
ML4411 Datasheet PDF : 14 Pages
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ML4411/ML4411A
APPLICATIONS
Figure 10 shows a typical application of the ML4411 in a
hard disk drive spindle control. Although the timing
necessary to start the motor in most applications would be
generated by a microcontroller, Fig. 11 shows a simple
“one shot” start-up timing approach.
Speed control can be accomplished either by:
1. Sensing the VCO OUT frequency with a
Microcontroller and adjusting ICMD via an analog
output form the Micro (PWM DAC).
2. Using analog circuitry for speed control. (Fig. 12).
OUTPUT STAGE HINTS
In the circuit in Figure 10, Q1, Q2, and Q3 are IRFR9024
or equivalent. Q4, Q5, and Q6 are IRFR024 or equivalent.
New MOSFET packaging technology such as the Little
Foot series may decrease the PC board space. These
packages, however have much lower thermal inertia and
dissipation capabilities than the larger packages, and care
should be taken not to exceed their rated current and
junction temperature.
Since the output section in a full bridge application
consists of three half-H switches, cross-conduction can
occur. Cross-conduction is the condition where an N-FET
and P-FET in the same phase of the bridge conduct
simultaneously. This could happen under two conditions
(see figure 13):
+12V
10
1N5819
0.1
TO VCC
1K
Q1
VCC2
10
1K
Q2
0.1
1K
Q3
510
Q4
Q5
510 Q6
510
100pF
0.01
0.22
0.02
+12
0.01
1 GND
2 P1
3 P2
4 VCC2
5 P3
6 COTA
7 CBRK
8 DIS PWR
9 N1
10 N2
11 N3
12 ISENSE
13 COS
14 CVCO
0.5
5K
5K
+5
ICMD
ILIMIT
BRAKE
VCC
PH3
PH2
PH1
IRAMP
RC
+5V
ENABLE E/A
PWR FAIL
RESET
VCO/TACH OUT
28
ICOMMAND
27
26
0.22
25 +12
24
23
22
1M
21
+5
20
19 +5
18
510K
17
16
15
ENABLE ERROR AMP
RESET (FROM MICRO)
POWER FAIL TO MICRO
VCO OUT
DISABLE POWER
Figure 10. ML4411 Typical Application
10
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