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ML4411CS Datasheet(PDF) 10 Page - Micro Linear Corporation |
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ML4411CS Datasheet(HTML) 10 Page - Micro Linear Corporation |
10 / 14 page 10 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): ICMD ILIMIT BRAKE VCC PH3 PH2 PH1 IRAMP RC +5V ENABLE E/A PWR FAIL RESET VCO/TACH OUT GND P1 P2 VCC2 P3 COTA CBRK DIS PWR N1 N2 N3 ISENSE COS CVCO ICOMMAND +5 1M +12 +5 510K 0.22 +5 5K 5K 0.5 Q6 Q3 0.1 10 Q2 Q5 Q1 Q4 VCC2 1N5819 0.1 10 +12V TO VCC 510 0.01 0.22 0.02 0.01 ENABLE ERROR AMP RESET (FROM MICRO) POWER FAIL TO MICRO VCO OUT DISABLE POWER 100pF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 +12 510 510 1K 1K 1K Figure 10. ML4411 Typical Application |
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