SI9961 Vishay Siliconix, SI9961 Datasheet
SI9961
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SI9961 Summary of contents
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... D Class B Linear Operation D Externally Programmable Gain and Bandwidth DESCRIPTION The Si9961 is a linear actuator (voice coil motor) driver suitable for use in disk drive head positioning systems. The Si9961 contains all of the power and control circuitry necessary to drive the VCM that is typically found in 3 drives and optical disk drives ...
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... Si9961 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltages Referenced to Common Pin V+ Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin (FAULT Pin (Output A & B, Source A & Pin (All Others Maximum Clamp Current Output A, Output B (Pulsed 10% duty cycle) Pin (All Others ...
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... Min Typ 0.2 0.8 10.2 11.6 2.0 4.5 5 10.8 12 108 135 810 0.15 0.40 4.75 5 3.82 4.12 40 9.1 9.8 100 3.5 –1 – –0.8 –0.33 0.25 400 0. – 3.74 kW RET 0 3.74 kW 3.0 –0.3 Si9961 b Max Unit 0.01 0.4 mA 1.6 13 5.5 13.2 240 W 300 1800 0.65 mA 5. 0.50 mA 1100 %/V %/_C www.vishay.com 3 ...
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... RETRACT GAIN SELECT APPLICATIONS Introduction The Si9961 Voice Coil Motor (VCM) driver integrates the active feedback and drive components of a head-positioning servo loop for high-performance hard-disk applications. The Si9961 operates from a 12-V ("10%) power supply and delivers steady-state output current. This device is made possible by a power IC process which combines bipolar, CMOS and complimentary DMOS technologies ...
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... OUT ret ret Head retract can be initiated automatically by an undervoltage condition (either the 12-V or 5-V supplies on the Si9961) by connecting the FAULT output to the RETRACT input. A high ENABLE input puts both driver outputs in a high-impedance state. The ENABLE function can be used to Document Number: 70014 S-20883— ...
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... Si9961 Vishay Siliconix Frequency Compensation: The VCM transconductance (in siemens) of this simplified case may be expressed in the s (Laplace) plane as Where R = VCM resistance in ohms VCM inductance in henrys the Laplace operator In this case, the transconductance pole is at –Rv/Lv desirable to cancel this pole in the interest of stability ...
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... Including the external resistor mismatch, the overall loop nonlinearity is approximately 1% maximum over a "250-mV input voltage range –1 requires careful –2 –3 –4 –5 –300 FIGURE 2. Si9961 Transconductance Si9961 Vishay Siliconix ) were "5% and 0.5 W ” ...
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... Si9961 Vishay Siliconix 0.016 mF 6 – Gain + – Gain 6 0.016 –5 –8 –11 –14 –17 – 100 Frequency (Hz) FIGURE 4. www.vishay.com Cross-Over – Protection + Cross-Over – ...