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SI9961ACY-T1 Datasheet(PDF) 4 Page - Vishay Siliconix |
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SI9961ACY-T1 Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 9 page RINH RFB RINL IA2− ISENSE OUT OA2 FAULT 21 ISENSE (IN)− VCC IRET EXT VREF SOURCE B OUTPUT B VDD (Spindle Supply) V+ OUTPUT A RETRACT GND GAIN SELECT SOURCE A ENABLE GND VREF− ISENSE (IN)+ 24-Pin SOIC (Wide Body) 22 23 24 2 3 4 1 18 19 20 5 6 7 17 8 14 15 16 9 10 11 13 12 Top View Si9961A Vishay Siliconix www.vishay.com 4 Document Number: 70014 S-40845—Rev. H, 03-May-04 PIN CONFIGURATION AND ORDERING INFORMATION ORDERING INFORMATION Part Number Lead (Pb)-Free Part Number Temperature Range Package Si9961ACY 0 to 70_C SOIC-24 Si9961ACY-T1 Si9961ACY-T1—E3 0 to 70_C SOIC-24 (Wide Body) APPLICATIONS Introduction The Si9961A 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 Si9961A operates from a 12-V ("10%) power supply and delivers 1 A of steady-state output current. This device is made possible by a power IC process which combines bipolar, CMOS and complimentary DMOS technologies. CMOS logic and linear components minimize power consumption, bipolar front-ends on critical amplifiers provide necessary accuracy, and complimentary (p- and n-channel) DMOS devices allow the transconductance output amplifier to operate from ground to VDD. Two user-programmable, current feedback/input voltage ratios may be digitally selected to optimize gain for both seek and track following modes, to maximize system accuracy for a given DAC resolution. An undervoltage lockout circuit monitors the V+ supply and generates a fault signal to trigger an orderly head-retract sequence at a voltage level sufficient to allow the spindle motor’s back EMF-generated voltage to supply the necessary head parking energy. Head retract can also be commanded via a separate RETRACT input. VCM current during retract can be user programmed with a single external resistor. External components are limited to R/C filter components for loop compensation and the resistors that are required to program gain, retract current, and the load current sense. User-Programmable Gains During linear operation, the transconductance amplifiers’ gains (input voltage at VIN vs. VCM current, in Figure 1) are set by external resistors R3 ! R5, RSA, and RSB and selected by gain input. After selecting a value for RSA and RSB that will yield the desired VCM current level, the High and Low feedback gain ratios may be determined by the following: (GAIN SELECT Input = High) High Gain + R5 R3 1 4RS (GAIN SELECT Input = Low) Low Gain + R5 R4 1 4RS Where RS = RSA = RSB Input offset current may then be calculated as: IOS + 1 4RS RS ) RIN RIN VOSA2 ) 5VIAS3 Where RIN = R3 or R4 |
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