поискавой системы для электроныых деталей |
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SI9961 датащи(PDF) 1 Page - Vishay Siliconix |
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SI9961 датащи(HTML) 1 Page - Vishay Siliconix |
1 / 8 page Si9961 Vishay Siliconix Document Number: 70014 S-20883—Rev. G, 24-Jun-02 www.vishay.com 1 12-V Voice Coil Motor Driver FEATURES D 1.8-A H-Bridge Output D Class B Linear Operation D Externally Programmable Gain and Bandwidth D Undervoltage Head Retract D Programmable Retract Current D Low Standby Current D Rail-to-Rail Output Swing D Single 12-V Supply D System Voltage Monitor with Fault Output 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 31/2-inch hard disk drives and optical disk drives. The driver is capable of delivering 1.8 A at a nominal supply of 12 V. The Si9961 provides all necessary functions including a motor current sense amplifier, a loop compensation amplifier and a power amplifier featuring four complementary MOSFETs in a H-bridge configuration. The output crossover protection ensures no cross-conducting current and true Class B operation during linear tracking. Externally programmable gain switch at the input summing junction increases the resolution and dynamic range for a given DAC. The head retract circuitry can be activated by either an undervoltage condition or an external command. An external resistor is required to set the VCM current during retract. The Si9961 is constructed on a self-isolated BiC/DMOS power IC process. The IC is available in 24-pin SO package for operation over the commercial, C suffix (0 to 70 _C) temperature range. FUNCTIONAL BLOCK DIAGRAM A3 A4 Q3 Q4 Q1 Q2 A5 A2 OA2 IA2– FAULT RETRACT RINH RINL VCC VDD V+ EXT VREF VREF– VR OUTPUT A ISENSE IN+ ISENSE IN– + – Retract Control – + Voltage Monitor – + – + IRET GND VR VR RFB GAIN SELECT ISENSE OUT SA SB Acceleration Error VR OUTPUT B 818 712 17 19 20 16 14 15 21 13 3 24 2 1 10 22 11 6 9 23 5 4 R 7 R R 8 R Enable |
Аналогичный номер детали - SI9961 |
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Аналогичное описание - SI9961 |
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