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Si9961

Features: · 1.8-A H-Bridge Output· Class B Linear Operation· Externally Programmable Gain and Bandwidth· Undervoltage Head Retract· Programmable Retract Current· Low Standby Current· Rail-to-Rail Output Swing· Single 12-V Supply· System Voltage Monitor with Fault OutputPinoutSpecificationsVoltages...

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SeekIC No. : 004490991 Detail

Si9961: Features: · 1.8-A H-Bridge Output· Class B Linear Operation· Externally Programmable Gain and Bandwidth· Undervoltage Head Retract· Programmable Retract Current· Low Standby Current· Rail-to-Rail Ou...

Si9961 Data Sheet

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Part Number:
Si9961
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· 1.8-A H-Bridge Output
· Class B Linear Operation
· Externally Programmable Gain and Bandwidth
· Undervoltage Head Retract
· Programmable Retract Current
· Low Standby Current
· Rail-to-Rail Output Swing
· Single 12-V Supply
· System Voltage Monitor with Fault Output




Pinout

Connection Diagram




Specifications

Voltages Referenced to Common Pin
V+ Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 16 V
Pin (FAULT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VCC + 0.3 V
Pin (Output A & B, Source A & B) . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Pin (All Others) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 0.3 V to V+ + 0.3 V
Maximum Clamp Current
Output A, Output B (Pulsed 10 ms at 10% duty cycle) . . . . . . . . . . . 1.8 A
Pin (All Others) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to 150
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70
Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Power Dissipation (Package)a
24-Pin SOICb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.125 W
Thermal Impedance (JA)a
24-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 25 mW/ above 25.




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 70C) temperature range.



Si9961 datasheet




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