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SI9961 датащи(PDF) 1 Page - Vishay Siliconix

номер детали SI9961
подробное описание детали  12-V Voice Coil Motor Driver
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9961 датащи(HTML) 1 Page - Vishay Siliconix

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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


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