SI9961ACY Vishay, SI9961ACY Datasheet

IC, MOTOR DRIVER VOICE COIL 1.8A SOIC-24

SI9961ACY

Manufacturer Part Number
SI9961ACY
Description
IC, MOTOR DRIVER VOICE COIL 1.8A SOIC-24
Manufacturer
Vishay
Type
Voice Coil Motor Driverr
Datasheet

Specifications of SI9961ACY

Motor Type
Voice Coil
No. Of Outputs
2
Output Current
1.8A
Output Voltage
9.1V
Supply Voltage Range
4.5V To 5.5V
Driver Case Style
SOIC
No. Of Pins
24
Operating Supply Voltage
- 0.3 V to + 16 V
Supply Current
13 mA
Mounting Style
SMD/SMT
Package / Case
SO-24
Operating Temperature
0 C to + 70 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SI9961ACY
Manufacturer:
SILI
Quantity:
5 510
Part Number:
SI9961ACY
Manufacturer:
LATTICE
Quantity:
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Part Number:
SI9961ACY
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Part Number:
SI9961ACY-T1
Manufacturer:
VISHAY/威世
Quantity:
20 000
DESCRIPTION
The Si9961A is a linear actuator (voice coil motor) driver
suitable for use in disk drive head positioning systems. The
Si9961A contains all of the power and control circuitry
necessary to drive the VCM that is typically found in 3
hard disk drives and optical disk drives. The driver is capable
of delivering 1.8 A at a nominal supply of 12 V.
The Si9961A 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
Document Number: 70014
S-40845—Rev. H, 03-May-04
FEATURES
D 1.8-A H-Bridge Output
D Class B Linear Operation
D Externally Programmable Gain and
FUNCTIONAL BLOCK DIAGRAM
Bandwidth
RETRACT
SELECT
FAULT
Enable
GAIN
IA2−
I
OA2
V
RET
CC
23
22
10
11
4
5
9
6
R
V
R
INH
1
+
Acceleration Error
12-V Voice Coil Motor Driver
R
INL
2
A2
V
V+
R
Voltage
Monitor
8
D Undervoltage Head Retract
D Programmable Retract Current
D Low Standby Current
R
FB
R
R
24
V
R
I
SENSE
OUT
1
+
Retract
Control
+
7 R
/
8 R
2
V
3
EXT
-inch
REF
A3
7
V
A4
A5
R
V
REF−
+
12
I
SENSE
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 Si9961A is constructed on a self-isolated BiC/DMOS
power IC process. The IC is available in both standard and
lead (Pb)-free, 24-pin SO packages for operation over the
commercial, C suffix (0 to 70_C) temperature range.
IN+
13
I
SENSE
IN−
21
Q1
Q2
D Rail-to-Rail Output Swing
D Single 12-V Supply
D System Voltage Monitor with Fault Output
SA
15
14
GND
V
DD
18
16
SB
20
Q3
Q4
Vishay Siliconix
17
19
OUTPUT
OUTPUT
Si9961A
A
B
www.vishay.com
1

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SI9961ACY Summary of contents

Page 1

... C suffix (0 to 70_C) temperature range. EXT REF REF− Voltage V R Monitor − Retract Control A5 − − INL FB SENSE SENSE SENSE OUT IN+ IN− Si9961A Vishay Siliconix D Rail-to-Rail Output Swing D Single 12-V Supply D System Voltage Monitor with Fault Output OUTPUT OUTPUT GND www.vishay.com 1 ...

Page 2

... Si9961A 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 Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

... OUTB I OUTB 25_C (Max 0 < OUTB DD OUTB RET RET 3. RET Si9961A Vishay Siliconix Limits C Suffix 0 to 70_C = GND = GND = Min Typ g 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 − ...

Page 4

... Low Gain + Where Input offset current may then be calculated as Where Lead (Pb)-Free Temperature Part Number Range Package 0 to 70_C 0 to 70_C (Wide Body) Si9961ACY-T1—E3 vs. VCM current, in Figure 1) are set and R and selected and R that will yield (GAIN SELECT Input = High ...

Page 5

... VCM being driven first approximation, the torque constant and inertia of the VCM may be ignored, although they will have some influence on the final results, especially if large values are involved. (See Figure 1.) Si9961A Vishay Siliconix Back EMF Supply ...

Page 6

... Si9961A 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 this, a compensation amplifier is cascaded with the VCM and its driver ...

Page 7

... 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. Si9961A Transconductance Si9961A Vishay Siliconix and R ) were " 0.5 W ” 500 mA/V m − ...

Page 8

... Si9961A Vishay Siliconix 6.2 kW 0.016 − Gain + − Gain 6 0.016 −5 −8 −11 −14 −17 − 100 Frequency (Hz) FIGURE 4. www.vishay.com Cross-Over − Protection + Cross-Over − Protection + FIGURE 3. Transconductance Amplifier 0 −20 −40 −60 −80 1000 10000 OUT VCM V 1 0 0.016 mF ...

Page 9

... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...

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