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SI9961ACY-T1 Datasheet(PDF) 4 Page - Vishay Siliconix

Part # SI9961ACY-T1
Description  12-V Voice Coil Motor Driver
Download  9 Pages
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9961ACY-T1 Datasheet(HTML) 4 Page - Vishay Siliconix

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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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