View KA3120_4107535.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

PRELIMINARY
HDD PRODUCTS
KA3120
SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER
The KA3120 is an ASIC combination chip, which was designed for the HDD, includes the following functions: spindle motor drive, voice coil motor drive, retract and power management. To drive and control the spindle, the digital ASIC provides the appropriate control signals (Start up, commutation, speed control) to the KA3120. The spindle motor condition is monitored by the FG output and the motor speed control is accomplished via the PWMSP input. The ASIC controls the voice coil motor current via PWMH and PWML inputs and the power management circuit always monitors the power supply voltages.
48-QFPH-1414
FEATURES
SPINDLE MOTOR DRIVE PART * * * * * * * Soft switching Spindle brake after retract Adjustable brake delay time 2.0A max. current power driver Low output saturation voltage: 1V typical @1.6A PWM decoder & filter for soft switching
ORDERING INFORMATION
Device KA3120 Package 48-QFPH-1414 Operating Temperature 0 ~ 70C
The digital circuit (ASIC) based start-up, commutation and motor speed control
VOICE COIL MOTOR DRIVE PART * * * * * * * * Trimmed low offset current 1.2A max. current power driver Gain selection and adjustable gain Automatic power down retract function Class AB linear amplifier with no dead zone Low output saturation voltage: 0.8V typical @1.0A Internal full bridge with VPNP (Vertical PNP) & NPN VCM offset monitoring
Rev. B
MIC-99D001 January 1999
(c) 1999 Fairchild Semiconductor Corporation
1
PRELIMINARY
KA3120
HDD PRODUCTS
POWER MONITORING * * * * Power on reset with delay Hysteresis on both power comparators Over temperature & over current shut down 5V and 12V power monitor threshold accuracy 2%
PACKAGE
* 48QFPH (48 pin quad flat package heat-sink)
APPLICATION
* Hard disk drive (HDD) products
2
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
BLOCK DIAGRAM
POR Vreg Power-on Reset
Interface
FG MCLK Spindle Motor PWMSF Custom Digital ASIC PWMSP Driver
U V W N 3-Phase BLDC Motor
VCM+ VCMOFFSET Gainsel PWMH PWML Voice Coil Motor Driver VCM-
Voice Coil Motor
Retract Brake
MIC-99D001 January 1999
3
PRELIMINARY
KA3120
HDD PRODUCTS
PIN CONFIGURATION
SENSE12
CBRAKE
PWMSP
CCOMP 38
BRAKE
CNTL3
CNTL2
CNTL1
PVCC
CFSP
GND
TAB
48
47
46
45
44
43
42
41
40
39
37
PWMSF CFSF ADJ SENSE5 VDD FG
1 2 3 4 5 6
U
36 35 34 33 32 31
N SUBGND V PCS W SUBGND
TAB
KA3120
TAB
VREF MCLK VCMOFF POR CDLY GAINSEL
7 8 9 10 11 12
30 29 28 27 26 25
ERROUT VDD ERRIN VCM+ PGND SENSEOUT
13
14
15
16
17
18
19
20
21
22
23
24
CFVCM
PWML
CRET2
PWMH
PVCC
CRET
FILOUT
4
MIC-99D001 January 1999
SENSE
RRET
VCC
TAB
SUBGND
VCM-
PRELIMINARY
HDD PRODUCTS
KA3120
PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Symbol PWMSF CFSF ADJ SENSE5 VDD FG VREF MCLK VCMOFF POR CDLY GAINSEL PWMH PWML CFVCM CRET VCC FILOUT SENSE CRET2 PVCC VCM(-) SUBGND RRET SENSEOUT PGND VCM(+) ERRIN VDD ERROUT SUBGND W I/O I - - I - O O I O O - I I I - - - O I - - - - I O - - I - O - O Description PWM input for spindle soft switching Capacitor for spindle PWM soft switching filter Reference voltage adjustable Adjustable threshold voltage to 5V 5V power supply Frequency generation to spindle speed Voltage reference output for ASIC power Clock from ASIC for switching VCM output offset monitoring pin Power On Reset Delay capacitor for power on reset VCM Amplifier gain selection PWM signal input (MSB) PWM signal input (LSB) Filter capacitor for VCM PWM control Delay capacitor for retract 12V power line VCM PWM output VCM current sense input Power for VCM retract 12V power line for VCM output VCM negative output Ground Adjustable maximum retract current VCM current sense Amplifier output Ground VCM positive output VCM error Amplifier negative input 5V power supply VCM error Amplifier output Ground Spindle motor W phase output
MIC-99D001 January 1999
5
PRELIMINARY
KA3120
HDD PRODUCTS
PIN DESCRIPTION (Continued)
Pin No. 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol PCS V SUBGND N U CCOMP BRAKE CBRAKE PVCC SENSE12 GND CNTL1 CNTL2 CNTL3 PWMSP CFSP I/O O O - I O - O - - I - I I I I - Description Spindle soutput current sensing Spindle motor V phase output Ground Spindle motor neutral point Spindle motor U phase output Spindle output control compensation Dynamic brake Back-EMF charging capacitor for brake power 12V power line for spindle Adjustable for threshold voltage to 12V Ground Control input for spindle and brake Control input for start-up clock and soft switching Control input for VCM Amplifier & retract PWM input for spindle speed control Filter capacitor for spindle PWM control
6
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
EQUIVALENT CIRCUITS
PWM decoder filter input PWM decoder filter Capacitor
VDD
VDD +
22 #1, #47 #2, #48 + -
-
100
Internal switch
Internal 2.5V
Regulator part
SENSE input
VDD VDD 27 #3 VDD #4 Internal 1.3V + - 27
#7
FG output
MCLK input
VDD
VDD
50k 27 #6 #8 27 50k
50k
MIC-99D001 January 1999
7
PRELIMINARY
KA3120
HDD PRODUCTS
EQUIVALENT CIRCUITS (Continued)
VCM offset compensation output Power on reset part
VDD VDD 27 #11 20k 27 #9 27 Internal Switch #10 VDD 50k + - Internal 2.5V VDD
15
VCM gain selection input
VDD
VCM PWM high input
VDD
27 #12
10k #13 10k
27
10k
500
Internal switch
VCM PWM low input
VCM PWM filter Capacitor
VDD VCC, 12V 27 #14 #15 + - 15.6 4k
+ - + -
Internal switch
Internal 4V
8
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
EQUIVALENT CIRCUITS (Continued)
Filtered VCM PWM command output VCM current sense input
VDD VCC + #18 - Internal DEC OUT #19
Capacitor for retract power
Max. retract current set input
U 30 VCC
V
W VCC
27 #20 Retract Block #24
20k
Spindle motor output compensation Capacitor
Spindle motor output and Back EMP sensing part
VCC VDD VCC #32, 34, 37 VCC 60 #38 #33 VCC 60 #36 Retract Block
- + + -
Internal 4.2V
MIC-99D001 January 1999
9
PRELIMINARY
KA3120
HDD PRODUCTS
EQUIVALENT CIRCUITS (Continued)
Dynamic break part CNTL1, 2, 3 input
VCC VDD 40 VDD 2k #40 27 #44, #45, #46 27 #39
VCC
U
VCM output and control part
Internal 1/2 VCC VCC - #30 Internal 4V VCC + 60 #28 VCC + - - #22 #42 + #27
Sense12 input
VCC
60
- #25 +
#19
Internal 4V
10
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
ABSOLUTE MAXIMUM RATING (Ta=25C)
Characteristics Maximum signal block supply voltage for 5V line Maximum signal block supply voltage for 12V line Maximum power block supply voltage for 12V line Maximum output current Power dissipation Storage temperature Maximum junction temperature Operating ambient temperature Symbol VDDMAX VCCMAX PVCCMAX IOMAX PD TSTG TJMAX TA Value 6 15 15 2 3.0 note -55 ~ 125 150 0 ~ 70 Unit V V V A W C C C
NOTE: 1. When mounted on 50mm x 50mm x 1mm PCB (Phenolic resin material) 2. Power dissipation is reduced 16mV / C for using above Ta=25C. 3. Do not exceed Pd and SOA.
Pd[mW] 3,000
2,000
1,000 0
0
25
50
75
100
125
150
175
Ambient temperature, Ta [C]
RECOMMENDED OPERATING CONDITIONS
Characteristics Supply voltage Supply voltage in logic part Symbol VCC, PVCC2 VDD Min. 10.8 4.5 Typ. 12.0 5.0 Max. 13.2 5.5 Unit V V
MIC-99D001 January 1999
11
PRELIMINARY
KA3120
HDD PRODUCTS
ELECTRICAL CHARACTERISTICS
(Ta=25C, unless otherwise specified) Characteristic SUPPLY CURRENT 5V line supply current 1 5V line supply current 2 5V line supply current 3 5V line supply current 4 12V line supply current 1 12V line supply current 2 12V line supply current 3 12V line supply current 4 POWER MONITOR Threshold voltage1 level for 12V Threshold voltage2 level for 12V Hysteresis on 12V comparator Adjustable pin voltage for 12V Threshold voltage level1 for 5V Threshold voltage level2 for 5V Hysteresis on 5V comparator Adjustable pin voltage for 5V POWER ON RESET GENERATOR
Charging current for POR Capacitor
Symbol
Test conditions
Min.
Typ.
Max.
Unit
IDD1 IDD2 IDD3 IDD4 ICC1 ICC2 ICC3 ICC4
CNTL1=0V - CNTL1=CNTL3=5V CNTL3=0V CNTL1=0V - CNTL1=CNTL3=5V CNTL3=0V
40 15 15 15 4 4 10 4
50 20 20 20 7 7 30 7
60 25 25 25 15 15 50 15
mA mA mA mA mA mA mA mA
VTH12 VTH12b VHYS12 V12 VTH5 VTH5b VHYS5 V5
VCC=Sweep, VDD=5V VCC=Sweep, VDD=5V VCC=Sweep, VDD=5V VCC=12V, VDD=5V VCC=12V, VDD=Sweep VCC=12V, VDD=Sweep VCC=12V, VDD=Sweep VCC=12V, VDD=5V
9.1 8.9 100 3.0 3.9 3.8 50 2.85
9.4 9.2 200 3.2 4.1 4.0 100 3.0
9.8 9.6 300 3.4 4.4 4.3 150 3.25
V V mV V V V mV V A V V V ms
ICPOR VTHPOR VPOH VPOL TdPOR
VCC=12V, VDD=5V CDLY=Sweep VCC=12V, VDD=5V VCC=12V, VDD=5V CDLY=220nF
-17.0 -14.0 -10.0 2.3 4.5 0 - 2.5 - - 40 2.7 VDD 0.5 -
POR threshold voltage Output high voltage Output low voltage Power on reset delay CONTROL INPUT Logic control input 1 MED voltage Logic control input 1 MED current Logic control input 1 HIGH voltage Logic control input 1 HIGH current Logic control input 1 LOW voltage Logic control input 1 LOW current
VCTL10 ICTL1 VCTL1H ICTL1H VCTL1L ICTL1L
CNTL1=2.5V CNTL1=2.5V CNTL1=Sweep CNTL=5V CNTL1=Sweep CNTL1=0V
2.3 -5 3.8 60 0.5 -100
2.5 0 4.2 80 0.8 -80
2.7 5 4.6 100 1.2 -60
V A V A V A
LOGIC CONTROL INPUT2 & 3 SPEC'S ARE EQUAL TO LOGIC CONTROL INPUT1
12
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic START-UP HOLD CHECK Start-up hold check1 Start-up hold check2 START-UP MODE CHECK Start-up mode check1 Start-up mode check2 RUNNING MODE CHECK BEMF threshold voltage FG output high voltage FG output low voltage Running mode check1 Running mode check2 SPINDLE FG GENERATION FG frequency FG duty SPINDLE PWM CONTROL PWM high level input voltage PWM low level input voltage High input current at PWMSP
CFSP voltage2(100% duty of PWMSP)
Symbol
Test conditions - - - - - - - U=V=W=5V, N=100Hz U=V=W=5V, N=100Hz
Min.
Typ.
Max.
Unit
SHM1 SHM2
0 0
0.2 0.2
0.5 0.5
V V
STM1 STM2
0 0
0.2 0.2
0.5 0.5
V V
VBTH VFGH VFGL RM1 RM2
65 4.5 0 90 90
80 4.8 0.2 100 100
95 5.0 0.5 110 110
mV V V Hz Hz
FG DTFG
U,V,W=120 shift pulse(1KHz) U,V,W=120 shift pulse(1KHz) - - PWMSP=100% duty PWMSP=100% duty PWMSP=0% duty PWMSP=0% duty - PWMSP=50% duty PWMSP=0%, CFSP=2.5V SPMSP=100%, CFSP=2.5V
2.9 45
3 50 - - 105 1.7 -105 3.3 1.6 2.5 -150 150
3.1 55 - 2.0 125 1.9 -85 3.5 1.8 2.6 -130 180
kHz %
VSPMH VSPML IPSP1 VSP2 IPSP2 VSP1 VSPD VSP3 ICFSP1 ICFSP2
3.0 - 85 1.4 -125 3.1 1.5 2.4 -180 130
V V A V A V V V A A
Low input current at PWMSP
CFSP voltage1(0% duty of PWMSP)
CFSP voltage amplitude CFSP voltage3 (50% of PWMSP) CFSP charging current CFSP discharge current
MIC-99D001 January 1999
13
PRELIMINARY
KA3120
HDD PRODUCTS
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic SPINDLE PWM SOFT SWITCHING PWM high level input voltage PWM low level input voltage High input current at PWMSF
CFSF voltage2(100% duty of PWMSF)
Symbol
Test conditions - - PWMSF=100% duty PWMSF=100% duty PWMSF=0% duty PWMSF=0% duty - PWMSF=50% duty PWMSF=0%, CFSP=2.5V SPMSF=100%, CFSP=2.5V - (Test only) -
Min.
Typ. - - 100 2.75 -100 2.25 500 2.5 -90 110
Max. - 2.0 125 2.85 -85 2.35 550 2.6 -70 130
Unit
VSFMH VSFML IPFP1 VSF2 IPSF2 VSF1 VSFD VSF3 ICFSF1 ICFSF2
3.0 - 85 2.65 -125 2.15 450 2.4 -110 90
V V A V A V mV V A A
Low input current at PWMSF CFSF voltage1(0% duty of PWMSF) CFSF voltage amplitude CFSF voltage3 (50% of PWMSF) CFSF charging current CFSF discharge current BRAKE CBrake output voltage Brake output high voltage Brake output low voltage SPINDLE OUTPUT U saturation voltage_upper5 V saturation voltage_upper5 W saturation voltage_upper5 U saturation voltage_lower5 V saturation voltage_lower5 W saturation voltage_lower5 U output frequency V output frequency W output frequency
VBC VBH VBL
11.0 - 0
11.3 VDD 0.2
11.5 - 0.5
V V V
VSU5U VSU5V VSU5W VSV5L VSU5L VSU5L FU FV FW
RU,RV,RW=5 RU,RV,RW=5 RU,RV,RW=5 RU,RV,RW=5 RU,RV,RW=5 RU,RV,RW=5 CNTL2=12KHz CNTL2=12KHz CNTL2=12KHz
0.2 0.2 0.2 0.2 0.2 0.2 0.9 0.9 0.9
0.3 0.3 0.3 0.3 0.3 0.3 1 1 1
0.5 0.5 0.5 0.5 0.5 0.5 1.1 1.1 1.1
V V V V V V KHz KHz KHz
14
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic SPINDLE OUTPUT U phase high duration time U phase middle duration time V phase high duration time V phase middle duration time W phase high duration time W phase middle duration time Leakage current U upper Leakage current V upper Leakage current W upper Leakage current U lower Leakage current V lower Leakage current W lower U sourcing current 0.2V V sourcing current 0.2V W sourcing current 0.2V Transconductance gain U upper Transconductance gain U lower Transconductance gain V upper Transconductance gain V lower Transconductance gain W upper Transconductance gain W lower CCOMP charging current1 CCOMP charging current2 CCOMP charging current3 TUH TUM TVH TVM TWH TWM IULQU IVLQU IWLQU IULQL IVLQL IWLQL IOU02 IOV02 IOW02 GMUH GMUL GMVH GMVL GMWH GMWL ICOMP1 ICOMP2 ICOMP3 CNTL2=12KHz CNTL2=12KHz CNTL2=12KHz CNTL2=12KHz CNTL2=12KHz CNTL2=12KHz - - - - - - - - - PWMSP=sweep, RU,RV,RW=5 PWMSP=sweep, RU,RV,RW=5 PWMSP=sweep, RU,RV,RW=5 PWMSP=sweep, RU,RV,RW=5 PWMSP=sweep, RU,RV,RW=5 PWMSP=sweep, RU,RV,RW=5 PWMSP=0% PWMSP=50% PWMSP=100% 300 600 300 600 300 600 -1 -1 -1 -1 -1 -1 3.0 3.0 3.0 0.8 0.8 0.8 0.8 0.8 0.8 -20 -200 -400 333 666 333 666 333 666 0 0 0 0 0 0 4.0 4.0 4.0 0.9 0.9 0.9 0.9 0.9 0.9 0 -250 -500 360 720 360 720 360 720 1 1 1 1 1 1 5.0 5.0 5.0 1.0 1.0 1.0 1.0 1.0 1.0 20 -300 -600 s s s s s s A A A A A A A A A A/V A/V A/V A/V A/V A/V A A A Symbol Test conditions Min. Typ. Max. Unit
MIC-99D001 January 1999
15
PRELIMINARY
KA3120
HDD PRODUCTS
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic COMUTATION CONTROL U stair high U stair middle U stair low U stair frequency V stair high V stair middle V stair low V stair frequency W stair high W stair middle W stair low W stair frequency Com high Com low Com frequency COMUTATION CONTROL SOFT U stair frequency_soft V stair frequency_soft W stair frequency_soft Com frequency_soft Com high voltage_soft1 Com low voltage_soft1 Com high voltage_soft2 Com low voltage_soft2 REGULATOR Adjustable PIN voltage Regulator output voltage Regulator line regulation Regulator load regulation VADJ VREG RLINE RLOAD
VDD=5V,R3a=15K,R3b=10K VDD=5V,R3a=15K,R3b=10K
Symbol
Test conditions - - - - - - - - - - - - - - - - - - - - - - -
Min.
Typ.
Max.
Unit
VUSTH VUSTM VUSTL FUST VVSTH VVSTM VVSTL FVST VWSTH VWSTM VWSTL FWST VCOMH VCOML FCOM
2.85 2.35 1.85 0.9 2.85 2.35 1.85 0.9 2.85 2.35 1.85 0.9 2.6 2.1 2.8
3.0 2.5 2.0 1.0 3.0 2.5 2.0 1.0 3.0 2.5 2.0 1.0 2.75 2.25 3.0
3.15 2.65 2.15 1.1 3.15 2.65 2.15 1.1 3.15 2.65 2.15 1.1 2.9 2.4 3.2
V V V KHz V V V KHz V V V KHz V V KHz
FUSTSF FVSTSF FWSTSF FCSF VCHSF1 VCLSF1 VCHSF1 VCLSF1
0.9 0.9 0.9 2.9 2.65 2.15 2.65 2.15
1.0 1.0 1.0 3 2.75 2.25 2.75 2.25
1.1 1.1 1.1 3.1 2.85 2.35 2.85 2.35
KHz KHz KHz KHz V V V V
1.2 3.1 0 0
1.3 3.3 0.5 0.5
1.4 3.5 1.0 1.0
V V % %
VDD=sweep VDD=5V
16
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic SPINDLE MCLOCK High threshold voltage Low threshold voltage High input current High input current VCM PWM CONTROL High PWMH input current Low PWMH input current High PWML input current Low PWML input current PWMH high level input voltage PWMH low level input voltage PWML high level input voltage PWML low level input voltage CFVCM voltage1 CFVCM voltage2 CFVCM voltage3 CFVCM voltage4 CFVCM voltage5 CFVCM voltage6 CFVCM voltage7 CFVCM voltage8 CFVCM voltage9 PWM current ratio (VCM) PWMH current variation PWML current variation VCM PWM FILTER Maximum phase shift Filter cut-off frequency Filter attenuation at 1MHz FCO FILTER Measure at 500HZ, CFVCM=10nF - - - - - - 100 70 2 - - deg A dB IPWMH1 IPWMH2 IPWML1 IPWM2 VPWMH1 VPWMH2 VPWML1 VPWM2 VCFVC1 VCFVC2 VCFVC3 VCFVC4 VCFVC5 VCFVC6 VCFVC7 VCFVC8 VCFVC9 RPWM IVPWM IVPWM PWMH=100% PWMH=0% PWML=100% PWML=0% - - - - PWMH=100%,PWML=100% PWMH=100%,PWML=50% PWMH=100%,PWML=0% PWMH=50%,PWML=100% PWMH=50%,PWML=50% PWMH=50%,PWML=0% PWMH=0%,PWML=100% PWMH=0%,PWML=50% PWMH=0%,PWML=0% - - - 100 -130 100 -130 3.0 - 3.0 -130 5.90 5.80 5.70 3.90 3.80 3.70 1.90 1.80 1.70 30 0.8 27 113 -113 113 -113 - - - -113 6.06 6.00 5.94 4.06 4.00 3.94 2.06 2.00 1.94 32 1.0 32.3 130 -100 130 -100 - 2.0 - -100 6.30 6.20 6.10 4.30 4.20 4.10 2.40 2.30 2.20 34 1.2 36 mA A A A A A V V V V V V V V V V V V V VMH VML IMH IML - - - - 2.0 - 15 -10 1.4 1.4 25 0 - 0.8 35 10 V V A A Symbol Test conditions Min. Typ. Max. Unit
MIC-99D001 January 1999
17
PRELIMINARY
KA3120
HDD PRODUCTS
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic VCM REFERENCE VOLTAGE VCM reference voltage VCM ERROR AMPLIFIER Amplifier output high Amplifier output low Short circuit current Input offset voltage Errot amplifier open loop gain Unit gain bandwidth VCM SENSE AMPLIFIER Amplifier output high Amplifier output low Short circuit current Input offset voltage Unit gain bandwidth Sense amplifier voltage gain1 Sense amplifier voltage gain2 VCM POWER AMPLIFIER Power Amplifier gain1 Power Amplifier gain2 Power Amplifier output high voltage1 Power Amplifier output high voltage2 Power Amplifier output low voltage1 Power Amplifier output low voltage2 Input offset voltage Unit gain bandwidth1 Unit gain bandwidth2 VCM OFFSET COMPARATOR Offset comparator high voltage Offset comparator low voltage Offset comparator offset voltage Offset comparator hysteresis VOCH VOCL VOCOS VOCHYS MIC-99D001 January 1999 - - - - 4.5 0 - 5 4.8 0.2 0 10 5.0 0.5 - 15 V V mV mV APO1 APO2 VPOH1 VPOH2 VPOL1 VPOL2 VOSE BG P1 BG P2 - - - - - - - - - 24 24 11.5 11.5 0 0 -15 - - 24.6 24.6 11.8 11.8 0.2 0.2 0 2 2 25 25 12.0 12.0 0.5 0.5 15 - - dB dB V V V V mV MHz MHz VSOH VSOL ISSC VOSE BGS AVS1 AVS2 - - - - - Gainsel=5V Gainsel=5V 10.8 0.5 10 -15 - - - 11.2 0.8 - 0 3.4 24 6 11.5 1.2 - 15 - - - V V mA mV MHz dB dB VEOH VEOL IESC VOSE AVE BGE - - - - - - 10.8 0.5 10 -15 - - 11.2 0.8 - 0 80 2.3 11.5 1.2 - 15 - - V V mA mV dB MHz VREF CNTL3=5V 3.8 4.0 4.2 V Symbol Test conditions Min. Typ. Max. Unit
18
PRELIMINARY
HDD PRODUCTS
KA3120
ELECTRICAL CHARACTERISTICS (Continued)
(Ta=25C, unless otherwise specified) Characteristic VCM AMPLIFIER TOTAL VCM offset current VCM transconductance gain high VCM transconductance gain low VCM+ saturation voltage lower VCM- saturation voltage upper VCM+ saturation voltage upper VCM- saturation voltage lower VCM+ saturation voltage lower VCM- saturation voltage upper VCM+ saturation voltage upper VCM- saturation voltage lower Leakage current power Amplifier1 Leakage current power Amplifier2 RETRACT Min. operating voltage of CRET2 Source voltage Sinking saturation voltage Retract sinking current1 Retract sinking current2 Retract sinking current3 Cret charging current1 Retract power Tr. leakage upper Retract power Tr. leakage lower THERMAL SHUT DOWN Operating temperature Thermal hysteresis TSD THYS - - 135 20 150 30 165 40 C C VCRET2 VSRC VRTSAT IRCT1 IRCT2 IRCT3 ICRET ILRET1 ILRET1 CRET2=Sweep CRET2=5V CRET2=5V Rret=8.0K Rret=4.2K Rret=2.7K - - - - 0.8 - 40 80 130 90 -1 -1 3.0 1.0 - 48.2 91.8 143 100 0 0 - 1.2 0.5 60 100 155 110 1 1 V V V mV mV mV A A A IOSVCM GMVH GMVL VVMS1 VVMS2 VVMS3 VVMS4 VVMS5 VVMS6 VVMS7 VVMS8 IVCML1 IVCML2 PWMH=PWML=50% duty Gainsel=0V Gainsel=5V Rvcm=15 Rvcm=15 Rvcm=15 Rvcm=15 Rvcm=15 Rvcm=15 Rvcm=15 Rvcm=15 - - -15 0.47 0.1 - - - - - - - - -10 -10 0 0.50 0.125 - - - - - - - - 0 0 15 0.53 0.15 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 10 10 mA A/V A/V V V V V V V V V A A Symbol Test conditions Min. Typ. Max. Unit
MIC-99D001 January 1999
19
PRELIMINARY
KA3120
HDD PRODUCTS
APPLICATION INFORMATION
SPINDLE MOTOR DRIVE PART The KA3120 is a combination chip consisting of spindle motor and voice coil motor designed for HDD system. According to the spindle conditions, the digital ASIC circuit provides optimum control signals (Start-up, commutation, speed control, and switching mode) to the KA3120. Detection of the back-EMF (BEMF) of the spindle motor has to be output to an external digital circuit via FG. The MCLK and PWM signals are used to determine the commutation timing and to control the spindle speed, respectively.
SPINDLE DRIVER The spindle includes both low and high side drivers (H-bridge) for a three-phase sensorless brushless DC motor. To reduce the saturation voltage, the vertical PNP Tr is used as the high side driver.
FREQUENCY GENERATION (FG) FG stands for Frequency Generation. It is the out signal toward the digital ASIC. Representing the current spindle speed frequency, it contains important information about the motor speed and motor spin. According to the FG frequency, the digital ASIC provides different motor clock signals to the motor drive IC via MCLK and checks the motor speed to send the VCM enable signal via CNTL3. FG frequency (Hz), motor speed (rpm) and pole number are directly related as shown below in the three phase motor. FG frequency = motor speed x pole number x 3 / 120 In a typical application,(8 pole motor) FG frequency = 5400 x 8 x 3 / 120 = 1080Hz FG frequency = Output frequency x 3
20
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
MCLK & MASK The MCLK is a motor clock used as the standard clock signal for the proper commutation timing of the spindle motor. It is supplied by the ASIC. As shown in table 1, it has different delay times depending on the mode of the spindle speed. Table 1. MCLK & MASK Delay Time to the Spindle Speed. Table 1. MCLK & MASK delay time to the spindle speed MCLK (Td) Start-up mode Acceleration mode Running mode External ASIC FG(n-1) / 2 FG(n-1) / 32 MASK 1ms FG(n-1) / 4 344.45s Switching Hard switching Hard switching Soft switching
After the FG_Edge signal, the MCLK occurs after a half FG_Edge delay time in the acceleration mode and 1/ 32 FG_Edge delay time in the soft switching mode.
MASK When the coil current is abruptly changed in a short time interval, a spark voltage occurs. This spark voltage mixes with the FG output to give the wrong spindle information to the ASIC. To eliminate the spark voltage from the FG output, the masking block is needed.
di Vcoil = - L ---dt
W_BEMF V_BEMF U_ BEMF
U_Comp
120
V_Comp
W_Comp 60 FG
FG_Edge Electrically 30 Delay MCLK
Figure 1. BEM, FG, and MCLK in the acceleration mote MIC-99D001 January 1999
21
PRELIMINARY
KA3120
HDD PRODUCTS
FG 8msec
Switching noise, false zero cross
FG 2msec 2msec
MCLK 1msec 1msec
MASK
Figure 2. MCLK vs MASK in the start-up mode
FG 8msec, T1
T2
Switching noise, false zero cross
FG T1/2 T2/2
MSLK
T1/4
T2/4
MASK
Figure 3. MCLK vs MASK in the acceleration mode
22
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
PWMDEC AND SPEED CONTROL
Motor speed is measured by the ASIC via the FG output. The digital ASIC compares FG frequency with the target motor speed and sends the speed compensation signal to the PWMSP input of the KA3120. This PWM signal is internally filtered and is converted into DC voltage through the built-in PWM Decoder Filter. The analog output of the filter depends on the duty of the PWM signal. The filter is a 3rd order, low-pass filter. The first pole location of the filter is determined by the external capacitor connected to pin(48) CFSP.
0.625 Ispindle = ( D - 0.1 ) ------------------------------R33 ( = 0.25 )
Figure 4. Spindle current vs PWMSP duty variation
START-UP MODE The BEMF is used in the sensorless BLDC motor driver to determine the rotor position. The detected rotor position is a very important information to control the motor speed and the commutation timing. At standstill condition, there is no BEMF voltage and no FG output. There is no information about the motor position. However the spindle motor must be started up at standstill. To drive the spindle at the start-up mode, the digital ASIC sends the spindle enable signal via CNTL1 and supplies the HIGH or OPEN signal in turns via CNTL2 to be used as commutation signal of the spindle motor.
MIC-99D001 January 1999
23
PRELIMINARY
KA3120
HDD PRODUCTS
The digital ASIC continuously provides HIGH or OPEN signal until the BEMF generated is enough large to produce the FG signal i.e. the spindle motor can be driven by the self commutation. During a fixed time, if the BEMF generated is too small and the spindle motor is not driven by the self commutation, the ASIC resets all signals sent and retries the spindle. Table 2. Pin setup truth table CNTL1(1) SPM driver High (5V) Open (Floating) Low (0V) 1 0 0 Brake 0 0 1 CNTL2(2) S/W Hard S/W Hard S/W Soft S/W CNTL3(3) VCM driver 1 0 0 Retract 0 0 1 GAINSEL SPM driver Normal x Start Hold up(4) VCM gain 0.125 x 0.5
NOTES: 1. CNTL1: Spindle motor control 2. CNTL2: Switching mode control 3. CNTL3; VCM motor control 4. Test only 5. "1": Enable; "0": disable; "S/W": switching
ACCELERATION MODE When the BEMF detected is enough to be used as the information of motor position, the mode is changed from start-up to acceleration. The ASIC sends the optimum commutation timing signal via MCLK according to the FG input. By using the BEMF, the spindle is self-commuted at acceleration and running modes. During the motor drive, the spindle motor is commuted at that point which is electrically 30 delayed after the FG_Edge generates.
RUNNING MODE It is called to the running mode when the spindle motor speed arrives within 1% of the target speed. The switching mode, commutation delay time, MCLK delay time (Td) and masking time are changed at the running mode. The spindle motor speed is controlled by PWM signal within 0.01%. The soft switching using the current slope of the motor may reduce noise, EMI (Electromagnetic Interference) and spark voltage which is generated on the motor coil at the switching.
24
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
CNTL1 SPIN ON
High Open High
CNTL2
Open Low
FG +1% Target RPM -1%
Rotation Speed Start-Up Hard-Switching Soft-Switching
Internal Ready 10msec Internal Switching Mode Change 100msec CNTL3 VCM ON High Open High, 5V CASE1 : High gain Low, 0V High, 5V CASE1 : Low gain Low, 0V VCM Enable
Figure 5. Motor start-up sequence
Duty (%) 100%
D%
0
F trarget
FG Frequency
Figure 6. FG vs PWMSP duty variation MIC-99D001 January 1999
25
PRELIMINARY
KA3120
HDD PRODUCTS
(1) Acceleration Mode: Hard-Switching Mode
+ U_BEMF 0 -
+ V_BEMF 0 -
+ W_BEMF 0 -
SOURCE Iu SINK
SOURCE Iv SINK
SOURCE Iw SINK
(2) Running Mode: Soft-Switching Mode
SOURCE Iu SINK
SOURCE Iv SINK
SOURCE Iw SINK
Figure 7. Acceleration and running the spindle motor
26
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
Start
High frequency Noise Elimination
Using filtered FG Generate start Counter
Counting the FG duration
Hard Switching
NO
Saturation =?
NO MCLK = FG(n-1)/32 MASK = 344.45usec Running MCLK = FG(n-1)/2 MASK = 344.45usec
YES Waiting 2msec MCLK generation
Acceleration Retry MASK = 1msec FG polarity Check = SAME?
YES Start up Keep going Waiting for FG edge
Store count Value of the FG
Figure 8. MCLK generation flow chart
MIC-99D001 January 1999
27
PRELIMINARY
KA3120
HDD PRODUCTS
VOICE COIL MOTOR VCM driver The voice coil motor driver is linear, class AB, H-bridge type driver, and it includes all power transistors. After the VCM is enabled via CNTL3, the VCM current level is controlled by two PWM signals. The input voltage level at pin PWMH weighs, at a maximum, 32 times more than the input voltage at pin PWML. These PWM signals are filtered by an internal second-order low-pass filter and converted into PWMOUT (DC Voltage). The filter PWMOUT depends only on the duty factor and not on the logic level. The PWM Filter's pole is adjustable by pin CFVCM connected to the external capacitor.
R1 PWMH input 13
Vin R2
- Gm +
VREF(4V)
C1
1/2 VDD
R1 PWML input 14
Vin R2
A - Gm + 15 CFVCM
+ -
R1
R1
- PWMOUT
C1 1/2 VDD
+
1/2 VDD
Figure 9. PWM decoder & filter schematic 2
4V
1/2VCC R5
- +
R7 VCM+ 27 v+ L motor
+ Vin + (PWMDEC OUT) - va vx -
R5 R5 + R5 - Sense 19 Imotor R4 22 vb - + R3 R3 R6 + - vs VCM-
RL
Rsense v-
Filtout 18
Errin 28
Errout
Senseout 30 25
R18
Rexif
Cexif R25
Figure 10. VCM driver schematic MIC-99D001 January 1999
28
PRELIMINARY
HDD PRODUCTS
KA3120
The transconductance of VCM AMPLIFIER gain, Gm, is:
Imotor 2 Aerror Apower R25 Gm = ----------------- = ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------2 R18 Rsense As Aerror Apower + ( R18 + R25 ) ( Zmotor + Rsense ) Vin 1 Aloop R25 1 Gm = ------------------------ --------- ------------------ ----- 1 + Aloop R18 Rsense As 2 R18 As Aerror Apower Aloop = -------------------------------------------------------------------------------( R18 + R25 ) ( Zmotor + Rsense )
Therefore Aloop >>1,
1 1 R25 Gm --------- ------------------ ----R18 Rsense As
The transconductance (Gm) can be adjusted by selecting the external components R18, R25 and sense resister Rsense. if R18 = 15k, R25 = 15k, Rsense = 1 GAINSEL = 0(0V), 1 / AS = 0.5 Gm = 0.5 GAINSEL = 1(5V), 1 / AS = 0.125 Gm = 0.125 VCM current (Imotor) is: GAINSEL = 0(0V)
1 R25 1 Imotor = 4 x ( PWMH - 0.5 ) + ----- ( PWML - 0.5 ) x --------- x ------------------ x 0.43 32 R18 Rsense
GAINSEL = 1(5V)
1 R25 1 Imotor = 4 x ( PWMH - 0.5 ) + ----- ( PWML - 0.5 ) x --------- x ------------------ x 0.11 32 R18 Rsense
Recommended value PWMH(100%) = 1 R18 = R25 = 15k PWMH(50%) = 0.5 Rsense = 1 PWMH(0%) = 0
MIC-99D001 January 1999
29
PRELIMINARY
KA3120
HDD PRODUCTS
RETRACT CIRCUIT The retract function is the operation where the VCM moves from the data zone to the parking zone when off normal state power and abnormal power interrupt cause the spindle to stop.
From Spindle Bandgap Reference + x 320 _ Iretdly Retract Enable VA Iref
20
Cret2
27
Iret
Motor
2K Low side Control
19
16 Cret Rret
24
Figure 11. Retract block schematic
VA = 2.0V VA Iref = ----------------------Rext + 2k Iret = Iref x 320
Cret x 2.0V Tretdly = -----------------------------------------Iretdly ( = 100 )
30
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
POWER MANAGEMENT FEATURES
LOW POWER INTERRUPT: The low power interrupt operation occurs when the power supply voltage (5V,12V) level drops below each threshold voltage. The threshold voltage (Vth) and time delay (Tdly) may be adjustable by the external component value.
Vth Tdly = CDLY -------- ,( Vth = 2.5V , I = 14A) I
VDD 11 VDD VCC I = 14A R7 R4 + 5V SENSE 12V SENSE 42 R8 R5 4 + + _ Q15 12 _ POR CDLY
2.5V
Figure 12. Power on reset block schematic
MIC-99D001 January 1999
31
PRELIMINARY
KA3120
HDD PRODUCTS
POWER ON RESET The power-on reset circuit monitors the voltage level of both +5V and +12V power supplies. The power-on reset circuit disables the spindle out block, the whole VCM block, and the digital ASIC when the power supply voltage level drops below the reference voltage.
VDD, VCC Vth Vhys
T POR
Tdly Vbe
T
Figure 13. Power on reset function
Vhys = 4.2mV R4 + R5 VDD ;Vhys ( 5V ) = -------------------- x Vhys R5 R7 + R8 VDD ;Vhys ( 12V ) = -------------------- x Vhys R8
Default (pin4, pin42 : not connected)
VDD, th 4.1V VCC ,th 9.4V
32
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
REGULATOR The KA3120 includes the regulator block which supplies power of the digital ASIC. It consists of the bias block, the band gap reference, the error amp and the external NPN power Tr. The regulator voltage can be adjusted by the external resistor, R3a, R3b.
R3a Vreg = Vref 1 + ---------- , Vref = 1.3V R3b
VDD
Bias Block
Bandgap Reference
Vref
+ 7 -
VREF
VREG R3a Vadjust 3
R3b
Figure 14. low drop regulator schematic
if R3a = 15k, R3b = 10k
R3a 15k Vreg = Vref 1 + ---------- = 1.3 x 1 + -------- = 3.25V R3b 10k
MIC-99D001 January 1999
33
PRELIMINARY
KA3120
HDD PRODUCTS
STR_CLK BEMF DETECTIO N STR_MASK
U_OUT
FG
Figure 15. Start-up mode
MCLK*2
U_OUT
FG
Figure 16. Acceleration mode 1
34
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
T1/4
2msec T1/2 MCLK*2 T1 U_OUT
FG
Figure 17. Acceleration mode 2
U_OUT
V_OUT
W_OUT
Figure 18. Output in hard-switching mode
MIC-99D001 January 1999
35
PRELIMINARY
KA3120
HDD PRODUCTS
Switching Mode Conterting
FG
COM
Output
Figure 19. Switching mode converting
U_OUT
V_OUT
W_OUT
Figure 20. Soft-switching mode
36
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
CNTL3
Filou t
Ivcm
CNTL3
Filou t
Ivcm
PW MH
Filou t Ivcm
Figure 21. VCM recalibration flow
MIC-99D001 January 1999
37
PRELIMINARY
KA3120
HDD PRODUCTS
POR
CBREAK
Vout Iret
Figure 22. Retract & break at power off
38
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
TYPICAL APPLICATION CIRCUIT
5V Q1 C11 4 42 11 7 3 VREF ADJ SENSE15 SENSE12 CDLY Power Bandgap POR 10 Reference On & Bias Reset FG 6 Zero Cross Detector R3a R3b GND
43 N V 39 M39a C39 W M39b
Brake AMP
FG Generator
U V W Brake Cbrake
36
Brake
C40 40
MCLK 8 CNTL1 44 CNTL2 45 CNTL3 46 C38 38 PWMSP C48 PWMSF 1 C2 2 CCOMP PWM Decoder Filter PWM Decoder Filter Retract VCM enable PWMH PWML C15 15 12 ERR_Amplifier SENSE Amplifier VCM- VDD 29 SENSE VCMOFF 9 23, 35 GND R25 R18 C30 R30 SENSEOUT 25 18 ERRIN 28 ERROUT 30 17 VCC 5 VDD 26 PGND AMP SENSE Amplifier AMP AMP VCM- 13 14 PWM Decoder Filter FILOUT VCM+ Retract VCM- 16 CRET C16 24 RRET Vlimit AMP 3 State Input Control Commutation & Spindle Motor Control 37 V 3-phase Output Driver 34 W 32 R33 33 PCS SUBGND D20 U V W 20 CRET2 R24 C20 12V 41 PVCC U
47 48
31 Thermal Shutdown
VCMREF4V
21 PVCC 22 Rsense SENSE AMP VCM+ 19 VCM 27
GAINSEL
MIC-99D001 January 1999
39
PRELIMINARY
KA3120
HDD PRODUCTS
APPLICATION CIRCUIT
R42a 12V R4a 5V
R42b 5V R4b C11 5V
4 SENSE5 POR FG MCLK CNTL1 CNTL2 CNTL3 PWMSP PWMSOFT PWMH PWML C48 Digital Custom ASIC C2 10 6 8 44 45 46 47 1 13 14 48 2 CFSP CFSF
42 SENSE12
11 CDLY
17
5, 29 VDD VREF ADJ 7 R3a 3 U BRAKE 39 M39b C39 CBRAKE 40 C40 PVCC1 41 N 36 U 37 M39a 12V v VREG R3b
VCC
2003
C15 15
KA3120
V 34 U
CFVCM
VCMOFF
9 W 32 C38
V
W
GAINSEL 12 VCM-
Rsense
22
CCOMP 38 PCS 33
R33 R22 C27 19 VCM CRET2 27 18 VCM+ FILOUT 25 R18 R25 ERRIN 28 RRET GND ERROUT 30 SENSE PVCC2 21 20 24 R24
12V
D20 C20
SENSEOUT
23, 26, 31, 35
: option
C30 R30
40
MIC-99D001 January 1999
PRELIMINARY
HDD PRODUCTS
KA3120
COMPONENT VALUE
Part No. R18 R24 R22 R25 R30 Rsense R33 R4A R4B R42A R42B Value 15k 2.2k Option 15k 1k 1 0.25 Option Option Option Option Type 1/4W 1/4W 1/4W 1/4W 1/4W 1W 1W 1/4W 1/4W 1/4W 1/4W Part No. C2 C11 C15 C16 C20 C27 C30 C38 C40 C48 C39 Value 10n 47n 10n 1 224n 1 1.2n 150n 220n 10n Option Type Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Part No. Q1 M39a SSD2003 M39b D20 - - - - - - - RB4110 - - - - - - - Schottky Diode - - - - - - - 8SOP Value KSH29 Type D-PAK
MIC-99D001 January 1999
41
PRELIMINARY
KA3120
HDD PRODUCTS
PACKAGE DIMENSION
42
MIC-99D001 January 1999
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.
ACExTM CoolFETTM CROSSVOLTTM E2CMOSTM FACTTM FACT Quiet SeriesTM FAST(R) FASTrTM GTOTM HiSeCTM
DISCLAIMER
ISOPLANARTM MICROWIRETM POPTM PowerTrenchTM QSTM Quiet SeriesTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 TinyLogicTM
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.

▲Up To Search▲

Price & Availability of KA3120

	To Download KA3120 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .