FAN8621B

FAN8621B FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

• Hysteresis power on reset with delay function
• 5V , 12V supplies monitoring
• Thermal shut down(TSD)
• Programmable precision regulator usging minimal external component
• Three state control input to reduce number of PINs Spindle Motor(SPM)
• ASIC based start-up
• Internal back-EMF processing
• Internal sensorless commutation
• Internal SPM speed control with SFLL(Syncronized Frequency Lock Loop).
• Linear SPM current control
• Selectable Motor Speed (5400/7200 RPM)
• Soft commutation circuitry to reduce acoustic noise
• Adjustable brake delay time
• Maximum 2A start-up current capability
• Internal and external spindle brake
• Speed lock indicator output Voice Coil Motor (VCM)
• Intelligent retract (decreased bouncing)
• 1.2A internal VCM power driver
• Selectable transconductance
• 4V precision reference output
• Two PWM input (fine/coarse) for VCM set point

Description

The FAN8621B, is a Bipolar monolithic stand-alone IC, designed for 12V HDD applications.The internal power stage consists of vertical PNP and NPN TRs for both SPM and VCM, thus minimizing voltage drop, and increasing drive capability up to 2A for SPM and 1.2A for VCM. This device includes soft commutation drive to reduce audible noise and intelligent retract function for decreased bouncing. 48-QFPH-1414 Typical Applications

• Hard disk drive(HDD)

Ordering Information

Device Package Operating Temp. FAN8621B 48-QFPH-1414 0 ~ 70 °C FAN8621B 12V Spindle Motor and Voice Coil Motor Driver IC

B

Pin Number Pin Name IO Pin Function Description 1 VCNT A Speed controller output. Range 3.8V to 0.5V

2 CSOFT A Capacitor for soft commutation

3 ADJ A Adjust external regulator voltage (VREF)

4 SENSE5 A 5V power line sensing

5 VDD P 5V power line

6 FG O Frequency generation for spindle rotation speed. Typically 1.08KHz (5400RPM) 7 VREF P Regulator voltage output. This voltage is controlled by pin 3 voltage 8 CLK I System clock. Digital clock input as a time reference

9 HALFVCC P 1/2 VCC

10 POR O Power on reset. H : normal, L: power fail

11 CDLY A Define POR delay time

12 GAINSEL I Sense amplifier gain selection. H : High gain (8), L : Low gain (2)

13 PWMH I Coarse PWM input for VCM set point

14 PWML I Fine PWM input for VCM set point

15 CFVCM A Output of PWM inputs to voltage converter

16 VCMREF4V P 4V reference output for VCM

17 CRET A Define retract delay time.

18 VCC P 12V power line

19 FILOUT A Filtered output of PWM inputs. This voltage define VCM set point

20 SENSE A Non-inverting input of differential amplifier for VCM current

21 CRET2 A Power for retract when power down

22 PVCC P 12V power line for VCM

23 VCM- A Negative output terminal of VCM power amplifier

24 RRET A Adjust maximum retract current

25 SENSEOUT A Output of differential amplifier for VCM current sensing

26 PGND P Ground for VCM

27 VCM+ A positive output terminal of VCM power amplifier

28 ERRIN A Inverting input of VCM error amplifier

29 VDD P 5V power line

30 ERROUT A Output of VCM error amplifier

31 SUBGND P Ground for spindle motor

32 W A Spindle W phase output

Pin Definitions (Continued) Pin Number Pin Name IO Pin Function Description 33 PCS A Spindle current sensing.

34 V A Spindle V phase output

35 SUBGND P Ground for spindle

36 N A Spindle N phase output

37 U A Spindle U phase output

38 PVCC P 12V power line for spindle

39 CCOMP A Current controller output. This Voltage define spindle output current

40 BRAKE A Gating signal for external brake

41 CBRAKE A Charged back-EMF to supply brake power when power down

42 SENSE12 A 12V power line sensing

43 GND P Ground

44 CNTL1 I Control input for spindle . H: spindle enable, Z: Spindle bias enable, L: brake 45 CNTL2 I Start-up clock and soft commutation. H: Start-up clock , L : soft commutation. 46 CNTL3 I Control input for VCM. H: VCM enable, Z : VCM disable, L: retract 47 READY O Speed lock indicator when speed is within 0.7% speed error range. H : speed locked, L: unlocked 48 RPMSEL I Target spindle speed selection. L : 5400 rpm, H: 7200 rpm with 5MHz Clock

1.3V SPM output on start-up clock hard/soft Brake Triangle Wave Generator Speed Discriminator Speed Lock Indicator PWMs Decorder 2nd orderFilter VDD ispll Counter Timing Control VCMREF4V VCMREF4V VCC gain 2,8 gain error amp sense amp power amp VCM Gain Selection Intelligent Retract TSD VCMREF4V power amp VCM on/off Retract FG Speed Reference U V W Retract Retract U clock clock 24 1721 19 28 30 11 37 U V W N pre amp SPM bias enable ispll 25K 11K Real Speed VCC VDD Current Limiting VCM H-bridge Power Driver SPM Three Phase Power Driver 5 29 18 CNTL1 CNTL2 CNTL3 READY RPMSEL PWMH PWML GAINSEL VCMREF4V HALFVCC FG CLK PORCDLY VREF ADJ VDD VDD VCC BRAKE CBRAKE PVCC N U V W CCOMP PCS PVCC VCM+ SENSE VCM- PGND SENSEOUTERROUTERRINFILOUTCRETRRETCRET2 SUBGND SUBGND GND CFVCM VCNT CSOFT SENSE12 SENSE5 VCM+ SENSE

Absolute Maximum Ratings(Ta = 25°C) NOTE: 1. When mounted on 50mm × 50mm × 1mm PCB (Phenolic resin material) 2. Power dissipation is reduced 16mV / °C for using above Ta=25°C. 3. Do not exceed Pd and SOA(Safe Operation Area). Power Dissipation Curve Recommanded Operating Coditions (Ta = 25°C) Parameter Symbol Value Unit Supply voltage (signal) V DD 6.0 V Supply voltage (signal) V CC 15.0 V Supply voltage (power) PV CC 15.0 V Storage Temperature T STG −55 ~ 125 °C Power dissipation P D 3.0 note W Maximum Junction Temperature T J 150 °C Operating Ambient Temperature T AMB 0 ~ 70 °C Parameter Symbol Min. Typ. Max. Unit Supply voltage (signal) V DD 4.5 5.0 5.5 V Supply voltage (signal) Vcc 10.8 12.0 13.2 V Supply voltage (power) PV CC 10.8 12.0 13.2 V 0 25 50 75 100 125 Ambient temperature, Ta [°C] 150 175 1,000 2,000 3,000 Pd[mW]

Electrical Characteristics

(Ta=25°C, unless otherwise specified) Parameter Symbol Condition Min. Typ. Max. Unit POWER SUPPLIES SUPPLY CURRENT VDD Line supply current1 I DD1 CNTL1=L,CNTL2=CNTL3=Z (brake) 80- 100 120 mA VDD Line supply current2 I DD2 CNTL1= CNTL2 =CNTL3=Z (SPM bias enable) 25 35 45 mA VDD Line supply current3 I DD3 CNTL1=CNTL3=H,CNTL2=Z (SPM,VCM enable) 25 35 45 mA VDD Line supply current4 I DD4 CNTL1=CNTL2=Z,CNTL3= L (retract) 25 35 45 mA VCC Line supply current1 I CC1 CNTL1=L,CNTL2=CNTL3=Z (brake) 2 7 12 mA VCC Line supply current2 I CC2 CNTL1= CNTL2 =CNTL3=Z (SPM bias enable) 49 1 5 m A VCC Line supply current3 I CC3 CNTL1=CNTL3=H,CNTL2=Z (SPM,VCM enable) 10 20 60 mA VCC Line supply current4 I CC4 CNTL1=CNTL2=Z,CNTL3=L (retract) 12 19 25 mA SUPPLY MONITOR Threshold voltage1 for VCC V TH12A VCC=sweep,VDD= 5 V 9 . 0 59 . 4 09 . 7 5 V Threshold voltage2 for VCC V TH12B VCC=sweep,VDD= 5 V 8 . 7 59 . 1 09 . 4 5 V Hysteresis on VCCcomparator V HYS12 VCC=sweep,VDD=5V 0.15 0.3 0.45 V Threshold voltage1 for VDD V TH5A VCC=12V,VDD=sweep 3.45 3.90 4.15 V Threshold voltage2 for VDD V TH5B VCC=12V,VDD=sweep 3.30 3.75 4.00 V Hysteresis on V comparator V HYS5 VCC=12V,VDD=sweep 0.08 0.15 0.23 V POWER ON RESET GENERATOR Charging current for POR cap I CPOR −18.0 −14 −10 µA POR threshold voltage V THPOR 1.1 1.3 1.5 V Output high voltage V PORH VCC = 12V, VDD= 5V, POR output current is 1mA 4.5 - Vdd V Output low voltage V PORL VCC = 12V, VDD= 5V, POR output current is 1mA 0- 0 . 5 V CONTROL INPUTs(CNTL1,CNTL2,CNTL3) Control input low voltage V CTL CNTL1=CNTL2=CNTL3=sweep 0.8 1.3 1.7 V Control input high voltage V CTH CNTL1=CNTL2=CNTL3=sweep 1.85 2.3 2.75 V Control input low current I CTl CNTL1=CNTL2=CNTL3=sweep -290 -200 -110 µA Control input high current I CTH CNTL1=CNTL2=CNTL3=sweep 55 110 190 µA

Electrical Characteristics (Contnued) (Ta=25°C, unless otherwise specified) Parameter Symbol Condition Min. Typ. Max. Unit SPINDLE MOTOR (SPM) FG FREQUENCY GENERATOR FG frequency F FG CLK=5MHz,RPMSEL=L (5400 RPM) 0.97 1.08 1.18 KHz FG duty D FG FFG = 1.08KHz 45 50 50 % FG output high voltage V FGH FG output current is 1mA 4.5 - V DD V FG output low voltage V FGL FG output current is 1mA - - 0.5 V READY SIGNAL GENERATION READY high output V RDH CNTL1=H,within ±0.7% motor speed error, 4.5 - V DD V READY low output V RDL READY output current is 1mA - - 0.5 V SINDLE OUTPUT SATURATION VOLTAGE U Saturation voltage upper V SUU IU=1A 0.2 0.6 1.0 V VSaturation voltage upper V SVU IV=1A 0.2 0.6 1.0 V W Saturation voltage upper V SWU IW=1A 0.2 0.6 1.0 V U Saturation voltage lower V SUL IU=1A 0.2 0.4 0.8 V V Saturation voltage lower V SVL IV=1A 0.2 0.4 0.8 V W Saturation voltage lower V SWL IW=1A 0.2 0.4 0.8 V RPMSELECT INPUT RPMSEL threshold voltage V RPH -1 . 1 1 . 5 1 . 7 V RPMSEL input high current I RPHI -6 0 9 1 1 1 0 µA RPMSEL input low current I RPLO -- 5 0 5 µA SPEED CONTROLLER Speed controller high voltage VCNTH -3 . 5 3 . 8 4 . 2 V Speed controller low voltage V CNTL -- - 0 . 5 V High voltage of linear range V LIMITH - 3.15 3.5 3.85 V Low voltage of linear range V LIMITL - 1.15 1.5 1.85 V F/I converter charge current I SPLLC - -70 -50 -40 µA F/I converter discharge current I SPLLD -4 0 5 2 7 0 µA Transeconductance gain of SPM GMSPM RPCS=0.33Ω 0.6 0.8 1.0 - CURRENT LIMITTER Limit voltage of current amp V LIMIT1 RPCS = 0.33Ω -0 . 5 7- V Limit voltage of current amp V LIMIT2 RPCS = 0.33Ω -0- V Equivalent output resistance R CC -- 2 0 - K Ω EXTERNAL REGULATOR Regulator output voltage V REG VADJ(pin3) = 1.3V - 3.3 - V Regulator line regulation RLINE -- - 2 . 0 % Regulator load regulation R LOAD IO= 500mA - - 2.0 %

Electrical Characteristics (Contnued) (Ta=25°C, unless otherwise specified) Parameter Symbol Condition Min. Typ. Max. Unit SPINDLE MOTOR (Continued) BRAKE Cbrake output voltage V BC - 11 11.3 11.8 V Brake output high voltage V BH -1 1 − − V Brake output low voltage V BL -- - 0 . 5 V SOFT COMMUTATION Soft commutation high voltage V SOFTH - 3.1 - 3.7 V Soft commutation low voltage V SOFTL - 1.4 1.7 2.0 V Discharging current I SOFTC -3 0 4 5 6 0 µA Charging current I SOFTD - -60 -45 -30 µA DRIVE OUTPUTS (U,V,W) Total voltage Drop V DROPS IMOTOR = 1A - - 1.8 V Leakage current I LEAKS - −10 0 10 µA VOICE COIL MOTOR CIRCUIT(VCM) PWM INPUTS PWMH/PWML high input voltage V PWMH -2 . 8 - - V PWMH/PWML low input voltage V PWML -- - 2 . 2 V PWMH charge/discharge current IPWMH - 650 670 690 µA PWML charge/discharge current IPWML - 10 10.5 11 µA PWM current ratio I RATIO IPWMH/IPWML 63 64 65 Internal resister R FVCM -- 3 - k Ω VCN PWM FILTER Maximum phase shift D F Measure at 500Hz, CCFVCM = 1nF - - −2 deg Cut-off frequency F CO - - 100 - KHz Attenuation at 1MHz F ITER -- 7 0 - d B Filter output voltage1 V CVCM1 PWMH=PWML=0% 5.6 6.00 6.40 V Filter output voltage2 V CVCM2 PWMH=PWML=50% 3.8 4.0 4.2 V Filter output voltage3 V CVCM3 PWMH=PWML=100% 1.6 2 2.4 V VCM REFERENCE VCM reference voltage 4V V REF4 CNTL3 = 5V, VREF4V output current=1mA 3.8 4 4.2 V VCM reference voltage 1/2 VCC VREF6 HALFVCC output current =1µA 5.9 6.0 6.1 V

Electrical Characteristics (Contnued) (Ta=25°C, unless otherwise specified) Parameter Symbol Condition Min. Typ. Max. Unit SENSE AMPLIFIER Amp high output voltage V SOH - 10.8 - - V Amp low output voltage V SOL -- - 1 . 2 V Input offset voltage V OSS - −15 0 15 mV Short circuit current I SSC -1 0 - - m A Unity gain bandwidth B GS -- 2 - M H z Voltage gain 1 A VS1 GAINSEL : L - 18 - dB Voltage gain 2 A VS2 GAINSEL : H - 6 - dB ERROR AMPLIFIER Amp high output voltage V EOH - 10.8 - - V Amp low output voltage V EOL -- - 1 . 2 V Input offset voltage V OSE - −15 0 15 mV Open loop gain A VE -- 8 0 - d B Unity gain bandwidth B GE -- 2 - M H z Short circuit current I SSE -8 - - m A POWER AMPLIFIER Output high voltage V POH -1 1 . 5 - - V Output low voltage V POL -- - 0 . 5 V Input offset voltage V OSP - −15 0 15 mV Gain A PO - 21.2 22 23.8 dB Unity gain bandwidth B GP -- 2 - M H z Total voltage Drop V DROPV when VCM current is 0.7A - - 1.5 V Leakage current I LEAKV - −20 0 20 µA VCM AMP TOTAL VCM offset current V VCMOS PWMH=PWML=50% Duty −20 0 20 mA VCM transconductance low gain GM VH GAINSEL = H,sense resister is 1Ω 0.05 0.12 0.14 A/V VCM transconductance high gain GMVL GAINSEL = L,sense resister is 1Ω 0.35 0.45 0.55 A/V RETRACT FUNCTION Min operating voltage of CRET2 V CRET2 -2 . 0 - - V Cret charge current I CRET - -70 -85 -100 µA Max. retract sink current I RCT - - 125 - mA Retract reference voltage V RET - 0.75 0.9 1.05 V Retract current limit resister R IRET -- 3 - K Ω Leakage current of output TR I LRET - −10 0 10 µA Sink saturation voltage V RTSAT -- 0 . 4 0 . 7 V THERMAL SHUT DOWN Operating temperature T TSD - 135 150 165 °C Thermal hystereis T HYS -2 0 3 0 4 0 °C

Figure 1. Overall Interfacing of the FAN8621B Table 1. Control PIN function

1. SPM bias + SPM Output Driver enable
2. Makes SPM Open Loop (Start-up) Commutation Signal
3. Test Only when READY is low

in steady state to reduce acoustic noise. tion mode. Also internal commutation logic starts sensorless commutation. Figure 2. Typical Control Sequence of the FAN8621B (ZCP) of unexcited phase back-EMF. The output frequency of comparator multiplied by 3 represents motor speed FG ( pin6). Table 2. RPM selection

PNP TR of spindle output driver. Overall concept of SPM speed control is shown Figure3. Figure 3. Speed Control of SPM motor reduce acoustic noise and voltage spark which is generated on the motor coil at the commutation. Where Rmetal is internal metal resistance(typically 50mΩ). If R33 is 150mΩ, the maximum spindle current is 2A.

Figure 6. Current Control of VCM

capacitor connected CRET (pin 17). The voltage on CRET2 (pin21) charged by spindle back-EMF serves as retract power. Figure 7. Retract Function Block adding external resistor on SENSE5 (pin4), SENSE12 (42). ing of the CDLY (pin11) capacitor with internal current source.

300 Iret

A TSD circuit is included to protect the chip from damaging during momentary shorts that might occur during prototyping and troubleshooting. The trip temperature is set to 150°C with 30°C hysteresis. A thermal fault starts retract and braking operation and also makes POR pin low.

Typical Application Circuits Power Management Three State Input Control Commutation Sequencing Spindle Control External Brake Back-EMF Processing Zero Cross Detector Bandgap Reference Bias FG Generator 1.3V SPM output on start-up clock hard/soft Brake Triangle Wave Generator Speed Discriminator Speed Lock Indicator PWMs Decorder 2nd orderFilter VDD ispll Counter Timing Control VCMREF4V VCMREF4V VCC gain 2,8 gain error amp sense amp power amp VCM Gain Selection Intelligent Retract TSD VCMREF4V power amp VCM on/off Retract FG Speed Reference U V W Retract Retract U clock clock 24 1721 19 28 30 11 37 U V W N pre amp SPM bias enable ispll 25K 11K Real Speed VCC VDD Current Limiting VCM H-bridge Power Driver SPM Three Phase Power Driver 5 29 18 C1a C15 C30R19 R25 R28 C1b R24 C17 R33 C39 C41 V W C40 R3a R3b C11 12V 5V 12V CNTL1 CNTL2 CNTL3 READY RPMSEL PWMH PWML GAINSEL VCMREF4V 12V FG CLK VCM SPM PORCDLY VREF ADJ VDD VDD VCC BRAKE CBRAKE PVCC N U V W CCOMP PCS PVCC VCM+ SENSE VCM- R20 PGND SENSEOUTERROUTERRINFILOUTCRETRRETCRET2 SUBGND SUBGND GND CFVCM VCNT CSOFT SENSE12 SENSE5 VCM+ SENSE M40a M40b HALFVCC12.7K 12V 12V R27 C27D20 D27 12.7K D21 C21

Part NO. Value Type R1 280K 1/8W R3A 15K 1/8W R3B 10K 1/8W R19 6K 1/8W R20 1 1/2W R24 2.2K 1/8W R25 4K 1/8W R27 30 1/4W R28 2.2K 1/4W R33 0.33 1W C1A 1 µ ELECTROLYTIC, 6V C1B 0.22 µ CERAMIC, 6V C2 27n CERAMIC, 6V C11 0.047 µ CERAMIC, 16V C15 0.68n CERAMIC, 10V C17 1 µ ELECTROLYTIC, 16V C21 2.2 µ ELECTROLYTIC,16V C30 33n CERAMIC,16V C39 0.1 µ CERAMIC,16V C40 0.47 µ ELECTROLYTIC,16V C41 2.2 µ ELECTROLYTIC,16V Q7 KSH29 D-PACK M40A SSD2003 8SOP M40B SSD2003 8SOP D5 RB4110 SOT23 D20 RB4110 SOT23 D21 RB4110 SOT23 D27 RB4110 SOT23

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