FAN8732CG FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
- Built-in thermal shutdown circuit (TSD) Built-in power save circuit 4 Independent voltage sources Corresponds to 3.3V or 5V DSP Spindle Output PWM mode control BTL(Sled 2-channels) Output PWM mode control BTL(Other 3-channels) Output LINEAR mode control
Description
The FAN8732G/BG/CG is a monolithic IC suitable for a PWM 3-phase BLDC spindle motor driver, 2-CH PWM motor drivers for sled motor and 3-CH linear drivers which drive the focus actuator, tracking actuator and loading motor of the optical media applications. 42-SSOP-EP Typical Applications Compact disk ROM (CD-ROM) Compact disk RW (CD-RW) Digital video disk ROM (DVD-ROM) Digital video disk RAM (DVD-RAM) Digital video disk Player (DVDP) Other compact disk media
Ordering Information
X:Tape & Reel type FAN8732G:FG1X FAN8732BG:FG3X FAN8732CG:FG3X,Pull down resistor at SB pin Device Package Operating Temp. FAN8732G 42-SSOP-EP −20°C ~ +75°C FAN8732GX 42-SSOP-EP −20°C ~ +75°C FAN8732BG 42-SSOP-EP −20°C ~ +75°C FAN8732BGX 42-SSOP-EP −20°C ~ +75°C FAN8732CG 42-SSOP-EP −20°C ~ +75°C FAN8732CGX 42-SSOP-EP −20°C ~ +75°C FAN8732G/FAN8732BG/FAN8732CG Spindle motor and 5-C H actua tor driv er [Spindle(PWM), Sled 2-C H(PWM) 3-CH (Linear)]
FAN8732G/FAN8732BG/FAN8732CG Pin Assignments FAN8732G/ IN4 IN5 PVCC3 CS2 DO5+ DO5- PGND3 CS1 DO4+ DO4- PGND2 W OSC MUTE IN3 PVCC1 SB DO3- DO3+ DO1- DO1+ PGND1 DO2+ DO2- V U CS3 HW- HW+ HV- HV+ HU- HU+ SVCC SGND IN2 IN1 SPIN VREF FG VH PVCC2 30FAN8732BG/ FAN8732CG
FAN8732G/FAN8732BG/FAN8732CG Pin Definitions Pin Number Pin Name I/O Pin Function Description
1 IN4 I CH4 input (typically sled1 input)
2 IN5 I CH5 input (typically sled2 input)
3 PVCC3 - Power supply for CH4 and CH5
4 CS2 - Current sense for CH5
5 DO5 + O CH5 + drive output (typically sled2 output +)
6 DO5 - O CH5 - drive output (typically sled2 output -)
7 PGND3 - Power ground 3
8 CS1 - Current sense for CH4
9 DO4 + O CH4 + drive output (typically sled1 output +)
10 DO4 - O CH4 - drive output (typically sled1 output -)
11 PGND2 - Power ground 2
12 W O 3-phase output W for spindle
13 V O 3-phase output V for spindle
14 U O 3-phase output U for spindle
15 CS3 - Current sense for spindle driver
16 HW - I Hall W(-) input
17 HW + I Hall W(+) input
18 HV - I Hall V(-) input
19 HV + I Hall V(+) input
20 HU - I Hall U(-) input
21 HU + I Hall U(+) input
22 PVCC2 - Power supply for spindle driver
23 VH I Hall bias
24 FG O Frequency generator
(FAN8732G:FG1X, FAN8732BG:FG3X)
25 VREF I Reference voltage input
26 SPIN I Spindle torque control
27 IN1 I Channel 1 input (typically focus input)
28 IN2 I Channel 2 input (typically tracking input)
29 SGND - Signal ground
30 DO2 - O CH2 - drive output (typically tracking output +)
31 DO2 + O CH2 + drive output (typically tracking output -)
32 SVCC - Power supply for signal block and CH1, CH2
33 PGND1 - Power ground 1
FAN8732G/FAN8732BG/FAN8732CG Pin Definitions (Continued) Pin Number Pin Name I/O Pin Function Description
34 DO1 + O CH1 + drive output ((typically focus output +)
35 DO1 - O CH1 - drive output (typically focus output -)
36 DO3 + O CH3 + drive output (typically loading output +)
37 DO3 - O CH3 - drive output (typically loading output -)
38 SB I Short Brake mode selection
39 PVCC1 - Power supply for CH3
40 IN3 I Channel 3 input (typically loading input)
41 MUTE I All channel mute
42 OSC I PWM carrier frequency set
FAN8732G/FAN8732BG/FAN8732CG Internal Block Diagram PVCC2 PGND1 PVCC1 IN4 IN5 PVCC3 DO5+ DO5- PGND3 CS1 DO4+ DO4- V U CS3 HW- HW+ HV- HV+ HU- HU+ CS2 PGND2 W VH FG VREF SPIN IN1 IN2 SGND SVCC DO2- DO2+ DO1+ DO1- DO3+ DO3- SB IN3 MUTE OSC Bootstrap Regulator Hall bias TSD LPF H bridge PWM Control LPF OSC OSC OSC OSC Focus, Tracking, Loading block Spindle power PVCC3 Spindlepower H bridge Oscillator Hall Amp All mute Short Brake Mode IN3 PWM Control Commutator & Power driver LPF Reverse detector Frequency generator PWM Control IOMAX R S QDrive Logic Gm
FAN8732G/FAN8732BG/FAN8732CG Equivalent Circuits Sled & Spindle Input Actuator & Loading Input Hall Input Current Sense Input Hall Bias Input FG Output Vref Input Drive Output 2KΩ 1 2 26 SVCC 2KΩ 27 28 40 SVCC 2KΩ SVCC 16 17 18 19 20 21 4 8 15 SVCC SVCC 2KΩ SVCC 2KΩ 2KΩ 5 6 12 14 30 31 34 35 36 37
FAN8732G/FAN8732BG/FAN8732CG Equivalent Circuits (Continued) Mute/SB Input(FAN8732G/BG) Oscillation Input SB Input(FAN8732CG) 8KΩ 30KΩ 12KΩ 2KΩ SVCC 2KΩ 2KΩ 8KΩ 30KΩ 12KΩ 10KΩ
FAN8732G/FAN8732BG/FAN8732CG Absolute Maximum Ratings (Ta = 25°C) Note: 1. Case 1: Single layer PCB with 1 signal plane only. PCB size is 76mm × 114mm × 1.6mm. 2. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes. PCB size is 76mm × 114mm × 1.6mm. Cu planes size for power and ground is 74mm × 62mm × 0.035mm. 3. These are experimental datum. 4. Power dissipation reduce rate of the case 1: -15.2mW/ °C(Ta≥25°C) 5. Power dissipation reduce rate of the case 2: -26.4mW/°C(Ta≥25°C) 6. Should not exceed PD and SOA (Safe Operating Area) Power Dissipation Curve Parameter Symbol Value Unit Supply Voltage (Signal block & CH1,2) SV CCmax 7V Supply Voltage (Power for CH3) PV CC1max 15 V Supply Voltage (Spindle driver) PV CC2max 15 V Supply Voltage (Power for CH4 & 5) PV CC3max 15 V Power dissipation P D 1.9 / 3.3NOTE W Operating Temperature Range T OPR -20 ~ +75 °C Storage temperature Range T STG -40 ~ +150 °C Maximum Output Current (Spindle) I Omax1 1.5 A Maximum Output Current (Focus, Tracking, Loading) IOmax2 1.0 A Maximum Output Current (Sled) I Omax3 0.5 A Case 1 Case 2 Remark Pd is measured base on the JE- DEC/STD(JESD 51-2) Pd=1.9W Pd=3.3W PCB(glass-epoxy) Power plane(Cu) GND plane(Cu) 1751501251005025 1,000 2,000 3,000 Pd [mW] Ambient Temperature, Ta [°C]0 75 case2 case1 SOA
FAN8732G/FAN8732BG/FAN8732CG Recommended Operating Conditions (Ta = 25°C) Parameter Symbol Min. Typ. Max. Unit Operating Supply Voltage (Signal block & CH1,2) SVCC 4.5 5 7 V Operating Supply Voltage (Power for CH3) PV CC1 4.5 12 13.2 V Operating Supply Voltage (Spindle driver) PV CC2 6 12 13.2 V Operating Supply Voltage (Power for CH4,5) PV CC3 4.5 12 13.2 V Output current(Spindle) I O1 -0 . 5 1 . 0A Output current(Focus, Tracking, Loading) I O2 -0 . 5 0 . 8A Output current(Sled) I O3 -0 . 2 5 0 . 4 A PWM carrier frequency F osc 30 - 120 KHz
FAN8732G/FAN8732BG/FAN8732CG Electrical Characteristics (Ta = 25°C) (Ta=25°C, SVCC =PV CC1 =5V, PVCC2 =PV CC3 =12V unless otherwise noted) Parameter Symbol Condition Min. Typ. Max. Unit COMMON PART Quiescent Circuit Current I CC −− 50 70 mA Mute On Current I MUTE MUTE=0V − 03 0 µA Mute On Voltage V MON MUTE=variation −− 0.8 V Mute Off Voltage V MOFF MUTE=variation 2.5 −− V Mute Input Current IMUTEIN MUTE=5V −− 500 µA PWM Carrier Frequency F OSC C OSC =330pF − 65 − KHz REF input voltage range V REFIN − 1.0 − 3.3 V REF input current range I REFIN VREF =1.65V -10 − +10 µV SB Low Voltage V SBL SB=variation −− 0.8 V SB High Voltage V SBH SB=variation 2.5 −− V SB Input Current1 I SB1 SB=5V(FAN8732G/BG) −− 500 µA SB Input Current2 I SB2 SB=5V(FAN8732CG) −− 1.2 mA SPINDLE DRIVE PART Maximum Output Voltage1 V OM1 IO =0.5A 10.6 11.1 − V Control Voltage Deadzone11 V DEAD11 SPIN<VREF -80 -40 0 mA Control Voltage Deadzone12 V DEAD12 SPIN>VREF 0 40 80 mA Control Voltage Input Range1 V IN1 − 0 − 5V Voltage Gain1 G VO1 G IO1=G VO1 /Rcs[A/V] 0.85 1.0 1.15 V/V Control Voltage Limit 1F V LIMIT1F ILIMIT1F=V LIMIT1F/Rcs[A] 0.4 0.5 0.6 V Control Voltage Limit 1R V LIMIT1R ILIMIT1R=V LIMIT1R/Rcs[A] 0.22 0.28 0.34 V Hall Amp Common Mode Input Range VH COM − 1.3 − 3.7 V Hall Bias Output Voltage V VH IVH =10mA 0.6 0.85 1.2 V VH pin Sink Current I VH MUTE-5V −− 30 mA CH4/CH5 DRIVE PART (TYPICALLY SLED DRIVER) Maximum Output Voltage21 V OM21 IO=0.5A, PVCC3 =5V 3.4 3.8 − V Maximum Output Voltage22 V OM22 IO=0.5A, PVCC3 =12V 10.3 10.8 − V Control Voltage Deadzone21 V DEAD21 IN4,5<VREF -80 -40 0 mV Control Voltage Deadzone22 V DEAD22 IN4,5>VREF 0 40 80 mV Control Voltage Input Range2 V IN2 − 0 − 5V Voltage Gain2 G VO2 G IO2=G VO2 /Rcs[A/V] 0.85 1.0 1.15 V/V Control Voltage Limit 2 V LIMIT2 ILIMIT2=V LIMIT2/Rcs[A] 0.43 0.5 0.58 V Output Leak Current I LEAK MUTE=5V -100 − 100 µA
FAN8732G/FAN8732BG/FAN8732CG Electrical Characteristics (Ta = 25°C) (Continued) (Ta=25°C, SVCC =PV CC1 =5V, PVCC2 =PV CC3 =12V unless otherwise noted) Parameter Symbol Condition Min. Typ. Max. Unit CH1,CH2 DRIVE PART (TYPICALLY ACTUATOR DRIVER) Maximum Output Voltage 31 V OM31 IO =0.5A, PVCC2 =12V 3.8 4.2 − V Control Voltage Input Range3 V IN3 − 0 − 5V Closed Loop Voltage Gain G VO3 − 20.2 21.6 22.8 dB Output Offset Voltage V OO1 VREF=IN1=IN2=1.65V -45 − 45 mV CH3 DRIVE PART (TYPICALLY LOADING DRIVER) Maximum Output Voltage 41 V OM41 IO =0.5A, PVCC1 =5V, PV CC2 =12V 3.95 4.2 − V Maximum Output Voltage 42 V OM42 IO =0.5A, PVCC1 =PV CC2 =12V 6.2 6.7 − V Control Voltage Input Range4 V IN4 − 0 − 5V Closed Loop Voltage Gain G VO4 − 16.7 18.1 19.3 dB Output Offset Voltage V OO2 VREF=IN3=1.65V -50 − 50 mV
FAN8732G/FAN8732BG/FAN8732CG
Application Information
- Torque Control & Output Current Control Of 3-phase Bldc Motor 1) By amplifying the voltage difference between VREF and SPIN from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP ) which is input current command. 2) The output current (IO ) is converted into the voltage (VCS ) through the sense resistor (RCS ) and compared with the VAMP . 3) The clock generator has the RS latch set periodically, this makes output driver on state and when the VCS and the VAMP is equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage VCS equals to the VAMP . 5) Commutating sequence is selected by hall sensor inputs, and the minimum hall input voltage is 60mV . 6) The gain and limit current are calculated as below table.(Gvo=1[V/V]) 7) The range of the input voltage is as shown below when Rcs=0.5Ω, REXT1 =0 and REXT2 =inf. Forward limit current Reverse limit current Input/Output gain[A/V] Remark is gain scaler + - Torque AMP VREF SPIN Commutator Driver M RcsVcs IoVAMP LPF R S Q Clock Generator Hall sensor R EXT1 R EXT2 PVCC2 Inside IC IOMAX 0.5 R EXT2 G VO R CS R EXT2 Forward DeadDead Reverse Current [A]
0 SPIN-VREF
The input range of SPIN is 0 V ~ 5 V 40mV-40mV zone+zone-0.56 G IO=G VO / RCS Rotation SB=H SPIN > VREF Forward rotation SPIN < VREF Reverse brake SB=L, open − Short brake
FAN8732G/FAN8732BG/FAN8732CG 2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor) 1) By amplifying the voltage difference between VREF and IN4(or IN5) from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP ) which is input current command. 2) The output current (IO ) is converted into the voltage (VCS ) through the sense resistor (RCS ) and compared with the VAMP . 3) The clock generator has the RS latch set periodically, this makes output driver on state and when the VCS and the VAMP is equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage VCS equals to the VAMP . 5) To avoid output upper and lower transistor’s short through, switch trick is needed. Turn on delay time is 1usec, turn off delay time is 2usec and the phase delay time, when the current direction is changed, is 3usec. 6) The gain and limit current are calculated as below table.(Gvo=1[V/V]) 8) The range of the torque voltage is as shown below when Rcs=0.5Ω, REXT1 =0 and REXT2 =inf. Torque limit current Input/Output gain[A/V] Remark is gain scaler + - Torque AMP VREF IN4(or IN5) Driver M RcsVcs Io PVCC3 VAMP LPF R S Q Clock Generator R EXT1 R EXT2 Drive Logic Inside IC IOMAX 0.5 R EXT2 G VO R CS R EXT2 Forward DeadDead Reverse Current [A]
0 IN4/IN5-VREF
G IO=G VO / RCS
FAN8732G/FAN8732BG/FAN8732CG 3. CH1/CH2/CH3 Drive Part 1) The reference voltage, VREF, is given externally through pin 25. 2) The power amp circuit produces the differential output voltages and drives the two output power amplifier circuits. 3) The CH1/CH2 gain of DO- drive part of the power amp block is 6R/R=6 times(and the gain of CH3 is 4R/R=4times). The DO+ drive part of the power amp block is just inverting circuit of DO- drive part so the total gain of power amp block is 12 times that is 21.58dB(in case of CH3, gain is 8 times that is 18.06dB). 4) Power reference voltage, which is the mid-point of the drive output, is set to the half of the supply voltage. 5) When the total gain is too high, the external resistors(R EXT1 & REXT2 )can be used to make the gain proper. Power amp gain Input/Output gain[V/V] Remark 12(21.58dB) is gain scaler + − + − M 25 27 28 Vref Power amp +−R R SVCC DO − 35 3034 31 DO + R R R R 6R IN1 IN2 R EXT1 R EXT2 M Inside IC (4R) (4R) 36 37 IN3 Power reference R EXT2 R EXT2
FAN8732G/FAN8732BG/FAN8732CG 4. Power Save & Channel Selection MUTE/SB logic tables are as below. 5. SB(Short Brake Mode Selection) When SB pin enabled(low), the brake mechanism of 3-phase spindle driver is changed to short brake. When short brake is enabled all lower output transistors are turned on and all upper output transistors are turned off, so the cur- rent due to the motor back EMF(electro motive force) is freewheeled through lower transistors and lower freewheeling diodes. It is general that the short brake is safer than the reverse brake in high speed applications. But it is not true in all cases because the current in the short brake is depend on the amount of the motor back EMF. So in high speed applications we suggest an optimal brake which is our patent. Please contact sales persons or offices if you need more information about the optimal brake. 6. TSD(Thermal Shut Down) When the chip temperature rises up to about 160oC(degree), all output drivers are shut down. When the chip temperature falls off to about 130oC, then the drivers recover normal operation. TSD has the temperature hysteresis of about 30oC. Logic Input Drive Change Mute(pin41) SB(pin38) CH1 CH2 CH3 CH4 CH5 spindle L L off off off off off off L H off off on off off off HL on on off on on on HH Vcc OFF ON 20KΩ 1KΩ MOTOR OFF ON 12 13 SHORT BRAKE OPERATING SCHEME
FAN8732G/FAN8732BG/FAN8732CG 7. FG OUTPUT FAN8732G generates FG1X, meanwhile FAN8732BG/CG generates FG3X 8. PWM Carrier Frequency PWM carrier frequency is made from charging and discharging a capacitor which should be connected to osc(#42) pin. You can get typical pwm carrier frequency from below table. 9. Hall Sensor Connection capacitor[pF] 820 680 330 220 180 150 120 Carrier frequency[KHz] 28 32 65 90 110 143 179 Vcc VH HALL 1 HALL 2 HALL 3 23 VH Vcc HALL 1 HALL 2 HALL 3
FAN8732G/FAN8732BG/FAN8732CG 10. Spindle Part Input-output Timing Chart The waveforms are different in accordance with motor types. A2 output voltage H1 + H2 + H3 + A1 output current (H1 -)+(H2 +) A3 output current (H3 -)+(H1 +) A3 output voltage A2 output current (H2 -)+(H3 +) A1 output voltage
FAN8732G/FAN8732BG/FAN8732CG Typical Application Circuits W PGND2 DO4+ DO4- CS1 DO5+ CS2 PVCC3 IN4 IN5 DO5- PGND3 FAN8732G/FAN8732BG/ FAN8732CG TRACKING ACTUATOR FOCUS ACTUATOR HALL-W HALL-V HALL-U HU- HW+ HW- CS3 V U HV- HV+ HU+ DO2- DO2+ DO1+ PGND1 DO1- SB PVCC1 IN3 OSC MUTE DO3- DO3+ VH SPIN IN1 IN2 SVCC SGND VREF FG PVCC2 SLED (stepping) MOTOR M M LOADING MOTOR SVCC Focus Spindle Vref (typically 1.65V) 3Phase BLDC motor Tracking Short Brkae Selection PVCC2 PVCC1 Mute Selection Loading Vref Sled1 Vref Sled2 Vref PVCC3
FAN8732G/FAN8732BG/FAN8732CG
FAN8732G/FAN8732BG/FAN8732CG 8/18/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation 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 THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com DISCLAIMER 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.