LV8220FN

Ordering number : EN7811A LV8220FN Overview Bi-CMOS IC CD/MD System Motor Driver The LV8220FN is a system motor driver IC that implements all the motor driver circuits needed for CD and MD products. Since the LV8220FN provides a three-phase PWM spindle driver, a three-phase sled driver, and focus and tracking drivers (as two PWM H-bridge driver channels), it can contribute to further miniaturization, thinner from factors, and lower power in end products. The adoption of the direct PWM sensorless drive method for the spindle driver and the sled driver makes it possible to implement high efficiency motor drive with few external parts. Features • Direct PWM drive (low side control) • Three-phase full-wave sensorless motor driver (spindle and sled blocks) • Soft switching drive (spindle block) • Reverse torque braking • MOS output transistors • Standby mode power saving function • FG output Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Power supply voltage 1 Power supply voltage 2 Output block power supply voltage Output current Power dissipation 1 Power dissipation 2 Operating temperature Storage temperature Symbol VCC max VG max VS max IO max Pd max1 Pd max2 Topr Tstg Independent IC Mounted on a specified board Conditions Ratings 6.0 9.6 6.0 0.8 0.35 1.1 -20 to +85 -55 to +150 Unit V V V A W W °C °C * Mounted on a specified board: 50mm×50mm×0.8mm, glass epoxy Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 50907 TI IM B8-6675 No.7811-1/15 LV8220FN Recommended Operating Conditions at Ta = 25°C Parameter Power supply voltage 1 Power supply voltage 2 Output block power supply voltage Symbol VCC VG VS VS ≤ VG-3.5(V) Conditions Ratings 1.9 to 4.0 5.0 to 9.0 0 to 5.5 Unit V V V Electrical Characteristics at Ta = 25°C, VCC = 2.3V Parameter Power supply current 1 Power supply current 2 Power supply current 3 Power supply current 4 Power supply current 5 CLK Pin High level input voltage range Low level input voltage range VG2 Pin Output voltage Actuator block (focus and tracking) Actuator input pin High level input voltage range Low level input voltage range Output block ON resistance SOURCE1 SOURCE2 SINK SOURCE+SINK Output transmission delay time (H-bridge) Minimum input pulse width Sled block Output block ON resistance SOURCE1 SOURCE2 SINK SOURCE+SINK Decoder Input Pin (S1 to S3) High level input voltage range Low level input voltage range Position detection comparator Input offset voltage Common-mode input voltage range High level output voltage Low level output voltage VCO Pin VCO high level voltage VCO low level voltage VSLVCOH VSLVCOL 0.85 0.40 1.05 0.60 1.25 0.80 V V VSLOFS VSLCM VSLFGH VSLFGL IO=-0.5mA IO=0.5mA -5 0 VCC-0.5 +5 VCC VCC 0.5 mV V V V VSLIH VSLIL VCC-0.5 0 VCC 0.5 V V Ron(H1) Ron(H2) Ron(L) Ron(H+L) IO=0.5A, VS=2.3V, VG=6.3V forward TR IO=0.5A, VS=2.3V, VG=6.3V reverse TR IO=0.5A, VS=2.3V, VG=6.3V IO=0.5A, sum of upper and lower outputs 0.4 0.4 0.4 0.8 0.6 0.6 0.6 1.2 Ω Ω Ω Ω Ron(H1) Ron(H2) Ron(L) Ron(H+L) TRISE TFALL tmin IO=0.5A, VS=2.3V, VG=6.3V forward TR IO=0.5A, VS=2.3V, VG=6.3V reverse TR IO=0.5A, VS=2.3V, VG=6.3V IO=0.5A, sum of upper and lower outputs * Design target * Design target Ch1, ch2 output pulse width is 2/3 tmin or more * Design target 200 0.4 0.4 0.4 0.8 0.1 0.1 0.6 0.6 0.6 1.2 Ω Ω Ω Ω µs µs ns VAIH VAIL VCC-0.5 0 VCC 0.5 V V VREG VG1=6.3(V) 3.5 4.5 V VCLKH VCLKL VCC-0.5 0 VCC 0.5 V V Symbol ICC1 ICC2 ICC3 IG1 IG2 Conditions min S/S pin H, SEL1 pin H S/S pin H, SEL1 pin L S/S pin L (standby mode) S/S pin H, SEL1 pin L S/S pin L (standby mode) 80 Ratings typ 1.3 1.0 max 2.0 1.5 20 150 20 mA mA µA µA µA unit * Design target value and no measurement is performed. Continued on next page. No.7811-2/15 LV8220FN Continued from precceding page. Parameter PWM Pin High level input voltage range Low level input voltage range PWM input frequency SEL Pin High level input voltage range Low level input voltage range Spindle motor driver block Output block ON resistance SOURCE1 SOURCE2 SINK SOURCE+SINK Position detection comparator Input offset voltage VCO Pin VCO high level voltage VCO low level voltage S/S Pin High level input voltage range Low level input voltage range BREAK Pin High level input voltage range Low level input voltage range PWM Pin High level input voltage range Low level input voltage range PWM input frequency FG Output Pin High level output voltage Low level output voltage VSPFGH VSPFGL IO=-0.5mA IO=0.5mA VCC-0.5 VCC 0.5 V V VSPPWMH VSPPWML fSPIN VCC-0.5 0 VCC 0.5 190 V V kHz VSPBRH VSPBRL Brake OFF Brake ON VCC-0.5 0 VCC 0.5 V V VSSH VSSL Start Stop VCC-0.5 0 VCC 0.5 V V VSPVCOH VSPVCOL 0.85 0.40 1.05 0.60 1.25 0.80 V V VSOFS -5 +5 mV Ron(H1) Ron(H2) Ron(L) Ron(H+L) IO=0.5A, VS=2.3V, VG=6.3V forward TR IO=0.5A, VS=2.3V, VG=6.3V reverse TR IO=0.5A, VS=2.3V, VG=6.3V IO=0.5A, sum of upper and lower outputs 0.4 0.4 0.4 0.8 0.6 0.6 0.6 1.2 Ω Ω Ω Ω VSLH VSLL VCC-0.5 0 VCC 0.5 V V VSLPWMH VSLPWML fSLIN VCC-0.5 0 VCC 0.5 190 V V kHz Symbol Conditions min Ratings typ max unit Package Dimensions unit : mm (typ) 3272 Top View Bottom View 0.2 7.2 7.0 36 37 25 24 0.3 5.0 0.4 7.0 7.2 0.3 48 1 (0.75) 0.5 Side View 13 12 0.2 4 - Do Not Connect (0.8) 0.85MAX SANYO : VQFN48(7X7) 5.0 0.4 No.7811-3/15 LV8220FN 1.5 Pd max - Ta Mounted on a specified board: 50mm×50mm×0.8mm, Mounted on a thermal resistance glass epoxy evaluation board 1.1 Allowable power dissipation, Pd max - W 1.0 0.57 0.5 Independent IC 0.35 0.18 0 -20 0 20 40 60 80 100 ILV00177 Ambient temperature, Ta - °C Logic I/O Truth Tables Focus and Tracking Blocks S/S H H H H L IN1, 2F L H L H × IN1, 2R L L H H × OUT1, 2F L H L L Z OUT1, 2R L L H L Z Sled Motor Stepping block SEL L L L L L L L L H × S/S H H H H H H H H H L S1 L H L H L H L H × × S2 L L H H L L H H × × S3 L L L L H H H H × × SUO H H Z L L Z Z Z SVO L Z H H Z L Z Z SWO Z L L Z H H Z Z Commutation output determined by sensorless logic Z Z Z Z: open BRK Pin S2 H L OUT Acceleration Deceleration SPBR H L OUT Acceleration Deceleration PWM Pin SLPWM H L SINKOUT ON OFF SPPWM H L SINKOUT ON OFF S/S Pin S/S H L H-bridge Operating Stopped Sled Operating Stopped Spindle Operating Stopped Remarks Operating mode Power saving mode No.7811-4/15 LV8220FN Pin Assignment 36 SPGND 37 SPFG 38 UOUT 39 SPCOM 40 VOUT 41 WOUT 42 SPPWM 43 VS2 44 OUT2F 45 OUT2R 46 PGND2 47 SPBR SPMAX 48 S/S SPPD 1 35 SPVS 34 SPCIN 33 SPFIL 32 SPVCO 31 VG2 30 GND 29 SLMAX 28 SLVCO 27 SLPD 26 SLVS 25 SLGND SLFG 24 SUO 23 SLCOM 22 SVO 21 SWO 20 SLPWM 19 VS1 18 OUT1F 17 OUT1R 16 PGND1 15 IN1R 14 IN1F 13 SEL 12 Top view LV8220FN IN2R 2 3 4 5 6 7 8 9 10 11 Pin Functions Pin No. 13,14 3,4 7 Pin Name IN1F/R IN2F/R CLK Logic system reference clock input. Provide a frequence that is 32 times that of the PWM frequency. 12 SEL1 Three-phase sled mode switching input. When high, the block operates in sensorless drive mode, and when low, the block operates in stepping drive mode. 19 42 47 48 SLPWM SPPWM SPBR S/S Sled drive block PWM signal input. When high, the control output transistor (SINK) is turned on. Spindle drive block PWM signal input. When high, the control output transistor (SINK) is turned on. Spindle drive block brake input. When low, reverse torque braking is applied. Start/stop input. When high, all of the spindle, sled, and actuator blocks operate. When low, the IC goes to the standby state (power saving mode). Pin Description Actuator H-bridge logic input. Equivalent Circuit VCC GND IN2F VCC VG1 CLK S1 S2 S3 10kΩ 100kΩ Continued on next page. No.7811-5/15 LV8220FN Continued from preceding page. Pin No. 8 Pin Name S1 Pin Description Decoder input in sled stepping motor mode. Functions as the forward/reverse switching input in sensorless mode (SEL1: high, SEL2: low) and in H-bridge mode (SEL2 high). 9 S2 Decoder input in sled stepping motor mode. Functions as the BRK (braking) switching input in sensorless mode (SEL1: high, SEL2: low). (A high-level input applies braking.) 10 S3 Decoder input in sled stepping motor mode. Equivalent Circuit VCC 100kΩ 10kΩ 5 VG1 Predriver power supply. Used as the power supply for the source side predrivers, the internal regulator (VG2), and the sensorless driver position detection comparator. Insert a capacitor between this pin and ground. 6 18 VCC VS1 Small- signal system power supply. Insert a capacitor between this pin and ground. H-bridge circuit 1 power supply. Insert a capacitor between this pin and PGND1 (pin 15). 18 16,17 OUT1F/R H-bridge circuit 1 output. 16 17 15 PGND1 H-bridge circuit 1 ground. 15 26 SLVS Sled drive block power supply. Insert a capacitor between this pin and SLGND (pin 25). 26 23 23 21 20 25 SUO SVO SWO SLGND Sled drive block ground. Sled driver output. Connect this pin to the sled motor coil. 21 20 25 22 SLCOM Three-phase sled block position detection comparator common side input. Connect this pin to the sled motor center point connection. VG 6kΩ 39 SPCOM Spindle block position detection comparator common side input. Connect this pin to the spindle motor center point connection. Continued on next page. No.7811-6/15 LV8220FN Continued from preceding page. Pin No. 24 Pin Name SLFG Pin Description Sled block position detection comparator output. When a stepping mode is used, this pin outputs a comparator signal equivalent to that provided in systems that use three Hall sensors, and when sensorless mode is used, the output is equivalent to a single Hall sensor system FG output. This pin outputs the low level in H-bridge mode. 37 SPFG Spindle block FG pulse output. This pin outputs a signal equivalent to a single Hall sensor system. Equivalent Circuit VCC 27 SLPD Sled sensorless block VCO control voltage input. Insert a capacitor between this pin and ground. In sensorless operating mode, a control voltage (the VCO control voltage) proportional to the motor speed is created. VCC 1kΩ 1 SPPD Spindle block VCO control voltage input. Insert a capacitor between this pin and ground. A control voltage (the VCO control voltage) proportional to the motor speed is created. 28 SLVCO Sled block sensorless mode VCO oscillator connection. Insert a capacitor between this pin and ground. The VCO oscillator frequency follows the sled motor speed (the SLPD pin voltage). VCC 500Ω 1kΩ VCC 500Ω 32 SPVCO Spindle block VCO oscillator connection. Insert a capacitor between this pin and ground. The VCO oscillator frequency follows the spindle motor speed (the SPPD pin voltage). 29 SLMAX Sled block sensorless mode VCO maximum oscillator frequency setting. Reducing the value of the resistor connected to this pin increases the VCO oscillator frequency. 500Ω 2 SPMAX Spindle block VCO maximum oscillator frequency setting. Reducing the value of the resistor connected to this pin increases the VCO oscillator frequency. 11,30 GND Small signal system ground Continued on next page. No.7811-7/15 LV8220FN Continued from preceding page. Pin No. 31 Pin Name VG2 Pin Description SINK side predrive drive regulator pin. Insert a capacitor between this pin and ground. Equivalent Circuit VG1 20kΩ 31 270kΩ 130kΩ 39 SPCOM Spindle motor common point connection. VG1 33 SPFIL Spindle block position detection comparator waveform synthesizing signal filter connection. Insert a capacitor between this pin and SPCIN (pin 34). 39 34 6k Ω 600Ω 600Ω 33 12kΩ 34 SPCIN Spindle block position detection comparator differential input. Insert a capacitor between this pin and SPFIL (pin 33). 6kΩ 35 SPVS Spindle drive block power supply. Insert a capacitor between this pin and SPGND (pin 36). 35 38 38 40 41 36 UOUT VOUT WOUT SPGND Spindle drive block ground. Spindle driver outputs. Connect these pins to the spindle motor coil. 40 41 36 43 VS2 H-bridge circuit 2 drive power supply. Insert a capacitor between this pin and PGND2 (pin 46). 43 44,45 OUT2F/R H-bridge 2 outputs. 44 46 PGND2 H bridge 2 output block ground connections 45 46 No.7811-8/15 LV8220FN Block Diagram PGND2 VS2 OUT2R OUT2F IN2R IN2F OUT1R OUT1F IN1R IN1F VS1 VCC GND LV8220FN Pre drive Logic Pre drive Logic PGND1 S/S VG1 SINK Pre Driver REG VG2 SLMAX SLVCO VCO Phase comparator CLK 1/N SPBR SPMAX SPVCO Sensourless Logic VCO Phase comparator SLPD SEL S1 S2 S3 Waveform synthesizer 1/N Logic SEL SPPD SPCIN SPFIL Sensourless Logic Spindle Pre drive Waveform synthesizer SLCOM SLVS Sled Pre drive SPCOM SPVS SUO SVO SWO SLGND UOUT VOUT WOUT SPGND SLPWM SLFG SPFG SPPWM No.7811-9/15 LV8220FN Sample Application Circuit VS VS 36 SPGND DSP 37 SPFG 38 UOUT Spindle motor 39 SPCOM 40 VOUT 41 WOUT DSP VS 42 SPPWM 43 VS2 44 OUT2F 45 OUT2R 46 PGND2 47 SPBR DSP 48 S/S SPPD 1 35 SPVS 34 SPCIN 33 SPFIL 32 SPVCO 31 VG2 30 GND 29 SLMAX 28 SLVCO 27 SLPD 26 SLVS 25 SLGND SLFG 24 SUO 23 SLCOM 22 Sled motor SVO 21 SWO 20 DSP LV8220FN SLPWM 19 VS1 18 OUT1F 17 OUT1R 16 PGND1 15 IN1R 14 VS DSP SPMAX IN2R IN2F VG1 VCC CLK S2 S3 GND IN1F 13 SEL 12 2 3 4 5 6 7 S1 8 9 10 11 DSP VG1 VCC DSP Insert a capacitor between VS and PGND and between VCC and GND. No.7811-10/15 LV8220FN LV8220FN Functional Description and Notes on External Components The LV8220FN is a system motor driver IC that can implement, with just a single chip, the motor driver circuits required for CD and MD systems. Since the LV8220FN provides not only a spindle driver, but drivers (with an Hbridge structure) for sled, focus, and tracking motors, it can contribute to miniaturization and thinner form factors in end products. Since the spindle and sled drivers adopt a direct PWM sensorless drive technique, they provide high efficiency motor drive with a minimal number of external components. Read the following notes before designing driver circuits using the LV8220FN to design a system with fully satisfactory characteristics. 1. Channel Structure The LV8220FN drive circuits have the 4-channel structure shown below. To minimize power loss in the output blocks, this IC adopts synchronous commutation direct PWM (the recommended PWM frequency is 132kHz) in all channels, and at the same time, adopts low on-resistance DMOS devices (total high and low side on-resistance: 0.8Ω, typical) as the output transistors. Furthermore, this IC’s sled driver channel can operate in either three-phase sensorless or three-phase stepper drive mode as selected by the SEL pin. Applications Spindle Sled Focus Tracking Select the mode on SEL pin Three-pahse sensorless Three-phase stepping H-bridge Remarks 2. Power Supply Pins The LV8220FN has six power supply pins: the small signal system circuit power supply VCC (pin 6), the source output gate drive power supply VG1 (pin 5), and power supplies for each of the output transistors, namely SPVS (pin 35), SLVS (pin 26), VS1 (pin 18), and VS2 (pin 43). All of these pins must be connected to an external power supply. (Since this IC does not include a built-in charge pump circuit for output gate drive, power must also be supplied to the VG1 pin.) Since VG2 (pin 31) is the output of an internal 4V regulator, there is no need to connect a power supply to this pin. Note that capacitor must be inserted between each power supply pin and ground. When power is first applied, it is desirable to apply power in the order VS first, then VG1, and finally VCC. Although no problems with IC operation will occur of any other order is used, note that circuit current (ICC) may flow during the period until all power supply levels have been provided. 3. S/S Circuit The S/S pin (pin 48) functions as the system start/stop pin. A high level starts IC operation and causes all channels to operate in drive mode. A low level switches the IC to the standby state (power saving mode). In the standby state, all power supply currents go to zero. Total system power consumption can be reduced by manipulating the S/S pin to operate the drivers intermittently. Note that the S/S pin must be held at the low level while the VCC power supply level is first applied. 4. CLK Pin The LV8220FN CLK pin (pin 7) must be connected to the reference clock signal supplied by the DSP. The CLK signal is used as the reference clock for spindle block and sled block sensorless drive logic operation. Therefore, the CLK signal is always required in start mode. A frequency 32 times that of the PWM input signal must be provided as the CLK input signal. (Example: when the SPPWM and SLPWM input frequency is 132kHz, the CLK signal must be 4.224MHz.) No.7811-11/15 LV8220FN 5. Spindle Driver Circuit 5.1 Speed Control Techniques Spindle clock speed control uses the BRK control signal and the PWM control signal supplied by the external DSP. The PWM control signal from the DSP is input to the SPPWM pin (pin 42), and the sink (low) side transistor's duty is controlled according to the duty of the input signal to control the motor speed. When a high level is input to the SPPWM pin, the sink side transistor is turned on (i.e., acceleration is applied to the motor). The motor is decelerated by either applying short-circuit braking (by turning off the PWM signal), or by applying reverse torque braking by inputting a brake command to the SPBR pin (pin 47). The SPBR pin switches the direction of the torque applied by the driver; when a low level is input to the SPBR pin, the IC switches to reverse torque braking mode. When the motor has slowed to an adequately low speed in reverse torque braking mode (when SPBRK is low), the circuit switches to short-circuit braking to stop the motor. Note that when stopping the motor with the braking function, if the timing with which this circuit switches to short-circuit braking is too fast and problems such as the motor remaining in motion occur, the value of the resistor connected to the SPMAX pin (pin 2) must be reduced. If the motor moves back and forth without stopping and the IC does not switch to short-circuit braking when the speed approaches zero, insert a resistor with a value from a few kΩ up to under 100kΩ at the SPCOM pin (pin 39). (Verify that insertion of this resistor does not degrade the startup characteristics.) The spindle driver circuit uses variable-duty soft switching to reduce motor drive noise for quiet operation. 5.2 Spindle Block Position Detection Comparator Circuit The spindle block position detection comparator circuit is provided to detect the position of the rotor using the back EMF generated when the motor turns. The IC determines the timing with which the output block applies current to the motor based on the position information acquired by this circuit. Startup problems due to comparator input noise can be resolved by inserting a capacitor (about 1000 to 4700pF) between the SPCIN pin (pin 34) and the SPFIL pin (pin 33). Note that if this capacitor is too large, the output commutation timing may be delayed at higher speeds and efficiency may be lowered. 5.3 VCO Circuit Constants The LV8220FN spindle block adopts a sensorless drive technique. Sensorless drive is implemented by detecting the back EMF signal generated by the motor and setting the commutation timing accordingly. Thus the timing control uses the VCO signal. We recommend using the following procedure to determine the values of the VCO circuit's external components. (1) Connect components with provisional values. Connect a 1µF capacitor and a 4.7MΩ resistor in parallel between the SPPD pin (pin 1) and ground, connect a 68kΩ resistor between SPMAX (pin 2) and ground, and connect a 3300pF capacitor between SPVCO (pin 32) and ground. (2) Determine the value of the SPVCO pin (pin 32) capacitor. Select a value such that the startup time to the target speed is the shortest and such that the variations in startup time are minimized. If the value of this capacitor is too large, the variations in the startup time will be excessive, and if too small, the motor may fail to turn. Since the optimal value of the SPVCO pin constant differs with the motor characteristics and the startup current, the value of this component must be verified again if the motor used or any circuit specifications are changed. (3) Determine the value of the SPMAX (pin 2) resistor. Select a resistor value such that the SPPD pin voltage is about VCC-1.0V or lower with the motor operating at the target maximum speed. If the value of this resistor is too large, the SPPD pin voltage may rise excessively. (4) Determine the value of the SPPD pin (pin 1) capacitor. If the SPFG output (pin 37) pulse signal becomes unstable at the lowest motor speed that will be used, increase the value of the SPPD pin capacitor. (5) Determine the value of the resistor connected between the SPPD pin (pin 1) and ground. The LV8220FN generates a VCO control voltage that corresponds to the spindle motor speed at the SPPD pin. When the S/S pin is used to implement intermittent drive to reduce system power consumption, the potential of the SPPD pin in power saving mode remains fixed at the level determined by the charge stored on the capacitor. Therefore, it is necessary to attach a large resistor (several MΩ) for voltage discharge to the SPPD pin. Choose a value for this resistor such that the time for complete discharge is longer than the motor freerunning deceleration time. Note that if an oscilloscope probe is attached to the SPPD when determining the value of this constant, the discharge characteristics will differ due to the probe impedance. This issue requires care when testing in an actual system. (We recommend using an FET probe.) If intermittent drive (freerunning deceleration) is not used, this discharge resistor is not required. No.7811-12/15 LV8220FN 5.4 Spindle FG Output Circuit The SPFG pin (pin 37) is the spindle block FG output, and outputs a pulse signal equivalent to a single Hall sensor FG output. This pin goes to the low level (MOS output circuit) in power saving mode and short braking stop mode. Note that the SPFG pin is susceptible to damage from ESD, and requires care during handling. (This only applies to the SPFG pin; the SLFG pin does not have this issue.) 6. Sled Driver Circuit 6.1 Mode Settings The LV8220FN sled driver circuit has two modes, three-phase sensorless and three-phase stepper drive mode. The mode is selected with the SEL pin (pin 12). The functions of this IC's S1 to S3 pins (pins 8, 9, and 10) are switched according to the drive mode as shown in the table. Operation mode Three-phase stepping Three-phase sensorless Mode settings SEL1 L H F/R S1 Pin name and function S2 Decoder input BRK S3 SLFG outputs three Hall sensor equivalent. SLFG outputs a Hall sensor equivalent Remarks Note: When a low level is input to the S2 pin (F/R function), this circuit has the same commutation logic as the spindle block. This IC’s sled driver can operate in speed control (torque control) mode controlled by a PWM signal input to the SLPWM (pin 19) pin. Like the sensorless block, torque control is applied to the sink side transistor, and the sink side transistor is turned on (for acceleration) when the SLPWM pin is high. 6.2 Stepping Mode Operation Set the SEL pin low to use the sled driver in three-phase stepping mode. Sled Motor Stepping Logic (When SEL is low) S/S H H H H H H H H L S1 L H L H L H L H × S2 L L H H L L H H × S3 L L L L H H H H × SUO H H Z L L Z Z Z Z SVO L Z H H Z L Z Z Z SWO Z L L Z H H Z Z Z Inner area FG L→H H→L L→H H→L L→H H→L L L L Outer area FG H→L L→H H→L L→H H→L L→H L L L Inner area ↑ ↑ ↑ ↑ ↑ ↑ Change to the decoder input Outer area ↓ ↓ ↓ ↓ ↓ ↓ Change to the decoder input Notes: Z: Open (both the high side and low side transistors off) The inner/outer changes follow the specifications of the Sanyo LC896442 DSP. The stepping mode drive logic operates as shown in the table. The S1 to S3 pins (pins 8, 9, and 10) are the sled driver decoder inputs and include internal pull-up resistors. These pins are connected to the DSP. The LV8220FN allows the drive torque to be controlled by the signal input to the SLPWM pin (pin 19). (This circuit supports synchronous commutation.) The SLFG pin (pin 24) is the sled driver position detection comparator output, and has a MOS output circuit. In stepping mode, it outputs a signal equivalent to a three-phase FG signal. This pin's output signal is used to feed back the sled motor speed information (position information) to the DSP or microcontroller. No.7811-13/15 LV8220FN 6.3 Sensorless Mode Operation and Determining External Component Values When the sled driver is used in three-phase sensorless mode, set the SEL1 pin high and the SEL2 pin low. Although basic operation in sensorless mode is the same as that of the spindle block, the sled sensorless mode has a forward/reverse function and uses a hard switching drive method. The S1 pin (pin 8) is used for forward/reverse switching in sled sensorless mode, and the S2 pin (pin 9) is used for braking. The IC applies reverse torque braking when S2 is set high. (Note: this has the reverse phase input from that of the spindle block braking pin, SPBRK.) Like the spindle driver, reverse torque braking mode (when S2 is high) slows the motor to and adequately slow speed, switches to short-circuit braking state, and stops. Note that when stopping the motor with the braking function, if the timing with which this circuit switches to short-circuit braking is too fast and problems such as the motor remaining in motion occur, the value of the resistor connected to the SLMAX pin (pin 29) must be reduced. If the motor moves back and forth without stopping and the IC does not switch to short-circuit braking when the speed approaches zero, insert a resistor with a value from a few kΩ up to under 100kΩ at the SLCOM pin (pin 22). (Verify that insertion of this resistor does not degrade the startup characteristics.) Although the sled driver can be set to the standby state by stopping the motor with the S2 (brake) pin, the internal circuits used for sensorless drive will continue to operate. Therefore, it is desirable to set the circuit to the standby state in stepping mode to minimize circuit current. The procedure for determining the VCO circuit external component values for sled sensorless mode is essentially the same as that for the spindle block VCO external components. (See the description of that procedure earlier in this document.) For the initial provisional component values, connect a 1µF capacitor and a 4.7MΩ resistor in parallel between the SLPD pin (pin 27) and ground, connect a 56kΩ resistor between SLMAX (pin 29) and ground, and connect a 1500pF capacitor between SLVCO (pin 28) and ground. Then determine the optimal capacitance for SLVCO, the optimal resistance for SLMAX, and the optimal capacitance and resistance for SLPD. In sled sensorless mode, the SLFG pin outputs a pulse signal equivalent to a single Hall sensor FG signal. 7. Actuator Block The LV8220FN incorporates three H-bridge channels for use as actuator drivers for the focus and tracking systems. The logic input pin include built-in pull-down resistors. A PWM signal is used for control, and the circuit supports synchronous commutation. The figures below show reference data related to the dead band during control. LV8220FN Actuator Small-Signal I/O Characteristics VCC=VS=2.3V PWM=132kHz (0-2.3V) OUT[V] LV8220FN Actuator Small-Signal I/O Characteristics (magnified) VCC=VS=2.3V PWM=132kHz (0-2.3V) OUT[mV] 3 100 80 60 1 40 20 0 2 -2.5 -2 -1.5 -1 -0.5 -1 0 0.5 1 1.5 2 2.5 IN[V] 0 -100-80 -60 -40 -20 -20 -40 -60 -80 -100 0 20 40 60 80 100 IN[mV] -2 -3 No load 50Ω 10Ω No load 50Ω 10Ω The input and output are smoothed with a low-pass filter consisting of a 1.0kΩ resistor and 2.2µF capacitor. The input and output are smoothed with a low-pass filter consisting of a 1.0kΩ resistor and 2.2µF capacitor. No.7811-14/15 LV8220FN 8. Notes on PCB Pattern Design The LV8220FN is a system driver IC implemented in a Bi-DMOS process; the IC chip includes bipolar circuits, MOS logic circuits, and MOS drive circuits integrated on the same chip. As a result, extreme care is required with respect to the pattern layout when designing application circuits. 1) Ground and VCC/VS wiring layout The LV8220FN ground and power supply pins are classified as follows. Small-signal system ground pins → GND (pin 30) Large-signal system ground pins → PGND1 (pin 15), PGND2 (pin 46), SPGND (pin 36), SLGND (pin 25) Small-signal system power supply pin → VCC (pin 6) Large-signal system power supply pins → VS1 (pin 18), VS2 (pin 43), SPVS (pin 35), SLVS (pin 26) A capacitor must be inserted, as close as possible to the IC, between the small-signal system power supply pin (pin 6) and ground pins (pin 30). The large-signal system ground pins (PGND system) must be connected with the shortest possible lines, and furthermore in a manner such that there is no shared impedance with the small-signal system ground lines. Capacitors must also be inserted, as close as possible to the IC, between the large-signal system power supply (VS system) pins and the large-signal system ground pins. 2) Positioning the small-signal system external components The small-signal system external components that are also connected to ground must be connected to the smallsignal system ground with lines that are as short as possible. SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of May, 2007. Specifications and information herein are subject to change without notice. PS No.7811-15/15