Ordering number: EN*5825 Monolithic Digital IC LB8118M Actuator Driver for Portable CD Players Preliminary Overview The LB8118M is an actuator driver IC designed for portable CD players that operate at 2.4 V (two Ni-Cd batteries) or 3.0 V (two dry cells). Because the four-channel driver control outputs are divided into two groups, this device reduces power dissipation considerably during double-speed play. Functions and Features Package Dimensions unit : mm 3148-QFP44MA [LB8118M] SANYO : QIP44MA . H bridge drivers (output dynamic range maximum is about 2 V) on chip for four channels to drive each CD actuator (the focus the tracking coil, the spindle motor, and the sled motor). . coil, Step-up circuit (voltage to be set by an external resistor) on chip that is used to apply voltage to the CD DSP, ASP and . . . . . . . . . . . . microcontroller. Center-tap coil for step-up circuit makes it possible to supply the driver control voltage. (However, the drive Tr, L, C, and Di are all external.) Oscillator circuits for each converter on chip. (C is external.) Four-channel driver control output is divided into two groups (the focus/tracking group and the spindle/sled group) for minimum loss at double-speed playback. Highest operating voltage detected in each group is supplied for each 2ch H bridge driver after PMW conversion. The single channel PWM drive without dividing the outputs into two groups is also possible. (However, the PWM PNP-Tr, NPN-Tr, L, C, and Di are all external.) The dynamic range of 4-channel H bridge driver output voltage is up to 2 V on the focus and tracking side, and can be set by the Vosat pin on the spindle and sled side. However, if the 4-channel H bridge voltages in the H bridge driver block are the same, the maximum voltage is determined using the Voset pin. Sled motor driving mode is switchable between step drive mode for lower power dissipation, and normal V-type drive mode. (The other three channels are fixed to V-type.) In the spindle motor drive circuit, the control gain can be set higher for double-speed playback. PWM step-down circuit for external power operates when external power (4 V or higher) is supplied. In this function, external power is converted to VCC power supply, and two type voltage setting is possible. In playback mode, step-up voltage for DSP has to be set equal to or lower than VCC, but in charging the battery, it has to be set higher enough than VCC. So step-down voltage (VCC) setting of two types is possible with two pairs of external resistor. (Switching port is provided.) (However, the PWM PNP-Tr, NPN-Tr, L, C, and Di are all external.) APC step-up power supply for the laser diode. (Also supports a pre-power supply for the internal bias.) The laser diode is controlled with a voltage of roughly 0.5 V. Battery pulse charging function on chip. (However, the drive NPN-Tr, and the current feedback C and R are external.) Battery check comparator on chip. The system can be started up and stopped by outputs from the microcontroller. Actuator muting function on chip (for all four channels simultaneously). Thermal shutdown circuit on chip. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN D3097HA (II) No.5825-1/11 LB8118M Specifications Absolute Maximum Ratings at Ta = 25 °C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCCmax 7 VCD pin input voltage VCDmax 10 V H bridge output current IOUTmax Maximum per channel is 400 mA. 800 mA Allowable power dissipation Pd max Independent IC V 700 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Supply voltage VCC 1.6 to 5.0 V VCD pin input voltage VCD 3.6 to 9.0 V VCC(EXT) 3.0 to 5.0 V 0.15 to 2.25 V VCC drop setting voltage when external voltage input is applied H Bridge limiter voltage VH lim Electrical Characteristics at Ta = 25 °C, VCC = 3 V, VCD = 4 V Parameter Symbol [Power Supply Block] Standby current drain ICCO VCC quiescent current drain ICC VCD quiescent current drain ICD [ASP step-up circuit] ASP drive output current IO ASPDRV VASP pin input bias current IB VASP ASPBASE pin saturation VO ASPBASE voltage Load regulation RLD ASP Line regulation RLN ASP Minimum off duty Dmin ASP [APC step-up circuit] APC drive output current IO APCDRV VAPC pin input bias current IB VAPC VAPC – VLD voltage VAPC – LD Load regulation RLD APC Line regulation RLN APC Minimum off duty Dmin APC [H Bridge Output Block, PWM Block] Output saturation voltage VH sat Maximum output voltage VPWM max PWM applied offset voltage VPWMOFF DNB – 1,2 pins output current Io DNB1,2 Load regulation RLD PWM Line regulation RLN PWM [Drive Control Block] CH1 to 4 input voltage range VIN1–4 Input bias current IB IN ASP REF input voltage range VASPR CH1,2,4 transfer gain G124IN CH3 L side transfer gain G3LIN Negative/positive transfer gain ∆GIN difference Input dead zone voltage range VDZ Conditions min S/S = [H], the total of VCC and VCD S/S = [L], VCC line only S/S = [L], with no driver input typ max 100 11.0 4.0 2.0 IO = 1 mA VASP = 3.4 V, L = 30 µH, C = 220 µF VASP = 3.4 V, L = 30 µH, C = 220 µF 50 0.5 Unit µA mA mA 200 mA nA 0.2 V 1000 mV/A 100 mV/V % mA nA V 1000 mV/A 100 mV/V % 200 0.5 VAPC = 3.4 V, L = 30 µH, C = 220 µF VAPC = 3.4 V, L = 30 µH, C = 220 µF 50 IO = 200 mA, TOP + BOTTOM VOUT 1 Each VIN = VASPREF 0.30 2.25 0.17 VOUT/60 VOUT = 2.25 V, L = 30 µH VOUT = 2.25 V, L = 30 µH 0.5 Each VIN = VASP REF Each VIN = VASP REF RL = 10 Ω RL = 10 Ω 1.2 0.45 V V V mA 1000 mV/A 100 mV/V VCD–0.5 2.0 VCD–1.3 V µA V dB dB 7.95 10.0 RL = 10 Ω –1.0 0 +1.0 dB RL = 10 Ω 0 0 30 mV Continued on next page. No.5825-2/11 LB8118M Continued from preceding page. Parameter Symbol [SLED Drive Circuit] SL REF pin input voltage VSL REF range SL REF pin input bias current IB SL REF Positive side setting offset voltage between IN4 Voff SL REF and SL REF Dual side step width difference VSL DIF voltage SL MODE pin high voltage VH SL MODE SL MODE pin low voltage VL SL MODE [OSC Block] Maximum oscillation frequency FOSC max Input bias current IB OSC [S/S Pin Function] S/S start voltage VSSON S/S off voltage VSSOFF [External Voltage Input Block] Minimum operating input voltage when external voltage VEXT min input is applied EXTDRV pin output current IO EXT DRV VZ pin voltage VZ VZ pin inflow current IVZ VEXT, VEXT-CHG pin IB EXTCHG Input bias current IB EXT EXTBASE pin saturation VEXTBASE voltage [Muting Block] Mute on voltage VON MUTE Mute off voltage VOFF MUTE [Pulse Charging Function] Internal reference voltage VCHG REF CHG-ON pin ON voltage VCHG-ON CHG-ON Pin OFF voltage VCHG-OFF CHG-MON pin IB CHG MON input bias current CHGDRV pin output current IO CHG DRV [H Bridge 1-channel/2-channel drive switch] 1-channel/2-channel switching, VL 1ch/2ch 2-channel on voltage 1-channel/2-channel switching, VH 1ch/2ch 1-channel on voltage [TSD Block] Operating temperature TTSD Temperature hysteresis width ∆TTSD [Battery Check Block] Input bias current IBIN Output saturation voltage VBO Conditions min typ VASP REF+0.1 max Unit VCD–1.0 V 200 nA VSL REF = 2.3 V, VASP REF = 2 V –20 +20 mV VSL REF = 2.3 V, VASP REF = 2 V –20 +25 mV 2.0 –25 +1.0 V V 100 –2.0 kHz µA VCC–1.0 RIN = 1 kΩ 0.5 V V 3.5 V 200 3.0 VEXT = 4.5 V, RIN = 1 kΩ IO = 1 mA 20 µA V mA 200 nA 0.2 V 1.0 V V 2.0 0.3 1.0 V V V 200 nA 2.0 3.0 mA 1.0 V 2.0 Design target value, Note 1 Design target value, Note 1 IO = 100 µA V 180 20 °C °C 200 0.3 nA V Note 1: For parameters which have an entry of ‘‘design target value’’ in the ‘‘Conditions’’ column, no measurements are made. No.5825-3/11 Allowable power dissipation, Pd max – W LB8118M Pd max – Ta Ambient temperature, Ta – °C VAPC VLD Pin Assignment VOSET 1ch/2ch No.5825-4/11 LB8118M Pin Functions Pin No. 1, 2 32, 33 Symbol Equivalent circuit IN1, IN2 IN3, IN4 Actuator control signals for each driver: IN1: Focus, IN2: Tracking, IN3: Spindle, IN4: Sled. These signals are input from the ASP (DSP). to 30 Function ASPREF Control reference signal input pin for each driver. This signal is input from the ASP (DSP). 43, 42 OUT1+, 1– 41, 40 OUT2+, 2– 38, 37 36, 35 OUT3+, 3– OUT4+, 4– Focus coil actuator drive output pins. Tracking coil actuator drive output pins. Spindle motor drive output pins. Sled motor drive output pins. (Each channel includes built-in spark killer diodes.) 3 31 VOUT1 VOUT2 Power supply pins for the H bridge driver. VOUT1 is for the focus/tracking group and VOUT2 is for the spindle/sled group. Maximum value + α (α : saturation voltage of upper/lower output Tr) of each 2-channel control output is set by external PWM step-down circuit. 4 VCD Power supply for the actuator driver controller, maximum value circuit for PWM, and sled controller. 5 CHGDRV Base drive output pin for the external NPN-Tr for the battery pulse charging circuit. 9 EXTDRV Base drive output pin for the external step-down NPN-Tr used when external voltage input is applied. 14 DNB-1 Base drive output pin for the PNP-Tr for the step-down PWM that generates the power supply for the H bridge driver that drives the focus/tracking group actuators. (Open when there is one H bridge power supply.) Constant current value of each 15 DNB-2 Constant-current circuit which changes with the input of CH1 through 4. (3 mA max) Base drive output pin for the PNP-Tr for the step-down PWM that generates the power supply for the H bridge driver that drives the spindle/sled group actuators. (DNB-2 becomes the drive pin when there is one H bridge power supply.) 17 ASPDRV Base drive output pin for the external NPN-Tr for the step-up circuit that sets the external voltage for the DSP. 24 APCDRV Base drive output pin for external NPNTr for the laser diode APC power supply. Continued on next page. No.5825-5/11 LB8118M Continued from preceding page. Pin No. Symbol Equivalent circuit Function 6 CHG MON Constant-current feedback input pin for the charging circuit. The charging current is determined by comparing this input voltage and the internal reference voltage (0.35 V typ.). 12 EXTBASE Connection pin for the resistor that is used to set the voltage for the external step-down circuit. This prevents invalid current at no power supply. 7 GND LB8118M GND pin for small-signal block. (GND except output power Tr) 8 OSC Input pin for the free-running oscillation circuit that is used to operate the PWM step-down circuit and step-up circuit. The oscillating frequency is determined by external capacitors. 10 VEXT Voltage feedback input pin for the external power supply step-down circuit. VCC for playback is set by comparing this pin voltage with the internal reference voltage (1.28 V typ.). 11 VEXTCHG Voltage feedback input pin for the external power supply step-down circuit. VCC for charging is set by comparing this pin voltage with the internal reference voltage (1.28 V typ.). 18 VASP Voltage feedback input pin for the step-up circuit. The step-up voltage is determined by comparing this pin voltage with the internal reference voltage (1.28 V typ.). 19 UPBASE Connection pin for the resistor that is used to set the voltage of the step-up circuit. This prevents invalid current in standby mode. 20 VZ Input pin for start-up circuit when an external voltage input is applied. The external voltage input is applied through a resistor inserted in series. The voltage is basically determined 1.2V + 2VBE; this pin has a current draining capacity up to 20 mA. Reference voltage startup circuit 27 S/S External power input Forced startup LB8118M start-up input. (Start on a low-level input.) Continued on next page. No.5825-6/11 LB8118M Continued from preceding page. Pin No. Symbol Equivalent circuit Function 23 VLD Laser diode voltage detection pin. The VLD voltage +0.5 V is VAPC. 24 VAPC Voltage feedback input pin for the APC step-up voltage circuit. The step-up power supply voltage is determined by comparing this input voltage with VLD. 16 Voset H bridge power supply limiter voltage pin for the VOUT2 side. The voltage is limited at approximately 190% of the VO SET voltage. The setting is made by a dividing resistor. To next block 13 CHG-ON Pin for selecting battery charging when external voltage input is applied. This pin is used to determine the drop voltage for the external voltage input. When low, the drop voltage set by VEXT is selected; when high, the drop voltage set by VEXT-CHG is selected. 28 MUTE Input pin for simultaneously muting the four- channel drivers. (Low level: mute) 44 1ch/2ch This pin is used to switch the H bridge power supply between two-channel simultaneous operation and one-channel operation. (Two-channel operation is selected when this pin is low.) 34 SLMODE Pin for switching the sled driver between V-type control and step control. (High: V-type control; low: step control) 26 VCC Power supply voltage pin. 29 33 SLREF IN4 Threshold input pin for driving the sled motor stepwise. Both the positive and negative step levels (with positive-negative symmetry) are determined by the voltage differential between the pin voltage and the ASPREF pin voltage. (See Supplementary Explanation) 39 PGND Output Tr. GND for the fourchannel H bridge drivers. This pin is not internally connected to the small-signal system GND. No.5825-7/11 LB8118M Continued from preceding page. Pin No. Symbol Equivalent circuit Function 21 BO Battery check comparator output. Internal output current is 100 µA. 22 BI Battery check comparator input. Input bias current is 200 nA or less. No.5825-8/11 LB8118M LB8118M Block Diagram Bidirectional drive Bidirectional drive Bidirectional drive Bidirectional drive Error amplifier Maximum value Clamp + Offset Clamp + Offset 1ch/2ch switch Maximum value Error amplifier To microcontroller Clamp + Offset Inverted output Sawtooth waveform oscillation circuit ASP (3.3V) UP CONVERTER Error amplifier DC/DC Converter Dead time Start-up Error amplifier APC (2.5 V) UP CONVERTER See Sample Application Judge ext. power Forced startup APC Drive External power Error amplifier Error amplifier Dead time Dead time No.5825-9/11 LB8118M LB8118M Sample Application Circuit (Ceramic) D879 Low saturation Tr B1302 Low saturation type (for SW) Coil manufactured by Toko Unit (resistance: Ω) Figure 1 DC 2.6 V Up/down Sample Application Coil: Manufactured by Toko NPN Tr: D1012 2.5 V to VDD Unit (resistance: Ω) Figure 2 DC 3.5 V Sample Application (when laser power supply is VDD) No.5825-10/11 LB8118M Supplementary Explanation 1. 2. VCD supply The VCD line is the power supply for the driver control blocks of channels 1 to 4. The VCD line can be supplied from the DSP or ASP step-up circuit by using a coil with center tap (as shown in the Block Diagram). However, because the allowable operating range for VCD is 3.6 V to 9.0 V, it is recommended that in order to reduce power dissipation, the voltage should be set to the lower range. (Even if this power supply does not affect the control performance such as the transfer gain.) Sled step drive Stepping control in this IC for the sled actuator is as described below. Normal V-type control is selected if the SLMODE pin is set high, but by setting this pin low step drive mode with low power dissipation can be selected. (This only affects channel 4.) The step drive starting level is input from the SLREF pin (must be higher than ASPREF), and the positive side step start is determined by comparing the input voltage with IN4. For the negative side, the step start is determined automatically by setting the differential voltage between the SLREF and the ASPREF on the opposite side, and then comparing that voltage to IN4. In other words, the control characteristics become as defined by the solid line in the diagram below. (The rise on the positive and negative steps has no hysteresis.) Voltage between outputs SLREF (greater than ASPREF) If this voltage is set, the negative side step start is determined automatically by setting the differential voltage betwwen SLREF and ASPREF on the opposite side as well. No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of December, 1997. Specifications and information herein are subject to change without notice. No.5825-11/11