LB8118M

LB8118M SANYO | Alldatasheet

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Actuator Driver for Portable CD Players 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. Package Dimensions unit : mm 3148-QFP44MA [LB8118M] SANYO : QIP44MAFunctions and Features .H bridge drivers (output dynamic range maximum is about 2 V) on chip for four channels to drive each CD actuator (the focus coil, the tracking coil, the spindle motor, and the sled motor). .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 V osat 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 V oset 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 V CC 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. Ordering number: EN*5825 Monolithic Digital IC LB8118M Preliminary 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

Absolute Maximum Ratings a tT a=2 5°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage V CC max 7V VCD pin input voltage V CD max 10 V H bridge output current I OUT max Maximum per channel is 400 mA. 800 mA Allowable power dissipation Pd max Independent IC 700 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C Allowable Operating Rangesat Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage V CC 1.6 to 5.0 V VCD pin input voltage V CD 3.6 to 9.0 V VCC drop setting voltage when external voltage input is appliedVCC(EXT) 3.0 to 5.0 V H Bridge limiter voltage V H lim 0.15 to 2.25 V Electrical Characteristicsa tT a=2 5°C, VCC =3V ,V CD =4V Parameter Symbol Conditions min typ max Unit [Power Supply Block] Standby current drain I CCO S/S = [H], the total of VCC and VCD 100 µA VCC quiescent current drain I CC S/S = [L], VCC line only 11.0 mA VCD quiescent current drain I CD S/S = [L], with no driver input 4.0 mA [ASP step-up circuit] ASP drive output current I O ASPDRV 2.0 mA VASP pin input bias current I B VASP 200 nA ASPBASE pin saturation voltage VO ASPBASE IO = 1 mA 0.2 V Load regulation R LD ASP VASP = 3.4 V, L = 30 µH, C = 220 µF 1000 mV/A Line regulation R LN ASP VASP = 3.4 V, L = 30 µH, C = 220 µF 100 mV/V Minimum off duty D min ASP 50 % [APC step-up circuit] APC drive output current I O APCDRV 0.5 mA VAPC pin input bias current I B VAPC 200 nA VAPC –V LD voltage V APC – LD 0.5 V Load regulation R LD APC VAPC = 3.4 V, L = 30 µH, C = 220 µF 1000 mV/A Line regulation R LN APC VAPC = 3.4 V, L = 30 µH, C = 220 µF 100 mV/V Minimum off duty D min APC 50 % [H Bridge Output Block, PWM Block] Output saturation voltage V H sat IO = 200 mA, TOP + BOTTOM 0.30 0.45 V Maximum output voltage V PWM max V OUT 1 2.25 V PWM applied offset voltage V PWMOFF Each VIN =V ASPREF 0.17 V DNB – 1,2 pins output current Io DNB1,2 V OUT /60 mA Load regulation R LD PWM VOUT = 2.25 V, L = 30 µH 1000 mV/A Line regulation R LN PWM VOUT = 2.25 V, L = 30 µH 100 mV/V [Drive Control Block] CH1 to 4 input voltage range V IN1–4 0.5 V CD –0.5 V Input bias current I BI N Each VIN =V ASP REF 2.0 µA ASP REF input voltage range V ASPR Each VIN =V ASP REF 1.2 V CD –1.3 V CH1,2,4 transfer gain G124 IN R L =1 0Ω 7.95 dB CH3 L side transfer gain G3L IN R L =1 0Ω 10.0 dB Negative/positive transfer gain difference ΔG IN R L =1 0Ω –1.0 0 +1.0 dB Input dead zone voltage range V DZ R L =1 0Ω 0 0 30 mV Continued on next page. LB8118M No.5825-2/11

Continued from preceding page. Parameter Symbol Conditions min typ max Unit [SLED Drive Circuit] SL REF pin input voltage range VSL REF VASP REF +0.1 V CD –1.0 V SL REF pin input bias current IB SL REF 200 nA Positive side setting offset voltage between IN4 and SL REF V off SL REF VSL REF = 2.3 V, VASP REF = 2 V –20 +20 mV Dual side step width difference voltage VSL DIF VSL REF = 2.3 V, VASP REF = 2 V –20 +25 mV SL MODE pin high voltage V H SL MODE 2.0 V SL MODE pin low voltage V L SL MODE –25 +1.0 V [OSC Block] Maximum oscillation frequency FOSC max 100 kHz Input bias current I B OSC –2.0 µA [S/S Pin Function] S/S start voltage V SS ON VCC –1.0 V S/S off voltage V SS OFF 0.5 V [External Voltage Input Block] Minimum operating input voltage when external voltage input is applied V EXT min R IN =1k Ω 3.5 V EXTDRV pin output current I O EXT DRV 200 µA VZ pin voltage V Z VEXT = 4.5 V, RIN =1k Ω 3.0 V VZ pin inflow current I VZ 20 mA VEXT ,V EXT -CHG pin Input bias current IB EXTCHG IB EXT 200 nA EXTBASE pin saturation voltage VEXTBASE IO = 1 mA 0.2 V [Muting Block] Mute on voltage V ON MUTE 1.0 V Mute off voltage V OFF MUTE 2.0 V [Pulse Charging Function] Internal reference voltage V CHG REF 0.3 V CHG-ON pin ON voltage V CHG-ON 2.0 V CHG-ON Pin OFF voltage V CHG-OFF 1.0 V CHG-MON pin input bias current IB CHG MON 200 nA CHGDRV pin output current I O CHG DRV 3.0 mA [H Bridge 1-channel/2-channel drive switch] 1-channel/2-channel switching, 2-channel on voltage V L 1ch/2ch 1.0 V 1-channel/2-channel switching, 1-channel on voltage VH 1ch/2ch 2.0 V [TSD Block] Operating temperature T TSD Design target value, Note 1 180 °C Temperature hysteresis width ΔTTSD Design target value, Note 1 20 °C [Battery Check Block] Input bias current I BIN 200 nA Output saturation voltage V BO IO = 100 µA 0.3 V Note 1: For parameters which have an entry of ‘‘design target value’’ in the ‘‘Conditions’’ column, no measurements are made. LB8118M No.5825-3/11

Allowable power dissipation, Pd max – W Ambient temperature, Ta –°C Pd max – Ta VLD VAPC 1ch/2ch VOSET LB8118M No.5825-4/11

Pin No. Symbol Equivalent circuit Function 1, 2 32, 33 IN1, IN2 IN3, IN4 to Actuator control signals for each driver: IN1: Focus, IN2: Tracking, IN3: Spindle, IN4: Sled. These signals are input from the ASP (DSP).

30 ASP

REF Control reference signal input pin for each driver. This signal is input from the ASP (DSP). 43, 42 41, 40 38, 37 36, 35 OUT1 +,1– OUT2 +,2– 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.) V OUT 1 VOUT 2 Power supply pins for the H bridge driver. VOUT 1 is for the focus/tracking group and VOUT 2 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. CD Power supply for the actuator driver controller, maximum value circuit for PWM, and sled controller.

5 CHGDRV

Constant currentvalue of each Constant-current circuit which changes with the input of CH1 through 4. (3 mA max) 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.)

15 DNB-2 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. LB8118M No.5825-5/11

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 V EXT Voltage feedback input pin for the external power supply step-down circuit. V CC for playback is set by comparing this pin voltage with the internal reference voltage (1.28 V typ.). 11 V EXTCHG Voltage feedback input pin for the external power supply step-down circuit. V CC for charging is set by comparing this pin voltage with the internal reference voltage (1.28 V typ.). 18 V ASP 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 Reference voltage startup circuit External power input Forced startup 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 + 2V BE ; this pin has a current draining capacity up to 20 mA. 27 S/S LB8118M start-up input. (Start on a low-level input.) Continued on next page. LB8118M No.5825-6/11

Continued from preceding page. Pin No. Symbol Equivalent circuit Function

23 V LD

Laser diode voltage detection pin. The VLD voltage +0.5 V is VAPC .

24 V APC 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 V LD .

16 Voset

H bridge power supply limiter voltage pin for the VOUT 2 side. The voltage is limited at approximately 190% of the V O SET voltage. The setting is made by a dividing resistor.

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 V CC Power supply voltage pin. 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 four- channel H bridge drivers. This pin is not internally connected to the small-signal system GND. LB8118M No.5825-7/11

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. LB8118M No.5825-8/11

ASP (3.3V) UP CONVERTER Error amplifier Start-up Error amplifier APC (2.5 V) UP CONVERTER DC/DC Converter See Sample Application Judge ext. power Forced startup External power Error amplifier Error amplifier Dead time Dead time Clamp + Offset Dead time APC Drive LB8118M No.5825-9/11

1. V CD 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 V CD 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.) 2. 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.) 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. 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. LB8118M No.5825-11/11