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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.
Package Dimensions
unit : mm
3148-QFP44MA
[LB8118M]
Functions and Features
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 tracking coil, motor, and the sled motor). . coil, the circuit (voltagethe spindleby an external resistor) on chip that is used to apply voltage to the CD DSP, ASP and Step-up to be set . . . . . . . . . . . .
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.
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D3097HA (II) No.5825-1/11
LB8118M
Specifications
Absolute Maximum Ratings at Ta = 25 C
Parameter Maximum supply voltage VCD pin input voltage H bridge output current Allowable power dissipation Operating temperature Storage temperature Symbol VCCmax VCDmax IOUTmax Pd max Topr Tstg Maximum per channel is 400 mA. Independent IC Conditions Ratings 7 10 800 700 -20 to +75 -55 to +150 Unit V V mA mW C C
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage VCD pin input voltage VCC drop setting voltage when external voltage input is applied H Bridge limiter voltage Symbol VCC VCD VCC(EXT) VH lim Conditions Ratings 1.6 to 5.0 3.6 to 9.0 3.0 to 5.0 0.15 to 2.25 Unit V V V V
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 S/S = [H], the total of VCC and VCD S/S = [L], VCC line only S/S = [L], with no driver input min typ max 100 11.0 4.0 2.0 200 IO = 1 mA VASP = 3.4 V, L = 30 H, C = 220 F VASP = 3.4 V, L = 30 H, C = 220 F 50 0.5 0.5 VAPC = 3.4 V, L = 30 H, C = 220 F VAPC = 3.4 V, L = 30 H, C = 220 F 50 IO = 200 mA, TOP + BOTTOM VOUT 1 Each VIN = VASPREF VOUT = 2.25 V, L = 30 H VOUT = 2.25 V, L = 30 H 0.5 Each VIN = VASP REF Each VIN = VASP REF RL = 10 RL = 10 RL = 10 RL = 10 1.2 7.95 10.0 -1.0 0 0 0 +1.0 30 0.30 2.25 0.17 VOUT/60 0.2 Unit A mA mA mA nA V
1000 mV/A 100 mV/V % mA nA V 1000 mV/A 100 mV/V % 200 V V V mA 1000 mV/A 100 mV/V VCD-0.5 2.0 VCD-1.3 V A V dB dB dB mV 0.45
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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 VASP REF+0.1 typ max VCD-1.0 200 VSL REF = 2.3 V, VASP REF = 2 V VSL REF = 2.3 V, VASP REF = 2 V -20 -20 2.0 -25 +20 +25 +1.0 100 -2.0 VCC-1.0 0.5 Unit V nA mV mV V V kHz A V V
RIN = 1 k
3.5 200 3.0 20 200
V A V mA nA V V V V V V nA mA 1.0 V V 180 20 200 0.3 C C nA V
VEXT = 4.5 V, RIN = 1 k
IO = 1 mA
0.2 1.0 2.0 0.3 2.0 1.0 200 3.0
2.0 Design target value, Note 1 Design target value, Note 1
IO = 100 A
Note 1: For parameters which have an entry of ``design target value'' in the ``Conditions'' column, no measurements are made.
No.5825-3/11
LB8118M
Allowable power dissipation, Pd max - W Pd max - Ta
Ambient temperature, Ta - C
Pin Assignment
VAPC
VLD
VOSET
1ch/2ch
No.5825-4/11
LB8118M
Pin Functions
Pin No. 1, 2 32, 33 Symbol IN1, IN2 IN3, IN4 Equivalent circuit Function Actuator control signals for each driver: IN1: Focus, IN2: Tracking, IN3: Spindle, IN4: Sled. These signals are input from the ASP (DSP).
to
30
ASPREF
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.) 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 + ( : saturation voltage of upper/lower output Tr) of each 2-channel control output is set by external PWM step-down circuit. Power supply for the actuator driver controller, maximum value circuit for PWM, and sled controller. Base drive output pin for the external NPN-Tr for the battery pulse charging circuit. Base drive output pin for the external step-down NPN-Tr used when external voltage input is applied. 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.) 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.) Base drive output pin for the external NPN-Tr for the step-up circuit that sets the external voltage for the DSP. Base drive output pin for external NPNTr for the laser diode APC power supply.
3 31
VOUT1 VOUT2
4
VCD
5
CHGDRV
9
EXTDRV
14
DNB-1
Constant current value of each
15
DNB-2
Constant-current circuit which changes with the input of CH1 through 4. (3 mA max)
17
ASPDRV
24
APCDRV
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LB8118M
Continued from preceding page.
Pin No. 6 Symbol CHG MON Equivalent circuit Function 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.). 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. LB8118M GND pin for small-signal block. (GND except output power Tr) 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.
12
EXTBASE
7
GND
8
OSC
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.). 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.). 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.). Connection pin for the resistor that is used to set the voltage of the step-up circuit. This prevents invalid current in standby mode. 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. LB8118M start-up input. (Start on a low-level input.)
11
VEXTCHG
18
VASP
19
UPBASE
20
VZ
Reference voltage startup circuit
External power input Forced startup
27
S/S
Continued on next page.
No.5825-6/11
LB8118M
Continued from preceding page.
Pin No. 23 VLD Symbol Equivalent circuit Function Laser diode voltage detection pin. The VLD voltage +0.5 V is 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. 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.
24
VAPC
16
Voset
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. Input pin for simultaneously muting the four- channel drivers. (Low level: mute) 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.) Pin for switching the sled driver between V-type control and step control. (High: V-type control; low: step control) Power supply voltage pin. 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)
28
MUTE
44
1ch/2ch
34
SLMODE
26 29 33
VCC SLREF IN4
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. 21 BO Symbol Equivalent circuit Function Battery check comparator output. Internal output current is 100 A.
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
1ch/2ch switch
Clamp + Offset
Maximum value
Error amplifier
To microcontroller
Inverted output
Clamp + Offset
Sawtooth waveform oscillation circuit
Clamp + Offset
ASP (3.3V) UP CONVERTER Error amplifier DC/DC Converter See Sample Application
Start-up
Dead time
Error amplifier
APC (2.5 V) UP CONVERTER
Judge ext. power Forced startup External power
APC Drive
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: )
Figure 1
DC 2.6 V Up/down Sample Application
Coil: Manufactured by Toko NPN Tr: D1012
2.5 V to VDD Unit (resistance: ) Figure 2 DC 3.5 V Sample Application (when laser power supply is VDD)
No.5825-10/11
LB8118M
Supplementary Explanation 1. 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.)
2.
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

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