AN8488

AN8488SB PANASONIC

Document overview

• Manufacturer or author: Provided By digicamel.com
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Technical content

ICs for Compact Disc/ CD-ROM Player AN8488SB 3-phase full-wave motor driver and DC motor BTL driver IC n Overview The AN8488SB is a motor driver IC incorporat- ing a 3-phase full-wave motor driver and DC motor BTL driver IC with a reverse rotation brake/short brake changeover function. It is encapsulated into a high allowable power dissipation package (with cop- per block). n Features

• 3-phase full-wave and snubberless
• FG output
• Current limit
• Reverse rotation prevention
• Thermal protection circuit built-in n Applications
• Various types of optical disk drive n Block Diagram Unit: mm HSOP042-P-0400C (1.315) 0° to 10° 0.5±0.2 0.30 +0.10– 0.05 (1.95) 1 9 13 21 42 34 30 22 (10.00) 18.4±0.2 2.7±0.20.1±0.1 (1.20) +0.10 – 0.050.350.80 (3.20) Seating plane 8.3±0.2 10.93±0.30 (4.00) V CC2 det. Reset V REF det.

29 VM1

V CC2

2 VM2

amp. matrix Detection Upper side distribution Upper side power Lower side power Lower side distribution Logic Amp. Amp. Direction detection Direction changeover EA ER VTL S/S V CC1 PCI BRK PG1 PG2 SLIN PC FG V REF H1 + H1 - H2 + H2 - H3 + H3 - VH EC ECR SG EP = ER · EA FG comparator

AN8488SB ICs for Compact Disc/ CD-ROM Player n Pin Descriptions n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC1 7.0 V V CC2 14.0 V M1 , VM2 Output voltage 1 *4 V O1(n) - 0.3 to VM1 + 0.4 V Output voltage 2 *5 V O2(n) - 0.3 to VM2 + 0.4 V Control signal input voltage *4 V (n) 0 to VCC1 V Supply current I CC1 30 mA Output current *3 IO(n) –1 200 mA Hall bias current I HB 50 mA Power dissipation *2 PD 786 mW Operating ambient temperature *1 T opr -20 to +75 °C Storage temperature *1 Tstg -55 to +150 °C Note) Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, '+' denotes current flowing into the IC, and '-' denotes current flowing out of the IC. *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: The power dissipation shown is the value of independent IC without a heat sink at Ta = 75°C. Refer to the PD ¾ Ta curves of the "n Application Notes" for details. Pin No. Symbol Description

19 H2 - Hall element-2 negative input pin

20 H3 + Hall element-3 positive input pin

21 H3 - Hall element-3 negative input pin

22 V CC1 SPD block supply voltage pin

23 VH Hall bias pin

24 N.C. N.C.

25 SS Start/stop changeover pin

26 ECR Torque command reference input pin

27 EC Torque command input pin

28 PCI Current feedback phase compensation pin

29 VM1 SPD block motor supply voltage pin

30 N.C. N.C. 31 N.C. N.C.

32 A3 A3 phase output pin

33 N.C. N.C. 34 CS Current det. pin

35 A2 A2 phase output pin

36 A1 A1 phase output pin

Pin No. Symbol Description

1 PG1 SPD block power GND pin

2 PG2 Driver block power GND pin

3 N.C. N.C.

4 VN Driver block inverted output pin

5 PC Driver block power cut pin

6 N.C. N.C.

7 VP Driver block forward output pin

8 N.C. N.C.

9 VM2 Driver block motor power supply pin

10 V CC2 Driver block supply voltage pin

11 SLIN Driver block input pin

12 V REF Driver block reference input pin

13 N.C. N.C.

14 FG FG signal output pin

15 BRK Brake mode setting pin

16 H1 + Hall element-1 positive input pin

17 H1 - Hall element-1 negative input pin

18 H2 + Hall element-2 positive input pin

ICs for Compact Disc/ CD-ROM Player AN8488SB n Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Overall Circuit current 1 I CC1 V CC1 = 5 V, SS: at low ¾ 00 . 1 m A Circuit current 2 I CC2 V CC2 = 12 V, SS: at low ¾ 60 200 mA Start/stop Start voltage V START Voltage with which a circuit operates 2.7¾¾ V at VCC1 = 5 V and L fi H Stop voltage V STOP Voltage with which a circuit becomes¾¾ 0.7 V off at VCC1 = 5 V and H fi L Medium voltage V MED Voltage with which VPC1 becomes 1.425 1.65 1.89 V low at VCC1 = 5 V and EC = 0 V <Spindle block> Hall bias Hall bias voltage V HB V CC1 = 5 V, IHB = 20 mA 0.7 1.2 1.6 V Hall amplifier Input bias current I BH V CC1 = 5 V ¾ 15 mA In-phase input voltage range V HBR V CC1 = 5 V 1.5 ¾ 4.0 V Minimum input level V INH V CC1 = 5 V 60 ¾¾ mV[p-p] Torque command In-phase input voltage range EC V CC1 = 5 V 0.5 ¾ 3.9 V Offset voltage EC OF V CC1 = 5 V -100 0 100 mV Dead zone EC DZ V CC1 = 5 V 25 75 125 mV Input current EC IN V CC1 = 5 V, EC = ECR = 1.65 V -5 - 0.25 ¾m A Input/output gain A CS V CC1 = 5 V, RCS = 0.6 W 0.75 1.0 1.25 A/V Output High-level output saturation voltage VOH V CC1 = 5 V, IO = -300 mA ¾ 0.9 1.6 V Low-level output saturation voltage VOL V CC1 = 5 V, IO = 300 mA ¾ 0.2 0.6 V Torque limit current I TL V CC = 5 V, RCS = 0.6 W 400 500 600 mA n Absolute Maximum Ratings (continued) *4: n = 32, 35, 36 *5: n = 4, 7 n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC1 4.25 to 5.5 V V CC2 4.5 to 13.5 V M1 , VM2

AN8488SB ICs for Compact Disc/ CD-ROM Player n Electrical Characteristics at Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit <Spindle block> (continued) FG FG output high-level FG H V CC1 = 5 V, IFG = - 0.01 mA 3.0 ¾ V CC1 V FG output low-level FG L V CC1 = 5 V, IFG = 0.01 mA ¾¾ 0.5 V In-phase input voltage range V FGR V CC1 = 5 V, 1.5 ¾ 3.0 V Input D-range at H2+, H2- FG hysteresis width H FG V CC1 = 5 V 1 10 20 mV Brake cirrcuit Short brake model level V SBR V CC1 = 5 V ¾¾ 1.0 V Reverse rotation brake mode level VRBR V CC1 = 5 V 3.5 ¾¾ V Short brake start level V SBRL V CC1 = 5 V, ECR = 1.65 V 1.65 1.74 ¾ V Short brake current I SBR V CC1 = 5 V 60 90 ¾ mA <Driver block> Driver R L = 16 W Output offset voltage V DROF SL IN = 1.65 V -150 0 +150 mV + gain G SL + R IN = 10 kW 21 23 25 dB +/- relative gain G SL - 0.7 0 +0.7 dB Output D range '+'V O + SL IN = 3.3 V 9.3 10.0 ¾ V Output D range '-'V O - SL IN = 0 V ¾- 10.0 -9.3 V Power cut operation High-level PC threshold voltage VPCH V CC2 = 12 V 2.9 ¾¾ V Low-level PC threshold voltage V PCL V CC2 = 12 V ¾¾ 1.0 V PC input current I PC V CC2 = 12 V, PC = 5 V ¾ 100 200 mA Reset cirrcuit Reset operation release supply voltage VRST ¾¾ 4.5 V V REF detection voltage V R 1.35 ¾¾

• Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Thermal protection Thermal protection operating T SDON V CC1 = 5 V ¾ 160 ¾° C temperature Thermal protection hysteresis widthDTSD V CC1 = 5 V ¾ 45 ¾° C Sled block supply voltage Sled block supply voltage detectionDV HD ¾ 0.2 ¾ V hysteresis width

ICs for Compact Disc/ CD-ROM Player AN8488SB n Usage Notes 1. Use the VCC2 at VCC2 ‡ VM2 . And use power supply always at on state. Otherwise it will cause malfunction. 2. On driver gain setting of driver block. Voltage gain of power amplifier: 23 dB 3. On operation mode of mute: 10 kW 10 kW 500 W 5.5 kW V REF V REF Input Input pin M

• 7
• 7 Power amp. Output pin Load 4. On SS pin mode: PC H L (Open) Driver output Active Mute 6. Take time to check the characteristics on use. When changing an external circuit constant for use, consider not only static characteristics, but also transient charac- teristics and external parts with respect to the characteristics difference among ICs so that you can get enough margin. 7. Avoid short-circuit between output pin and power supply, output pin and GND (line-to-supply and line-to-ground fault) and output pins (load short-circuit). Otherwise the IC will be damaged and is likely to get fired. 8. Be cautious on a dip soldering. Prior study is required. SS H M L (Open) Spindle block On Off Off Driver block On On Off 5. On brake mode of spindle block: BRK H L (Open) EC < ECR Acceleration Acceleration EC > ECR Reverse rotation brake Short brake

AN8488SB ICs for Compact Disc/ CD-ROM Player

• Phase conditions between Hall input and output current n Application Notes
• PD ¾ Ta curves of HSOP042-P-0400 PD ¾ Ta 0.000 0 25 50 75 100 125 150 3.000 2.723 2.500 2.000 1.500 1.311 1.000 0.500 786 mW 1 634 mW Mounted on standard board (glass epoxy: 75 · 75 · t0.8 mm3) R th(j-a) = 45.9°C/W Independent IC without a heat sink R th(j-a) = 95.3°C/W Power dissipation PD (W) Ambient temperature Ta (°C) A B C D E F Phase of Hall pin H1 + H3 +H2 + HM L HML MLH LMH LM H ML H ECR EC ABCDE H1 H2 H2H1H3 A3 A3 A2 A1 A2 A1 F Emit Output current Sink

ICs for Compact Disc/ CD-ROM Player AN8488SB n Application Notes (continued)

• Power consumption calculation method You can find a rough value of electric power to be consumed in the IC in the following method and the use of EXCEL (computer soft ware) will enable you to put it on a graph. Calculating formula: (Spindle block) 1. Let an induced voltage generated in each phase as below: (Reference to a motor center point) EA1 = EO · sin (X) · · · (1) E A2 = EO · sin (X+120) · · · (2) EA3 = EO · sin (X+240) · · · (3) X: Phase angle 2. Let a current flowing in each phase as below: IA1 = IO · sin (X) · · · (4) I A2 = IO · sin (X+120) · · · (5) IA3 = IO · sin (X+240) · · · (6) 3. The voltages generated by a wire-wound resistance of a motor are: 4. In each phase, add the voltage generated by an induced voltage and that by a wire-wound resistance. 5. As the lowest voltage in each phase angle must be 0 V, you can get the voltage to be generated in each phase by means of subtracting the lowest voltage from the voltage of the remaining two phases. V A1 = V A1 ' - MIN (VA1 ', VA2 ', VA3 ') · · · (10) V A2 = V A2 ' - MIN (VA1 ', VA2 ', VA3 ') · · · (11) V A3 = V A3 ' - MIN (VA1 ', VA2 ', VA3 ') · · · (12) 6. Subtract the supply voltage from each phase's voltage found in item 5 and then multiply it by each phase's current, so that you can get the power consumption of the spindle block. PSPD = S (12 - VAn ) · IAn n=1 (Driver block) PSL = (VM2 - IO · R) · IO V M2 : Motor power supply voltage IO : Output current R: Wire wound resistor
• Theory of thermal resistance A chip temperature or the fin temperature can be understood in the same way as Ohm's Law. Tj : Chip temperature T a : Ambient temperature P : Electric power generated by IC R j-c: Thermal resistance between a chip and a package R c-a: Thermal resistance between a package and a surface of a heat sink or free air Tj = Ta + P · (Rj-c + Rc-a ) Make sure that Tj does not exceed 150°C. If it exceeds 150°C, you can suppress the rise of a chip temperature by adding a heat sink which is equivalent to R f in the above figure. Tj = Ta + P · (Rj-c + Rc-a ) A package surface and the fin are available for a temperature measurement. But the fin part is recommendable for measurement because a package surface measurement does not always promise you a consistent measuring result. Note) What has been mentioned above is true to a stationary state, not to a transient state. R f Tj R j-c R c-a Ta P

AN8488SB ICs for Compact Disc/ CD-ROM Player n Application Circuit Example S/S: High: SPD block on and driver block on Med: SPD block off and driver block on Low: SPD block off and driver block off V CC2 det. Reset V REF det. VM2 V CC2 amp. matrix Detection Upper side distribution Upper side power Lower side power Lower side distribution Logic Amp. Amp. Direction detection Direction changeover EA ER VTL FG comparator H1 + H1 - H2 + H2 - H3 + H3 - VH EC ECR Servo torque command SLIN Low: Short brake High: Reverse rotation break FG signal V CC = 5 V R IN = 10 kW 0.1 mF S/S V CC1 PCI BRK PG1 PG2 SLIN PC FG V REF VM1 VM1 = 12 V SG CS VN VP M R CS = 0.6 W EP = ER · EA