AN8481SB

AN8481SB PANASONIC

Document overview

• Manufacturer or author: Provided By digicamel.com
• PDF pages: 6

Technical content

Spindle motor driver IC for optical disk n Overview The AN8481SB is a high performance IC suited for driving a spindle motor of an optical disk such as CD-ROM, PD, DVD, CD-R, CD-RW, etc. n Features

• Adopting the 3-phase full-wave soft switch sys- tem
• With switching regulator control function
• With start and stop pin
• Reverse breaking by EC/ECR voltage
• With Hall bias pin
• Surface-mount small package n Applications
• High speed CD-ROM drive
• PD, DVD, CD-R, CD-RW drives Unit: mm HSOP042-P-0400 17 8 1 4 (1.315) 0.65±0.20 28 22 21 (4.8) (6.4)(1.2) (5.15) 18.4±0.2 10.93±0.30 0.35+0.10 –0.05 0.30 +0.10 –0.05

0.8 Seating plane

0° to 10°

Amp. Amp. Absolute value Triangular wave Detection Direction detection Lower side V CE detection Lower side distribution Upper side distribution Direction changeover Amp. Hall amp. matrix Hall bias Start/stop Thermal protection circuit FG comparator VTL ER EA EP = ER · EA Logic n Pin Descriptions Pin No. Symbol Description

11 EC Torque command input pin

12 PCI Current feedback phase compensation pin

13 V CC Supply voltage pin

14 SG Signal GND pin

15 FC Triangular wave oscillation pin

16 SWG SW-REG system GND pin

17 SWB SW-REG driving pin

18 PCS SW-REG system phase compensation pin

19 V REG Fixed power supply pin

20 VM Motor supply voltage pin

Pin No. Symbol Description 1H 1 + Hall element-1 positive input pin 2H 1 - Hall element-1 negative input pin 3H 2 + Hall element-2 positive input pin 4H 2 - Hall element-2 negative input pin 5H 3 + Hall element-3 positive input pin 6H 3 - Hall element-3 negative input pin

7 VH Hall bias pin

8 SS Start/stop changeover pin

9 FG FG signal output pin

10 ECR Torque command reference input pin

n Pin Descriptions (continued) Pin No. Symbol Description

25 A3 Drive output 3

26 A2 Drive output 2

27 A1 Drive output 1

28 PG Power GND pin

Pin No. Symbol Description

21 REF SW-REG reference setting pin

22 CS1 Current det. pin 1 23 N.C. N.C. 24 N.C. N.C. n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 7.0 V V M 14.4 V REG Control signal input voltage *4 V (n) 0 to VCC V Supply current I CC 30 mA Output current *3 IO(n) –1 200 mA Hall bias current I HB 50 mA Power dissipation *2 PD 667 mW Operating ambient temperature *1 T opr -20 to +70 °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: For 70°C and IC alone. n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 4.25 to 5.5 V V M 4.5 to 14 V REG n Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Overall Circuit current 1 I CC1 V CC = 5 V in power save mode ¾ 00 . 1 m A Circuit current 2 I CC2 V CC = 5 V, IO = 0 mA ¾ 81 6 m A Start/stop Start voltage V START Voltage with which a circuit operates 3.5¾¾ V at VCC = 5 V and L fi H Stop voltage V STOP Voltage with which a circuit becomes¾¾ 1.0 V off at VCC = 5 V and H fi L

n Electrical Characteristics at Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit Hall bias Hall bias voltage V HB V CC = 5 V, IHB = 20 mA 0.7 1.2 1.6 V Hall amplifier Input bias current I BH V CC = 5 V ¾ 15 mA In-phase input voltage range V HBR V CC = 5 V 1.5 ¾ 4.0 V Minimum input level V INH V CC = 5 V 60 ¾¾ mV[p-p] Torque command In-phase input voltage range EC V CC = 5 V 1 ¾ 3.9 V Offset voltage EC OF V CC = 5 V -150 0 150 mV Dead zone EC DZ V CC = 5 V 50 100 150 mV Input current EC IN V CC = 5 V, EC = ECR = 2.5 V -5 -1 ¾m A Input/output gain A CS V DD = 5 V, RCS = 0.5 W 0.31 0.41 0.51 A/V Output High-level output saturation voltage VOH V CC = 5 V, IO = -300 mA ¾ 0.9 1.6 V Low-level output saturation voltage VOL V CC = 5 V, IO = 300 mA ¾ 0.2 0.6 V Torque limit current I TL V CC = 5 V, RCS = 0.5 W 390 530 670 mA FG FG output high-level FG H V CC = 5 V, IFG = - 0.01 mA 3.0 ¾ V CC V FG output low-level FG L V CC = 5 V, IFG = 0.01 mA ¾¾ 0.5 V In-phase input voltage range V FGR V CC = 5 V, 1.5 ¾ 3.0 V Input D-range at H2+, H2- FG hysteresis width H FG V CC = 5 V 1 10 20 mV Triangular wave oscillation circuit Charging current I CH V CC = 5 V, FC = 0.5 V -100 -50 -25 mA Discharging current I DCH V CC = 5 V, FC = 2.5 V 25 50 100 mA Lower side voltage detection circuit Input to output gain G V1 V CC = 5 V 5 10 20 times SW-REG driving circuit PNP driving current I SWB V CC = 5 V 10 50 ¾ mA

• 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 CC = 5 V, DEC = 100 mV ¾ 170 ¾° C temperature Thermal protection hysteresis widthDTSD V CC = 5 V, DEC = 100 mV ¾ 45 ¾° C

Prevent this IC from being line-to-ground fault. (To be concrete, do not short-circuit any of pins A1 (pin 27), A2 (pin 26) and A3 (pin 25) to VREG pin (pin 19) or VM pin (pin 20).) n Application Notes

• PD ¾ Ta curves of HSOP042-P-0400 PD ¾ Ta 200 400 600 800 1 000 1 042 2 232 1 200 1 400 1 600 1 800 2 000 2 200 2 400 Power dissipation PD (mW) 0 25 150 Ambient temperature Ta (°C) 50 75 100 125 Independent IC without a heat sink R th( j-a) = 120°C/W PD = 1 042 mW (25°C) Mounted on standard board (glass epoxy: 75 · 75 · t1.6 mm3) R th(j-a) = 56°C/W PD = 2 232 mW (25°C)
• Phase conditions between Hall input and output current 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

n Application Circuit Example ECR Servo-torque command Amp. Amp. Absolute value Triangular wave Detection Direction detection Lower side V CE detection Lower side distribution Upper side distribution Direction changeover Amp. Hall amp. matrix Hall bias Start/stop Thermal protection circuit FG comparator VTL ER EA EP = ER · EA Logic CS1 PG VM V REG REF PCS SWB SWG GND FC H1 + H1 - H2 + H2 - H3 + H3 - VH EC 2 700 pF V CC V CC = 5V PCI S/S System control High: Start 1 kW 12 V 200 W 1 mF 100 mF 68 mH 0.1 mF R CS = 0.5 W 0.1 mF FG