ICs for Motor AN8481SB Spindle motor driver IC for optical disk ■ 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. Unit: mm 18.4±0.2 (5.15) (4.8) 28 22 21 15 +0.10 0.30 –0.05 0° to 10° 1 7 8 14 2.7±0.2 0.65±0.20 (1.2) (6.4) 0.8 +0.10 0.35 –0.05 Seating plane 0.1±0.1 • Adopting the 3-phase full-wave soft switch system • With switching regulator control function • With start and stop pin • Reverse breaking by EC/ECR voltage • With Hall bias pin • Surface-mount small package 8.3±0.2 ■ Features 10.93±0.30 (1.315) ■ Applications • High speed CD-ROM drive • PD, DVD, CD-R, CD-RW drives HSOP042-P-0400 1 AN8481SB ICs for Motor PG 28 FG 9 A3 25 A2 26 A1 27 22 20 VM CS1 ■ Block Diagram FG comparator REF VREG PCS SWB 21 Lower 19 side VCE detection Thermal protection circuit Amp. Amp. Upper side distribution 18 12 Direction changeover 17 16 VCC PCI Absolute value Amp. Direction detection SWG 13 VTL Lower side distribution ER Logic EP = ER × EA Start/stop Detection Triangular wave Hall bias 8 EA S/S Hall amp. matrix 10 ECR 11 EC 7 VH 6 H3− 5 H3+ H2− 4 3 H2+ 2 H1+ H1− 1 15 14 FC GND ■ Pin Descriptions Pin No. Symbol 2 Description Pin No. Symbol Description 1 H1+ Hall element-1 positive input pin 11 EC Torque command input pin 2 H1− Hall element-1 negative input pin 12 PCI Current feedback phase compensation pin 3 H2+ Hall element-2 positive input pin 13 VCC Supply voltage pin 4 H2− Hall element-2 negative input pin 14 SG Signal GND pin 5 H3+ Hall element-3 positive input pin 15 FC Triangular wave oscillation pin 6 H3− Hall element-3 negative input pin 16 SWG SW-REG system GND pin 7 VH Hall bias pin 17 SWB SW-REG driving pin 8 SS Start/stop changeover pin 18 PCS SW-REG system phase compensation pin 9 FG FG signal output pin 19 VREG Fixed power supply pin 10 ECR Torque command reference input pin 20 VM Motor supply voltage pin ICs for Motor AN8481SB ■ Pin Descriptions (continued) Pin No. Symbol Description Pin No. Symbol Description 21 REF SW-REG reference setting pin 25 A3 Drive output 3 22 CS1 Current det. pin 1 26 A2 Drive output 2 23 N.C. N.C. 27 A1 Drive output 1 24 N.C. N.C. 28 PG Power GND pin ■ Absolute Maximum Ratings Parameter Supply voltage Symbol Rating Unit VCC 7.0 V VM 14.4 VREG Control signal input voltage *4 V(n) 0 to VCC V ICC 30 mA IO(n) ±1 200 mA IHB 50 mA PD 667 mW Topr −20 to +70 °C Tstg −55 to +150 °C Supply current Output current *3 Hall bias current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 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. *3: n = 22, 25, 26, 27, 28 *4: n = 1, 2, 3, 4, 5, 6, 8, 10, 11 ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 4.25 to 5.5 V VM 4.5 to 14 VREG ■ Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Overall Circuit current 1 ICC1 VCC = 5 V in power save mode 0 0.1 mA Circuit current 2 ICC2 VCC = 5 V, IO = 0 mA 8 16 mA Start/stop Start voltage VSTART Voltage with which a circuit operates at VCC = 5 V and L → H 3.5 V Stop voltage VSTOP Voltage with which a circuit becomes off at VCC = 5 V and H → L 1.0 V 3 AN8481SB ICs for Motor ■ Electrical Characteristics at Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit Hall bias VHB VCC = 5 V, IHB = 20 mA 0.7 1.2 1.6 V IBH VCC = 5 V 1 5 µA In-phase input voltage range VHBR VCC = 5 V 1.5 4.0 V Minimum input level VINH VCC = 5 V 60 mV[p-p] EC VCC = 5 V 1 3.9 V Offset voltage ECOF VCC = 5 V −150 0 150 mV Dead zone ECDZ VCC = 5 V 50 100 150 mV Input current ECIN VCC = 5 V, EC = ECR = 2.5 V −5 −1 µA Input/output gain ACS VDD = 5 V, RCS = 0.5 Ω 0.31 0.41 0.51 A/V High-level output saturation voltage VOH VCC = 5 V, IO = −300 mA 0.9 1.6 V Low-level output saturation voltage VOL VCC = 5 V, IO = 300 mA 0.2 0.6 V Torque limit current ITL VCC = 5 V, RCS = 0.5 Ω 390 530 670 mA FG output high-level FGH VCC = 5 V, IFG = − 0.01 mA 3.0 VCC V FG output low-level FGL VCC = 5 V, IFG = 0.01 mA 0.5 V In-phase input voltage range VFGR VCC = 5 V, Input D-range at H2+, H2− 1.5 3.0 V FG hysteresis width HFG VCC = 5 V 1 10 20 mV Charging current ICH VCC = 5 V, FC = 0.5 V −100 −50 −25 µA Discharging current IDCH VCC = 5 V, FC = 2.5 V 25 50 100 µA GV1 VCC = 5 V 5 10 20 times ISWB VCC = 5 V 10 50 mA Hall bias voltage Hall amplifier Input bias current Torque command In-phase input voltage range Output FG Triangular wave oscillation circuit Lower side voltage detection circuit Input to output gain SW-REG driving circuit PNP driving current • 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 4 Thermal protection operating temperature TSDON VCC = 5 V, ∆EC = 100 mV 170 °C Thermal protection hysteresis width ∆TSD VCC = 5 V, ∆EC = 100 mV 45 °C ICs for Motor AN8481SB ■ Usage Notes 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).) ■ Application Notes • PD Ta curves of HSOP042-P-0400 PD T a 2 400 2 232 2 200 Mounted on standard board (glass epoxy: 75 × 75 × t1.6 mm3) Rth(j-a) = 56°C/W PD = 2 232 mW (25°C) Power dissipation PD (mW) 2 000 1 800 1 600 1 400 1 200 1 042 1 000 800 Independent IC without a heat sink Rth( j-a) = 120°C/W PD = 1 042 mW (25°C) 600 400 200 0 0 25 50 75 100 125 150 Ambient temperature Ta (°C) • Phase conditions between Hall input and output current H3 H1 Phase of Hall pin H1+ H2+ H3+ A H M L B H L M C M L H D L M H E L H M F M H L H2 H1 H2 H3 0 ECR EC A3 A2 A1 A2 A3 A1 0 Emit Output current 0 Sink A B C D E F 5 AN8481SB ICs for Motor ■ Application Circuit Example 0.1 µF 28 PG 9 FG 25 A3 26 A2 27 A1 20 VM 22 CS1 RCS = 0.5 Ω 100 µF FG comparator 68 µH REF 21 19 VREG PCS Lower side VCE detection Amp. Upper side distribution 13 VCC VCC = 5V VTL Lower side distribution 1 µF 18 SWB 17 200 Ω 12 PCI Direction changeover Direction detection SWG 16 0.1 µF Absolute value Amp. 1 kΩ 12 V Thermal protection circuit Amp. ER Logic EP = ER × EA Start/stop Detection Triangular wave Hall bias 8 S/S System control High: Start EA Hall amp. matrix 6 10 ECR EC 11 Servo-torque command VH 7 H3− 6 H3+ 5 H2− 4 H2+ 3 H1− 2 H1+ 1 2 700 pF 15 FC GND 14