ICs for Compact Disc/CD-ROM Player AN8480NSB 3-phase full-wave motor driver IC ■ Overview Unit: mm 18.4±0.2 The AN8480NSB is a 3-phase full-wave motor driver IC with a reverse rotation brake/short brake changeover function, incorporating a thermal protection circuit with its protection monitor pin. (5.15) (4.8) 28 22 15 21 • 3-phase full-wave and snubberless • FG output • Current limit • Reverse rotation prevention • Thermal protection circuit built-in (with thermal protection monitor pin) +0.10 0.30 –0.05 8.3±0.2 ■ Features 10.93±0.30 (1.315) 0° to 10° 1 7 8 14 (1.2) 0.8 ■ Applications +0.10 0.35 –0.05 (6.4) Seating plane 0.1±0.1 2.7±0.2 0.65±0.20 HSOP042-P-0400 • Various types of optical disk drive 15 SG ■ Block Diagram 21 Detection Hall bias 26 ER Logic A2 A3 EP = ER × ΕΑ 1 EA Absolute value 17 12 FG FG comparator VTL Thermal protection circuit Start/stop PG Brake circuit TSDF 18 A1 11 ECR 27 13 EC 7 28 Amp. Direction detection 9 CS1 Amp. BRK VH 8 20 H3− Lower side distribution PCI H3+ 6 VM Direction changeover Hall amp. matrix 16 H2− 5 VCC H2+ Upper side distribution 3 10 H1− 22 S/S H1+ 2 1 AN8480NSB ICs for Compact Disc/CD-ROM Player ■ Pin Descriptions Pin No. Symbol Description Pin No. Symbol Description 1 PG Power GND pin 15 SG Signal GND pin 2 H1+ Hall element-1 positive input pin 16 VCC Supply voltage pin 3 H1− Hall element-1 negative input pin 17 ECR Torque command reference input pin 4 N.C. N.C. 18 EC 5 H2+ Hall element-2 positive input pin 19 N.C. N.C. 6 H2− Hall element-2 negative input pin 20 PCI Current feedback phase compensation pin 7 VH Hall bias pin 21 VM Motor supply voltage pin 8 H3+ Hall element-3 positive input pin 22 CS Current det. pin 1 9 H3− Hall element-3 negative input pin 23 N.C. N.C. 10 SS Start/stop changeover pin 24 N.C. N.C. 11 TFLG Thermal protection monitor pin 25 N.C. N.C. 12 FG FG signal output pin 26 A3 Drive output 3 13 BRK Brake mode setting pin 27 A2 Drive output 2 14 N.C. N.C. 28 A1 Drive output 1 Torque command input pin ■ Absolute Maximum Ratings Parameter Supply voltage Control signal input voltage *4 Symbol Rating Unit VCC 7.0 V VM 14.4 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 = 1, 22, 26, 27, 28 *4: n = 2, 3, 5, 6, 8, 9, 10, 13, 17, 18 ■ Recommended Operating Range Parameter Supply voltage 2 Symbol Range Unit VCC 4.25 to 5.5 V VM 4.5 to 14 ICs for Compact Disc/CD-ROM Player AN8480NSB ■ 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 1 8 16 mA Start/stop Start voltage VSTART Voltage with which a circuit operates at VCC = 5 V and L → H 2.7 V Stop voltage VSTOP Voltage with which a circuit becomes off at VCC = 5 V and H → L 0.7 V Medium voltage VMED Voltage with which VPC1 becomes low at VCC = 5 V and EC = 0 V 1.55 1.75 V 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 0.5 3.9 V Offset voltage ECOF VCC = 5 V −100 0 100 mV Dead zone ECDZ VCC = 5 V 25 75 125 mV Input current ECIN VCC = 5 V, EC = ECR = 1.65 V −5 −1 µA Input/output gain ACS VCC = 5 V, RCS = 0.5 Ω 0.75 1.0 1.25 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 400 500 600 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 Short brake model level VSBR VCC = 5 V 1.0 V Reverse rotation brake mode level VRBR VCC = 5 V 3.5 V Short brake start level VSBRL VCC = 5 V, ECR = 1.65 V 1.65 1.74 V 12 35 mA Hall bias Hall bias voltage Hall amplifier Input bias current Torque command In-phase input voltage range Output FG Brake cirrcuit Short brake current ISBR VCC = 5 V 3 AN8480NSB ICs for Compact Disc/CD-ROM Player ■ Electrical Characteristics at Ta = 25°C (continued) • 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 temperature TSDON VCC = 5 V, ∆EC = 100 mV 160 °C Thermal protection hysteresis width ∆TSD VCC = 5 V, ∆EC = 100 mV 45 °C Thermal protection flag Level at thermal protection = on VTSDON VCC = 5 V 0.5 V Level at thermal protection = off VTSDOFF VCC = 5 V 3.0 V ■ Usage Notes Prevent this IC from being line-to-ground fault. (To be concrete, do not short-circuit any of A1 (pin 28), A2 (pin 27) and A3 (pin 26) with VM pin (pin 21).) ■ Application Notes • PD Ta curves of HSOP042-P-0400 PD T a 2.500 2.240 Power dissipation PD (W) 2.000 Mounted on standard board (glass epoxy: 75 × 75 × t1.6 mm3) Rth(j-a) = 55.8°C/W 1.500 1.042 1.000 Independent IC without a heat sink Rth(j-a) = 119.9°C/W 0.500 0.000 0 25 50 75 100 Ambient temperature Ta (°C) 4 125 150 ICs for Compact Disc/CD-ROM Player AN8480NSB ■ Application Notes (continued) • 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 • 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: 1. Let an induced voltage generated in each phase as below: (Reference to a motor center point) EA1 = EO × sin (X) · · · (1) EA2 = 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) IA2 = IO × sin (X+120) · · · (5) IA3 = IO × sin (X+240) · · · (6) 3. The voltages generated by a wire-wound resistance of a motor are: VR2 = IA2 × R · · · (8) VR3 = IA3 × R · · · (9) VR1 = IA1 × R · · · (7) 4. In each phase, add the voltage generated by an induced voltage and that by a wire-wound resistance. VA2' = (2) + (5) VA3' = (3) + (6) VA1' = (1) + (4) 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. VA1 = VA1' − MIN (VA1', VA2', VA3') · · · (10) VA2 = VA2' − MIN (VA1', VA2', VA3') · · · (11) VA3 = VA3' − 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. 3 P = Σ (12 − VAn ) × IAn n=1 5 AN8480NSB ICs for Compact Disc/CD-ROM Player ■ Application Notes (continued) • Theory of thermal resistance A chip temperature or the fin temperature can be understood in the same way as Ohm's Law. Tj Rj-c P Rf Rc-a Ta Tj : Chip temperature Ta : Ambient temperature P : Electric power generated by IC Rj-c : Thermal resistance between a chip and a package Rc-a: Thermal resistance between a package and a surface of a heat sink or free air Rf : Thermal resistance between a package and surface of a heat sink Tj = Ta + P × (Rj-c + Rc-a // Rf) 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 Rf in the above figure. Tj = Ta + P × (Rj-c + Rc-a // Rf) 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. ■ Application Circuit Example 15 SG VM = 12 V 21 VM H1+ 2 Upper side distribution H1− 3 Hall amp. matrix Lower side distribution H3+ 8 27 A2 Direction detection H3− 9 Detection VH 7 Hall bias Servo EC 18 torque command 17 ECR 26 A3 ER Logic EP = ER × EA 1 PG EA Absolute value 12 FG FG comparator VTL Thermal protection circuit VCC = 5 V 13 Brake circuit BRK PCI 20 VCC 16 High: Start Medium: FG is on. Low: Stop S/S 10 Start/stop 6 28 A1 Amp. 0.1 µF 11 H2− 6 Amp. Direction changeover TSDF H2+ 5 22 CS1 RCS = 0.5 Ω Low: TSD on High: TSD off Low: Short brake High: Reverce rotation brake FG signal