Ordering number : EN5383 Monolithic Digital IC LB1910 FDD Spindle Motor Driver Overview Package Dimensions The LB1910 is a 3-phase disc drive motor driver that is optimal for use as a 3.5-inch FDD spindle motor driver. unit: mm 3222-HSOP28 Functions and Features [LB1910] • • • • Three-phase full-wave linear driver Digital speed control circuit Start and stop circuits (active low) RPM switching H: 300 rpm L: 360 rpm • Current limiter circuit • Built-in index comparator • Thermal shutdown circuit SANYO: HSOP28 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VCC max Maximum output current IO max1 Maximum steady-state output current IO max2 Allowable power dissipation Pd max Conditions Ratings 7.0 t ≤ 0.5 s Independent IC Unit V 1.0 A 0.7 A 0.5 W Operating temperature Topr –20 to +80 °C Storage temperature Tstg –40 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Recommended supply voltage Symbol VCC Conditions 4.2 to 6.5 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 43096HA (OT) No. 5383-1/7 LB1910 Electrical Characteristics at Ta = 25°C, VCC = 5 V Parameter Current drain SL bias current Symbol ICCO Conditions min typ S/S = 5 V (standby) ICC S/S = 0 V (steady state) ISL VSL = 0 V 12 max Unit 10 µA 18 mA 10 µA SL input low-level voltage VSLL 0 1.0 V SL input high-level voltage VSLH 3.5 VCC V 270 µA V S/S bias current IS/S 180 S/S low-level voltage VS/SL 0 0.8 S/S high-level voltage VS/SH 3.5 VCC V 10 µA VCC – 1.0 V Hall amplifier input bias current IHB Common-mode input voltage range Vh 1.5 Differential input voltage range Vdif Hall bias output voltage VH IH = 5 mA Leakage current IHL S/S = 5 V Output saturation voltage Vsat Output leakage current IOL Current limiter Vlim Control amplifier voltage gain GC Voltage gain difference between phases 50 200 mVp-p ±10 µA 0.8 IO = 0.7 A, sink + source 1.3 0.27 0.3 V 1.8 V 1.0 mA 0.33 –7 ∆GC V dB ±1 dB V/I conversion source current I+ 9 14 19 µA V/I conversion sink current I– –9 –14 –19 µA V/I conversion current ratio I+/I– 0.8 1.0 1.2 DSC buffer input current IDSC FG Schmitt hysteresis ∆Vsh 1.0 50 * µA mV Speed discriminator counts N Discriminator operating frequency FD * 1.1 MHz Oscillator frequency range FOSC * 1.1 MHz Index output low-level voltage VIDL IO = 2 mA 0.4 V Index output leakage current IIDL ±10 µA ±10 mV 2.8 V FG amplifier voltage gain GFG FG amplifier input offset VFG O FG amplifier internal reference voltage VFG B Thermal shutdown temperature Hysteresis 1041.5 48 * TSD * ∆TSD * dB 2.2 2.5 150 180 °C 40 °C Note: * Items marked with an asterisk are design target values and are not measured. No. 5383-2/7 LB1910 Pin Assignment Truth Table Source → sink Hall input U V W 1 V phase → W phase H H L 2 V phase → U phase L H L 3 W phase → U phase L H H 4 W phase → V phase L L H 5 U phase → V phase H L H 6 U phase → W phase H L L Note: Hall input high levels are defined as: UIN+ > UIN– VIN+ > VIN– WIN+ > WIN– No. 5383-3/7 LB1910 Block Diagram No. 5383-4/7 LB1910 Pin Functions Pin No. Symbol 18 19 UIN+ UIN– 20 21 VIN+ VIN– 22 23 WIN+ Pin voltage Equivalent circuit diagram Function U phase Hall element input 1.5 V min VCC – 1.0 V max V phase Hall element input W phase Hall element input WIN– 0.8 V typ (IH = 5 mA) Minus side connection for providing the Hall bias current This pin becomes open in the stopped state, thus cutting the Hall bias current. 24 HB 25 FGIN+ 26 FGIN– • FG amplifier minus input 27 FGOUT • FG amplifier output 28 1 I+ I– Index input 2 ID 2.5 V L: 0.4 V max H: 4.5 V min • FG amplifier plus input A 2.5-V reference voltage is generated internally. Index output Continued on next page. No. 5383-5/7 LB1910 Continued from preceding page. Pin No. Symbol Pin voltage Equivalent circuit diagram Function 4 SS L: 0.8 V max H: 3.5 V min Start/stop mode switching This is an active-low input. 5 SL L: 1.0 V max H: 3.5 V min Rotational speed switching 6 CLK L: 1.0 V max H: VCC – 1.0 V min Reference clock input A 1-MHz input frequency corresponds to speeds of 300 and 360 rpm. 7 GND • Ground • This pin, pin 14, and the frame must all be grounded together. 8 VCC Power supply This voltage must be stabilized so that ripple and noise do not enter the IC. 9 Rf Output current detection The output current is detected as a voltage by connecting the resistor Rf between this pin and VCC. The current limiter operates by detecting the voltage on this pin. 10 DO Speed discriminator 11 FC Frequency characteristics compensation Current control system loop oscillation is prevented by connecting a capacitor between this pin and ground. Continued on next page. No. 5383-6/7 LB1910 Continued from preceding page. Pin No. Symbol Pin voltage Equivalent circuit diagram Function 13 UOUT U phase output 15 VOUT V phase output 16 WOUT W phase output 14 PGND Output transistor ground connection Index Pulse Timing Chart ■ 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: ➀ 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: ➁ 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. 5383-7/7