Ordering number : EN5503 Monolithic Integrated IC LB1913 FDD Spindle Motor Driver Overview Package Dimensions The LB1913 is a three-phase disk drive motor driver IC that is optimal for use as a 3.5-inch floppy disk drive spindle motor driver. unit: mm 3222-HSOP28 [LB1913] Functions and Features • • • • • • • • Three-phase full-wave linear drive On-chip digital speed control Start and stop circuits (active low) Speed switching High: 300 rpm, Low: 360 rpm Current limiter circuit Index comparator circuit Index delay circuit Thermal protection 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 83196HA (0T) No. 5503-1/6 LB1913 Electrical Characteristics at Ta = 25°C, VCC = 5.0 V Parameter Symbol Current drain SL bias current Conditions ICCO S/S = 5 V (standby mode) ICC S/S = 0 V (normal mode) ISL VSL = 0V Ratings min typ 12 Unit max 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 Hall amplifier input bias current IHB Common-mode input voltage range Vh 1.5 VCC–1.0 Differential-mode input voltage range Vdif 50 200 mVp-p ±10 µA 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 IO = 0.7 A, sink + source V/I converter current ratio DSC buffer input current IDSC FG Schmitt hysteresis ∆Vsh 0.3 V 1.8 V 1.0 mA 0.33 –7 I– I+/I– V/I converter sink current 1.3 0.27 ∆GC I+ Interphase voltage gain difference V/I converter source current 0.8 V V dB ±1 dB 9 14 19 µA –9 –14 –19 µA 0.8 1.0 1.2 1.0 50 * µA mV Number of 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 FG amplifier voltage gain GFG FG amplifier input offset VFGO 1041.5 2.2 FG amplifier internal reference voltage VFGB Schmitt hysteresis ∆VSH * Index input hysteresis ∆VID * Index common-mode input voltage range VID Thermal shutdown circuit operating temperature TSD * ∆TSD * Hysteresis 48 * 2.5 dB 2.8 50 20 1.0 150 V mV mV VCC–1.0 V 180 °C 40 °C Note: * These items are design target values and are not tested. 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 A “high-level” (H) Hall amplifier input means: UIN+ > UIN– VIN+ > VIN– WIN+ > WIN– No. 5503-2/6 LB1913 Pin Assignment Pin Functions Pin no. Pin 18 UIN+ 1.5 V min 19 UIN– VCC–1.0 V max 20 VIN+ 21 VIN– 22 WIN+ 23 WIN– 24 HB 25 FGIN+ 26 FGIN– 27 FGOUT Pin voltage Equivalent circuit Function • U-phase Hall element input • V-phase Hall element input • W-phase Hall element input 0.8 V typ (IH = 5 mA) • Minus-side pin for applying the Hall bias current This pin goes to the open state in the stopped state and the Hall bias is cut off. • FG amplifier plus input A reference voltage of 2.5 V is generated by the IC internally. • FG amplifier minus input • FG amplifier output pin 28 1 I+ I– • Index input Continued on next page No. 5503-3/6 LB1913 Continued from preceding page Pin no. Pin Pin voltage 2 ID Low: 0.4 V max Equivalent circuit Function • Index output High: 4.5 V min 3 CD 4 SS • Connection for external RC time constant circuit. Low: 0.8 V max High: 3.5 V min 5 SL Low: 1.0 V max • Start/stop switching input This is an active-low input. • Speed switching input High: 3.5 V min 6 CLK Low: 1.0 V max High: VCC–1.0 V min 7 GND • Reference clock input Use a clock rate of 1 MHz for 300 and 360 rpm speeds. • Ground connection Connect this pin, pin 14, and the frame to ground. 8 VCC • Power supply Provide a well-stabilized power supply so that ripple and noise do not enter the LB1913 from this pin. 9 Rf • Used for output current detection. The output current is converted to a voltage and detected by connecting a resistor (Rf) between this pin and VCC. The current limiter operates by detecting the voltage on this pin. Continued on next page No. 5503-4/6 LB1913 Continued from preceding page Pin no. Pin 10 DO Pin voltage Equivalent circuit • Speed discriminator Function 11 FC • Frequency characteristics correction Current control system open loop oscillation can be prevented by inserting a capacitor between this pin and ground. 13 UOUT • U-phase output 15 VOUT • V-phase output 16 WOUT • W-phase output 14 PGND • Output transistor ground connection Index Delay Pulse Timing Chart No. 5503-5/6 LB1913 Block Diagram ■ 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 August, 1996. Specifications and information herein are subject to change without notice. No. 5503-6/6