Ordering number : EN5792 Monolithic Digital IC LB1991V Three-Phase Brushless Motor Driver for Portable VCR Capstan Motors Overview The LB1991V is a 3-phase brushless motor driver IC that is optimal for driving the capstan motor in portable VCR products. • Speed control technique based on motor voltage and current control. • Built-in FG comparators • Built-in thermal shutdown circuit Functions Package Dimensions • 3-phase full-wave voltage drive technique (120° voltage-linear technique) • Torque ripple correction circuit (overlap correction) unit: mm 3175A-SSOP24 Allowable power dissipation, Pd max — W [LB1991V] SANYO: SSOP24 Ambient temperature, Ta — °C Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC1 max 10 V VCC2 max 11 V VS max 11 V Applied output voltage VO max VS + 2 V Maximum output current IO max 1.0 A Allowable power dissipation Pd max 440 mW Maximum supply voltage Independent IC Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Symbol VCC1 Supply voltage VCC2 Hall input amplitude VHALL Conditions VCC1 ≤ VCC2 VS Between Hall effect element inputs 2.7 to 6.0 V 3.5 to 9.0 V Up to VCC2 V ±20 to ±80 mVp-p SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 53098RM (OT) No. 5792-1/7 LB1991V Electrical Characteristics at Ta = 25°C, VCC1 = 3 V, VCC2 = 4.75 V, VS = 1.5 V Parameter Symbol Conditions Ratings min typ Unit max [Supply Current] VCC1 current drain ICC1 IOUT = 100 mA 3 5 mA VCC2 current drain ICC2 IOUT = 100 mA 7.0 10.0 mA 1.5 3.0 mA 100 µA 75 100 µA VCC1 quiescent current ICC1Q VSTBY = 0 V VCC2 quiescent current ICC2Q VSTBY = 0 V ISQ VSTBY = 0 V VS quiescent current [VX1] High side residual voltage VXH1 IOUT = 0.2 A 0.15 0.22 0.29 V Low side residual voltage VXL1 IOUT = 0.2 A 0.15 0.20 0.25 V V [VX2] High side residual voltage VXH2 IOUT = 0.5 A 0.25 0.40 Low side residual voltage VXL2 IOUT = 0.5 A 0.25 0.40 V Output saturation voltage VO(sat) 1.4 V 87 % +8 % mV Overlap High/low overlap difference O.L ∆O.L IOUT = 0.8 A, Sink + Source RL = 39 Ω × 3, Rangle = 20 kΩ *2 73 (Average high side overlap) – (Average low side overlap) *2 –8 80 [Hall Amplifiers] Input offset voltage VHOFF *1 –5 +5 Common-mode input voltage range VHCM Rangle = 20 kΩ 0.95 2.1 V I/O voltage gain VGVH Rangle = 20 kΩ 25.5 31.5 dB 28.5 [Standby Pin] High-level voltage VSTH Low-level voltage VSTL Input current ISTIN VSTBY = 3 V Leakage current ISTLK VSTBY = 0 V 2.5 V 25 0.4 V 40 µA –30 µA [FRC Pin] High-level voltage VFRCH Low-level voltage VFRCL Input current IFRCIN VFRC = 3 V Leakage current IFRCLK VFRC = 0 V Hall supply voltage VHALL IH = 5 mA, VH(+) – VH(–) 0.85 (–) pin voltage VH(–) IH = 5 mA 0.81 2.5 V 0.4 V 30 µA –30 µA 0.95 1.05 V 0.88 0.95 V 20 [VH] [FG Comparator] Input offset voltage Input bias voltage VFGOFF –3 +3 mV IbFG VFGIN+ = VFGIN– = 1.5 V Input bias current offset ∆IbFG VFGIN+ = VFGIN– = 1.5 V Common-mode input voltage range VFGCM Output high-level voltage VFGOH At the internal pull-up resistors Output low-level voltage VFGOL At the internal pull-up resistors Voltage gain VGFG *1 Output current (sink) IFGOS For the output pin low level TSD operating temperature T-TSD Design target value *1 180 °C TSD temperature hysteresis ∆TSD Design target value *1 20 °C 500 nA –100 +100 nA 1.2 2.5 2.8 V V 0.2 100 V dB 5 mA [TSD] Notes: 1. Items specified as design target values in the conditions column are not tested. 2. The standard for overlap is the value as measured. No. 5792-2/7 LB1991V Pin Assignment Truth Table Source phase → Sink phase 1 2 3 4 5 6 V→W W→V U→W W→U U→V V→U W→V V→W W→U U→W V→U U→V Hall input H H H L L L H L L L H H FRC L L H H H L H L H L H L H L H L H L Note: The “H” entries in the FRC column indicate a voltage of 2.50 V or higher, and the “L” entries indicate a voltage of 0.4 V or lower. (When VCC1 is 3 V.) At the Hall inputs, for each phase a high-level input is the state where the (+) input is 0.02 V or higher than the (–) input. Similarly, a low-level input is the state where the (+) input is 0.02 V or lower than the (–) input. No. 5792-3/7 LB1991V Pin Functions Pin No. Pin Equivalent circuit 1 VCC1 Supply voltage for all circuits other than the IC internal output block and the amplitude control block. 2 VCC2 Supply voltage for the IC internal output control block and the amplitude control block. 3 VS Motor drive power supply. The voltage applied to this pin must not exceed VCC2. 5 UOUT U phase output 7 VOUT V phase output (These outputs include built-in spark killer diodes.) 9 WOUT W phase output 6, 8 Rf 10 VH+ Pin function Ground for the output power transistors Hall element bias voltage supply A voltage that is typically 0.95 V is generated between the VH + and VH– pins. (When IH is 5 mA.) 11 VH– 13 GND 14 FRC Forward/reverse selection. Applications can select motor forward or reverse direction rotation using this pin. (This pin has hysteresis characteristics.) 15 STBY Selects the bias supply for all circuits other than the FG comparators. The bias supply is cut when this pin is set to the low level. 16 UIN1 17 UIN2 18 VIN1 19 VIN2 20 WIN1 21 WIN2 12 ANGLE Hall input/output gain control. The gain is controlled by the resistor connected between this pin and ground. 22 FGIN+ FG comparator noninverting inputs. There is no internally applied bias. 23 FGIN– FG comparator inverting inputs. There is no internally applied bias. 24 FGOUT FG comparator outputs. There is an internal 20-kΩ resistor load. Ground for circuits other than the output transistor The Rf pin potential is the lowest output transistor potential. U phase Hall element input The logic high level is the state where the IN+ voltage is greater than the IN- voltage. V phase Hall element input The logic high level is the state where the IN+ voltage is greater than the IN- voltage. W phase Hall element input The logic high level is the state where the IN+ voltage is greater than the IN- voltage. No. 5792-4/7 Hall amplifiers Forward/re verse switching Power to shaded blocks is supplied from VCC2. Upper and lower amplitude limiters current distribution FG amplifier Hall power-supply voltage output circuit Bias supply 1.2-V reference voltage and bias startup circuit LB1991V Block Diagram Drive signal current generation block Synthesized signal level shifters Hall input synthesis (matrix) No. 5792-5/7 LB1991V Overlap Generation and Calculation Method High side residual voltage High side clamp potential Absolute voltage Electrical angle Calculated center point Low side clamp potential Low side residual voltage Time [Overlap Generation] Since the voltage generated in the amplitude control block is, taking the center point as the reference, 2 × <overlap> × (1/2 VS – VX) on one side, the intersection point of the waveform will be <overlap> × (1/2 VS – VX) from the center point. To clamp that waveform at (1/2 VS – VX) referenced to the center point the overlap must be: A/B × 100 = <overlap> × 100 (%). [Overlap Calculation] • High side overlap (VS – VXH – VXL) (VS – VXH + VXL) Calculated center point: VN = ———————— + VXL = ———————— 2 2 Since A = Vα – VN, B = VS – VXH – VN, the high side overlap will be: A Vα – ((VS – VXH + VXL)/2) <overlap> = — = —————————————— × 100 (%) B VS – VXH – ((VS – VXH + VXL)/2) Which can be calculated as: 2Vα – (VS – VXH) – VXL = ——————————— × 100 (%). (VS – VXH) – VXL • Low side overlap Since C = VN – Vβ, and D = VN – VXL, the low side overlap will be: C ((VS – VXH + VXL)/2) <overlap> = — = ———————————— × 100 D ((VS – VXH + VXL)/2) – VXL Which can be calculated as: (VS – VXH) – VXL –2Vβ = ——————————— × 100 (%). (VS – VXH) – VXL No. 5792-6/7 LB1991V Test Circuit ■ 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 May, 1998. Specifications and information herein are subject to change without notice. PS No. 5792-7/7