TECHNICAL NOTE Motor Driver IC Series for Tape Record System Capstan Motor Driver for High-speed Forwarding and Rewinding VTR BA6878EFV,BA6868FM Description The BA6878EFV and BA6868FM are 3-phase, full-wave motor drivers, each of which is used with three external Hall sensors for rotor position detection. The BA6878EFV incorporates output transistors with saturation prevention circuits, and is driven by linear voltage and pseudo-linear currents. BA6868FM also incorporates a torque ripple canceling circuit, and is driven by pseudo-linear and PWM voltage. Moreover, it can respond to the high-speed operation of the motor and ensures high-precision rotation characteristic performance at low speed. Features 1) 180, 3-phase full-wave pseudo-linear drive system 2) Built-in output saturation prevention circuits (on high and low sides) 3) Selective forward/reverse rotation 4) Built-in FG and hysteresis amplifiers (BA6878EFV only) 5) Built-in current limit and thermal shut down circuits 6) Direct PWM pseudo-linear drive system (BA6868FM only) 7) Built-in torque ripple canceling circuit (BA6868FM only) 8) Built-in Hall sensor bias power supply (BA6868FM only) Applications Non-portable VTR Product line BA6878EFV BA6868FM Power supply voltage for control block 4.55.5V 4.56.0V Power supply voltage for output block 4.522V 4.020.5V Vcc circuit current 7.4mA 11mA Max. output current 1500mA 1800mA Torque reference gain 0.77 A/V 1.07 A/V Current limit voltage 0.5V External setting Hall amplifier input range 1.5Vcc-1.5V 1.5Vcc-1.7V Output drive system Linear voltage and pseudo-linear current PWM voltage and pseudo-linear current Output saturation prevention circuit Yes Yes Torque ripple canceling circuit No Yes Rotation direction change Yes Yes FG signal amplification circuit Amp + hysteresis Comparator built-in No Package HTSSOP-B24 HSOP-M28 Ver.B Oct.2005 Absolute Maximum Ratings BA6878EFV Parameter Symbol Limit Unit Applied voltage Vcc 7 V Applied voltage VM 23 V *1 Power dissipation Pd 1.1 W Operating temperature range Topr -25+75 Storage temperature range Tstg -55+150 *2 Maximum output current Iomax 1500 mA Junction temperature Tjmax +150 *1 Reduced by 8.8mW/C over 25C, when mounted on a PCB (70 mm x 70 mm x 1.6 mm, glass epoxy). *2 Must not exceed Pd or ASO. BA6868FM Parameter Symbol Limit Unit Applied voltage Vcc 7 V Applied voltage VM 22 V *1 Power dissipation Pd 2.20 W Operating temperature range Topr -25+75 Storage temperature range Tstg -55+150 *2 Maximum output current Iomax 1800 mA Junction temperature Tjmax +150 *1 Reduced by 17.6 mW/C over 25C, when mounted on a PCB (70 mm x 70 mm x 1.6 mm, glass epoxy). *2 Must not exceed Pd or ASO. Operating Conditions BA6878EFV Parameter Symbol Limit Unit 4.55.5 Operating power supply voltage range Vcc V 4.522.0 Operating power supply voltage range VM V 1.5Vcc-1.5 Hall amp in-phase input voltage range VPD V BA6868FM Parameter Symbol Limit Unit Operating power supply voltage range Vcc 4.56.0 V 4.520.5 Operating power supply voltage range VM V 1.5Vcc-1.7 Hall amp in-phase input voltage range VPD V 2/16