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TA8493F/AF/BF
Toshiba Bipolar Linear Integrated Circuit Multi-Chip
TA8493F, TA8493AF, TA8493BF
3-Phase Full Wave Brushless DC Motor Driver IC for CD-ROM Drives
These 3-phase, full-wave, brushless DC motor driver ICs have been developed for use in CD-ROM drive spindle motors. The TA8493F/ AF/ BF contain in its upper stage a discrete power transistor (P-ch-MOS) and uses direct PWM control system, which enables the IC to provide superior thermal efficiency. Furthermore, the multi-chip structure of this device facilitates dispersion of the heat generated inside the package, making it possible to suppress heat concentration.
Features
· · · · · · · · · Multi-chip structure (3 × 2SJ465 chips built-in) Direct PWM control system Drive system: 120°drive system (TA8493F/BF) : 180°drive system (TA8493AF) Built-in current limiter: ILIM = 0.7 A (typ.) (at RF = 0.33 Ω) Built-in reversing brake/short brake functions FG signal output (using hall element output signal) Built-in hall bias Built-in thermal shutdown circuit Package: MFP-30 Weight: 0.63 g (typ.)
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TA8493F/AF/BF
Block Diagram
VCC
5V La (G) 20 VCC 2 Lb (G) 1 Lc (G) 27 29 Amplifier 4 VM1 12 V
Ha
+ -
15 14 Matrix 13
Ha
+ Hb 12 Hb 16 + Hc - 17 Hc
VM2
3 30 28
La Lb Lc RF1 RF2
Reverse Detection
TSD 6 25 GND
FGO 10 HB 18 PWM Signal VC 21 Vref 22 F/F OSC Mode Select MS 26 OSC 23 Short Brake BRK 11 24 GND1 7 GND2 2SJ465 ´ 3 9 pin: N.C. Stand by 19 Cd 5 SB 8 CRF
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TA8493F/AF/BF
PIN Assignment
Terminal No. 1 2 3 4 5 Terminal Symbol Lb (G) La (G) La VM2 SB Function b-phase upper side power transistor (base) output terminal a-phase upper side power transistor (base) output terminal a-phase output terminal Supply voltage terminal for motor drive RUN/STOP control terminal Keep open. Keep open. Connect to the coil. Connect to VM1 externally. H: RUN, L: STOP Sets limiter current value. 6 RF1 GND2 CRF N.C. FGO BRK
Hb + Hb Ha + Ha + Hc Hc
Remarks
Output current detection terminal
Connect to RF2 externally and between this terminal and GND. ¾ Connect a capacitor between this terminal and GND.
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
GND Output current filter terminal
FG amplifier output terminal Brake mode select terminal b-phase negative hall signal input terminal b-phase positive hall signal input terminal a-phase negative hall signal input terminal a-phase positive hall signal input terminal c-phase positive hall signal input terminal a-phase negative hall signal input terminal Hall element bias terminal Forward/reverse changeover gain adjustment terminal Supply voltage terminal for control circuits Control amplifier input terminal Control amplifier reference voltage input terminal Triangular wave oscillation terminal GND
Outputs a signal whose frequency is determined by the CD rotation frequency. Output mode when VC > Vref Connect to hall element output terminal. Connect to hall element output terminal. Connect to hall element output terminal. Connect to hall element output terminal. Connect to hall element output terminal. Connect to hall element output terminal. Open collector output. Connect to the negative side of hall element bias line. Adjust a rotation direction changeover gain VCC (opr) = 4.5 to 5.5 V Use the control signal as input. Use the reference voltage for the control amplifier as input. Connect a capacitor between this terminal and GND. ¾ Sets limiter current value.
HB Cd VCC VC Vref OSC GND1
25
RF2 MS Lc (G) Lc VM1 Lb
Output current detection terminal
Connect to RF1 externally and between this terminal and GND. Determines output mode. Keep open. Connect to the coil. Connect to VM2 externally. Connect to the coil.
26 27 28 29 30
Mode select terminal c-phase upper side power transistor (base) output terminal c-phase output terminal Supply voltage terminal for motor drive b-phase output terminal
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TA8493F/AF/BF
Absolute Maximum Ratings (Ta = 25°C)
Characteristics Power Supply Voltage Output Current Power Dissipation Junction Temperature Operating Temperature Storage Temperature Symbol VCC VM IO PD (Note1) Tj Topr Tstg 150 -20 to 75 -55 to 150 °C °C °C Rating 7 16 1.5 1.0 A W Unit V
Note1: unmounted
Operating Voltage Range
Characteristics Power Supply Voltage Symbol VCC VM Operating Range 4.5 to 5.5 10 to 14 Unit V
Electrical Characteristics (VCC = 5 V, VM = 12 V, Ta = 25°C)
Characteristics Supply Voltage Input Current Hall Amp. Common Mode Input Voltage Range Input Amplitude Hall Element Bias Saturation Voltage Common Mode Input Voltage Range Input Current Control Amp. Dead Zone Voltage Width Symbol ICC1 ICC2 IINH VCMRH VH VHB VCMRC 2 IINC VDZ DVOFF (F) 2 DVOFF (R) ILIM VLIM Input Voltage (H) RUN/STOP Control Circuit Input Voltage (L) Input Current VINS (H) VINS (L) IINS (L) 1 ¾ 3 (RUN) (STOP) VINS = GND, (source current) ¾ VC = Vref = 1.65 V, (source current) Vref = 1.65 V, RF = 0.33 W (Note2) CW mode, Vref = 1.65 V, RF = 0.33 W CCW mode, Vref = 1.65 V, RF = 0.33 W RF = 0.33 W ¾ (No.