TA8493AF Toshiba Semiconductor, TA8493AF Datasheet - Page 13

• Manufacturer Part Number: TA8493AF
• Description: (TA8493xx) 3-PHASE FULL WAVE BRUSHLESS DC MOTOR DRIVER IC FOR CD-ROM DRIVES
• Manufacturer: Toshiba Semiconductor

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Output circuit
stage diodes.
efficiency.
Triangular wave oscillator circuit
amp output current.
an oscillation frequency of 20 kHz to 50 kHz.
This circuit uses the system to chop the lower power transistors and resurrect coil current through upper
The upper-stage power transistors consists of Pch-MOS transistors (2SJ465), which give high torque
Note: Lower-stage predrivers of TA8493AF/BF are supplied by V
Triangular waves are generated by connecting a capacitor between the OSC pin and GND.
This circuit is current output type, which makes PWM signal by comparing its output current with control
Taking into account efficiency considerations and the effects of noise, Toshiba recommends using the IC with
f
OSC
[Hz] =
(3.0 - 0.7) [V] ´ C [F]
V
50 ´ 10
La
(upper stage)
- 6
[A]
La
3.0 V
0.7 V
V
R
M
F
13
f
PWM
= 20 k to 50 kHz
*V
CC
(lower stage)
CC
to reduce the power dissipation.
/V
M
(coil current)
V
GND
M
Lower Pw T
Lower Pw T
R
La
F
TA8493F/AF/BF
* V
V
CC
M
r
r
: TA8493AF/BF
: TA8493F
.: ON
.: OFF
2002-01-31