ROHM BA6444FP Datasheet
Motor driver ICs
3-phase motor driver
BA6444FP
The BA6444FP is a 3-phase, full-wave, pseudo-linear motor driver suited for VCR capstan motors. The IC has a torque
ripple cancellation circuit to reduce wow and flutter, and a forced brake circuit that allows abrupt change of operational
mode. The output transistor saturation prevention circuit provides superb torque control over a wide range of current.
FG and hysteresis amplifiers are also built in.
Applications
VCR capstan motors, DAT capstan motors
Features
1) 3-phase, full-wave, pseudo-linear drive system.
2) Torque ripple cancellation circuit.
3) Forced brake circuit.
Absolute maximum ratings (Ta = 25C)
4) Output transistor (high- and low-sides) saturation
prevention circuit.
5) FG and hysteresis amplifiers.
6) Thermal shutdown circuit.
Recommended operating conditions
634
Motor driver ICs BA6444FP
Block diagram
635
Motor driver ICs BA6444FP
Pin descriptions
636
Motor driver ICs BA6444FP
Input/output circuits
(1) I/O circuit interface
Resistances, in Ω, are typical values. Note that the resistance values can vary 30%.
1) ED/S pin (2 pin) 2) BRK pin (3 pin)
3) Motor output (A1: 5 pin, A2: 6 pin,
4) E
C and ECR pins (10 pin, 11 pin)
A3: 9 pin)
5) TL pin (12 pin) 6) Hall signal input pins
: 27 pin, H1: 26 pin, H2: 25 pin,
(H1
: 24 pin, H3: 23 pin, H3: 22 pin)
H2
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