tb6549p TOSHIBA Semiconductor CORPORATION, tb6549p Datasheet - Page 6

• Manufacturer Part Number: tb6549p
• Description: Full-bridge Driver Ic For Dc Motors
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Component Description
Input/Output Function
1. Control Input/PWM Input Circuit
IN1
H/L
H
H
L
L
•
•
•
The input signals are shown below. Input at the CMOS and TTL levels can be provided. Note that the
input signals have a hysteresis of 0.2 V (typ.).
The PWM input frequency should be 100 kHz or less.
PWM control function
Motor speed can be controlled by inputting the 0/5-V PWM signal to the PWM pin.
When PWM control is provided, normal operation and short brake operation are repeated.
If the upper and lower power transistors in the output circuit were ON at the same time, a penetrating
current would be produced. To prevent this current from being produced, a dead time of 300 ns (design
target value) is provided in the IC when either of the transistors changes from ON to OFF, or vice versa.
Therefore, PWM control by synchronous rectification is enabled without an OFF time being inserted by
external input. Note that a dead time is also provided in the IC at the time of transition between CW
and CCW or between CW (CCW) and short brake mode, thereby eliminating the need for an OFF time.
IN2
H/L
V
V
H
H
L
L
INH
INL
Input
: GND to 0.8 V
: 2 to V
SB
H
H
H
H
L
(IN2, PWM)
reg
V
IN1
PWM
H
H
H
H
H
L
L
L
L
L
V
DD
OUT1
H
L
L
L
L
(high impedance)
(high impedance)
100 kΩ
OFF
OFF
6
OUT2
H
L
L
L
L
V
DD
Output
TB6549F/FG/P/PG/HQ
Short brake
Short brake
Short brake
CW/CCW
CCW/CW
Standby
Mode
Stop
2007-3-6