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参数资料
| 型号： | L6232E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3.5 A, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 6/10页 |
| 文件大小： | 114K |
| 代理商： | L6232E |
FUNCTIONAL DESCRIPTION (Refer to the
Block Diagram)
The commutation sequence is provided by the
user via six inputs. INUA,INUB,INUC turn on the
three upper DMOS drivers when held at logic
LOW, and inputs INLA,INLB,INLC turn on the
three lower DMOS drivers when held at logic
HIGH.
The BRK and BRK DLY inputs offer flexibility to
the system designer in the implementation of the
braking function. The BRK logic input, when
pulled low will turn-off all upper and lower Dmos
drivers. The low transition at BRK will produce a
delayed negative transition at the BRK DLY input,
configurable by connection of a capacitor Cd and
a resistor Rd from the BRK DLY pin to ground.
The negative transition at BRK DLY will initiate
the braking of the motor by turning on all lower
Dmos, while keeping all upper DMOS turned-off.
This feature provides a time interval where the
motor BEMF can be used to power the head
parking function before the braking procedure is
iniziated. External detection of the supply(VP)
drop-off is necessary to provide the appropriate
logic signal to the BRK input. (see Fig. 1)
The brake function utilizes the energy stored in
the central charge pump capacitor (Cp) to turn-on
or turn-off the DMOS drivers.
This allows for
completion of the braking procedure after the VP
supply has powered down.
The L6232E is capable of driving the motor in
either pulse width modulation (PWM) or linear
(LIN) mode. The driving mode is determined by
the smaller of two analog voltages inputs, LIN
Vref and PWM Vref. The motor current is control-
led by LIN Vref and PWM Vref and the current
sense resistor Rs connected to the SENSE out-
put. The SENSE output provides for connection of
a resistor in series with the source of all lower
DMOS drivers. The voltage at this pin provides
the error signal wich is utilized internally to regu-
late the motor current Im. The current in both
PWM and linear mode is determined by the ex-
pression :
Im
=
Vref
GV
RS
in wich Gv is the voltage gain of the sense ampli-
fier. In linear mode, the current is regulated by a
linear control loop wich drives the lower DMOS.
Compensation of the linear control loop is
achieved by connection of a series network
(Rc,Cc) from the transconductance amplifier out-
put (Gm) and ground. Control is passed to each
lower DMOS in succession during the commuta-
tion sequence(MPX).
The rate at which the upper and lower drivers
turns-off during linear mode operation is configur-
able externally by the value of the resistor R used
at the RC pin. This defines a current which is util-
ized internally to limit the voltage slew-rate at the
outputs during transitions. The output slew-rate is
internally adjusted for fast slewing during PWM
operation to reduce losses, and a relatively
slower rate during linear mode operation to mini-
Figure 1: Brake Delay and Braking timing of the L6232E. At the time t1 a VP Powerdown threshold
detector drives low the BRK input; at time t2 the Charge Pump voltage becomes inadequate
to maintain ON the lower DMOS.
L6232E
5/10
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