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| 型号： | A3953SLBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER PWM FULL 16-SOIC |
| 标准包装： | 1 |
| 应用： | PWM 电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±1.3A |
| 电压 - 负载： | 3 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1133-6 |
A3953
Thermal protection circuitry turns off all drivers should the
junction temperature reach 165°C (typical). This is intended
only to protect the device from failures due to excessive junction
temperatures and should not imply that output short circuits
are permitted. The hysteresis of the thermal shutdown circuit is
approximately 15°C.
APPLICATION NOTES
Full-Bridge PWM Motor Driver
for the given level of I LOAD . The value for R θ JT is given in the
package thermal resistance table for the appropriate package.
The power dissipation of the batwing packages can be improved
by 20% to 30% by adding a section of printed circuit board
copper (typically 6 to 18 square centimeters) connected to the
batwing terminals of the device.
The thermal performance in applications that run at high load
need be added. For internal fast-decay PWM, or external PHASE
currents and/or high duty cycles can be improved by adding
Current Sensing. The actual peak load current (I PEAK ) will be external diodes in parallel with the internal diodes. In internal
above the calculated value of I TRIP due to delays in the turn off of PWM slow-decay applications, only the two ground clamp diodes
the drivers. The amount of overshoot can be approximated by:
(V BB – [(I TRIP x R LOAD ) + V BEMF ]) x t PWM(OFF)
I OS ≈
L LOAD
where V BB is the motor supply voltage, V BEMF is the back-EMF
voltage of the load, R LOAD and L LOAD are the resistance and
inductance of the load respectively, and t PWM(OFF) is specified in
the electrical characteristics table.
The reference terminal has a maximum input bias current of ±5
μ A. This current should be taken into account when determining
the impedance of the external circuit that sets the reference
voltage value.
To minimize current-sensing inaccuracies caused by ground trace
I x R drops, the current-sensing resistor should have a separate
return to the ground terminal of the device. For low-value sense
resistors, the I x R drops in the printed wiring board can be
significant and should be taken into account. The use of sockets
should be avoided as their contact resistance can cause variations
in the effective value of R S .
Generally, larger values of R S reduce the aforementioned effects
but can result in excessive heating and power loss in the sense
resistor. The selected value of R S should not cause the absolute
maximum voltage rating of 1.0 V (0.4 V for V CC = 3.3 V
operation), for the SENSE terminal, to be exceeded.
or ENABLE input PWM applications, all four external diodes
should be added for maximum junction temperature reduction.
PCB Layout. The load supply terminal, V BB , should
be decoupled with an electrolytic capacitor (>47 μ F is
recommended) placed as close to the device as is physically
practical. To minimize the effect of system ground I x R drops on
the logic and reference input signals, the system ground should
have a low-resistance return to the motor supply voltage. See also
the Current Sensing and Thermal Considerations sections, above.
Fixed Off-Time Selection. With increasing values of t OFF,
switching losses will decrease, low-level load-current regulation
will improve, EMI will be reduced, the PWM frequency will
decrease, and ripple current will increase. The value of t OFF can
be chosen for optimization of these parameters. For applications
where audible noise is a concern, typical values of t OFF are chosen
to be in the range of 15 ms to 35 ms.
Stepper Motor Applications. The MODE terminal
can be used to optimize the performance of the device in
microstepping/sinusoidal stepper-motor drive applications. When
the load current is increasing, slow decay mode is used to limit
the switching losses in the device and iron losses in the motor.
This also improves the maximum rate at which the load current
can increase (as compared to fast decay) due to the slow rate of
decay during t OFF . When the load current is decreasing, fast-decay
allowing the device to be used in microstepping, sinusoidal, and
other varying current-profile applications.
recommended that the maximum junction temperature be kept
best by attaching a thermocouple to the power tab/batwing of the
The current-sensing comparator functions down to ground
mode is used to regulate the load current to the desired level. This
prevents tailing of the current profile caused by the back-EMF
voltage of the stepper motor.
Thermal Considerations. For reliable operation it is
In stepper-motor applications applying a constant current to
below 110°C to 125°C. The junction temperature can be measured the load, slow-decay mode PWM is typically used to limit the
switching losses in the device and iron losses in the motor.
device and measuring the tab temperature, T TAB . The junction
temperature can then be approximated by using the formula:
T J ≈ T TAB + (I LOAD x 2 x V F x R ? JT )
where V F may be chosen from the electrical specification table
DC Motor Applications . In closed-loop systems, the
speed of a dc motor can be controlled by PWM of the PHASE
or ENABLE inputs, or by varying the reference input voltage
(REF). In digital systems (microprocessor controlled), PWM of
the PHASE or ENABLE input is used typically thus avoiding
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
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| A3955SB | 功能描述:IC MOTOR DRIVER PWM FULL 16-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3955SB-T | 功能描述:IC MOTOR DRIVER PWM FULL 16-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
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