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| 型号： | A3953SLBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/12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
During braking, when the MODE input is high, the peak current
limit can be approximated by:
Full-Bridge PWM Motor Driver
The comparator output is blanked to prevent false over-current
detections due to reverse recovery currents of the clamp diodes,
I TRIP BRAKE MH
≈
V REF
R S
and/or switching transients related to distributed capacitance in
the load.
During internal PWM operation, at the end of the t OFF time, the
CAUTION: Because the kinetic energy stored in the motor
and load inertia is being converted into current, which charges
the V BB supply bulk capacitance (power supply output and
decoupling capacitance), care must be taken to ensure the
capacitance is sufficient to absorb the energy without exceeding
the voltage rating of any devices connected to the motor supply.
Brake Operation - MODE Input Low. During braking,
with the MODE input low, the internal current-control circuitry
is disabled. Therefore, care should be taken to ensure that the
motor ’s current does not exceed the ratings of the device. The
braking current can be measured by using an oscilloscope with
a current probe connected to one of the motor ’s leads, or if the
back-EMF voltage of the motor is known, approximated by:
V BEMF – 1V
I PEAK BRAKE ML ≈
R LOAD
RC Fixed Off-Time. The internal PWM current-control
circuitry uses a one shot to control the time the driver(s)
remain(s) off. The one-shot time, t OFF (fixed off-time), is
determined by the selection of an external resistor (R T ) and
capacitor (C T ) connected in parallel from the RC timing terminal
to ground. The fixed off-time, over a range of values of C T = 470
pF to 1500 pF and R T = 12 k Ω to 100 k Ω , is approximated by:
t OFF ≈ R T x C T
The operation of the circuit is as follows: when the PWM latch is
reset by the current comparator, the voltage on the RC terminal
will begin to decay from approximately 0.60V CC . When the
voltage on the RC terminal reaches approximately 0.22V CC , the
PWM latch is set, thereby enabling the driver(s).
RC Blanking. In addition to determining the fixed off-time of
the PWM control circuit, the C T component sets the comparator
blanking time. This function blanks the output of the comparator
when the outputs are switched by the internal current-control
circuitry (or by the PHASE, BRAKE, or ENABLE inputs).
comparator ’s output is blanked and C T begins to be charged
from approximately 0.22V CC by an internal current source of
approximately 1 mA. The comparator output remains blanked
until the voltage on C T reaches approximately 0.60V CC .
When a transition of the PHASE input occurs, C T is discharged
to near ground during the crossover delay time (the crossover
delay time is present to prevent simultaneous conduction of
the source and sink drivers). After the crossover delay, C T is
charged by an internal current source of approximately 1 mA.
The comparator output remains blanked until the voltage on C T
reaches approximately 0.60V CC .
When the device is disabled, via the ENABLE input, C T is
discharged to near ground. When the device is re-enabled, C T is
charged by an internal current source of approximately 1 mA.
The comparator output remains blanked until the voltage on C T
reaches approximately 0.60V CC .
For 3.3 V operation, the minimum recommended value
for C T is 680 pF ± 5 %. For 5.0 V operation, the minimum
recommended value for C T is 470 pF ± 5%. These values
ensure that the blanking time is sufficient to avoid false trips
of the comparator under normal operating conditions. For
optimal regulation of the load current, the above values for C T
are recommended and the value of R T can be sized to determine
t OFF . For more information regarding load current regulation, see
below.
LOAD CURRENT REGULATION
WITH INTERNAL PWM
CURRENT-CONTROL CIRCUITRY
When the device is operating in slow current-decay mode,
there is a limit to the lowest level that the PWM current-
control circuitry can regulate load current. The limitation is the
minimum duty cycle, which is a function of the user-selected
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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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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