A3953

更新时间： 2024-02-11 07:46:56

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器电机
页数	文件大小	规格书
14页	229K
描述
FULL-BRIDGE PWM MOTOR DRIVER

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A3953 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	LEAD FREE, PLASTIC, MS-013AA, SOIC-16
针数：	16	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.45	Is Samacsys：	N
其他特性：	ALSO REQUIRES 3V TO 50V VBB SUPPLY	模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	10.3 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-20 °C
最大输出电流：	1.3 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	3.3/5 V
认证状态：	Not Qualified	座面最大高度：	2.65 mm
子类别：	Motion Control Electronics	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	3 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	OTHER	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	7.5 mm	Base Number Matches：	1

A3953 数据手册

3953

FULL-BRIDGE

PWM MOTOR DRIVER

LOAD CURRENT REGULATION

WITH INTERNAL PWM

PWM of the PHASE and ENABLE Inputs. The PHASE

and ENABLE inputs can be pulse-width modulated to

regulate load current. Typical propagation delays from

the PHASE and ENABLE inputs to transitions of the

power outputs are specified in the electrical characteris-

tics table. If the internal PWM current control is used, the

comparator blanking function is active during phase and

enable transitions. This eliminates false tripping of the

over-current comparator caused by switching transients

(see “RC Blanking” above).

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 value of t_OFFand the minimum on-time

pulse t_ON(min)max that occurs each time the PWM latch is

reset. If the motor is not rotating (as in the case of a

stepper motor in hold/detent mode, a brush dc motor when

stalled, or at startup), the worst case value of current

regulation can be approximated by:

Enable PWM. With the MODE input low, toggling the

ENABLE input turns on and off the selected source and

sink drivers. The corresponding pair of flyback and

ground-clamp diodes conduct after the drivers are

[(V_BB– V_{SAT(source+sink)}) x t_ON(min)max] – (1.05(V_SAT(sink)+ V_F) x t_OFF

)

disabled, resulting in fast current decay. When

the device is enabled the internal current-control

circuitry will be active and can be used to limit the

I_AVE

≈

1.05 x (t_ON(min)max + t_OFF) x R_LOAD

where t_OFF= R_Tx C_T, R_LOADis the series resistance of the

load, V_BBis the motor supply voltage and t _ON(min)max is

specified in the electrical characteristics table. When the

motor is rotating, the back EMF generated will influence

the above relationship. For brush dc motor applications,

the current regulation is improved. For stepper motor

applications, when the motor is rotating, the effect is more

complex. A discussion of this subject is included in the

section on stepper motors below.

load current in a slow current-decay mode.

For applications that PWM the ENABLE input and

desire the internal current-limiting circuit to function in the

fast decay mode, the ENABLE input signal should be

inverted and connected to the MODE input. This prevents

the device from being switched into sleep mode when the

ENABLE input is low.

Phase PWM. Toggling the PHASE terminal selects which

sink/source pair is enabled, producing a load current that

varies with the duty cycle and remains continuous at all

times. This can have added benefits in bidirectional brush

dc servo motor applications as the transfer function

between the duty cycle on the PHASE input and the

average voltage applied to the motor is more linear than in

the case of ENABLE PWM control (which produces a

discontinuous current at low current levels). For more

information see “DC Motor Applications” below.

The following procedure can be used to evaluate the

worst-case slow current-decay internal PWM load current

regulation in the system:

Set V_REFto 0 volts. With the load connected and the

PWM current control operating in slow current-decay

mode, use an oscilloscope to measure the time the output

is low (sink on) for the output that is chopping. This is the

typical minimum on time (t_ON(min)typ) for the device. The

C_Tthen should be increased until the measured value of

t_ON(min)is equal to t_ON(min)max as specified in the electrical

characteristics table. When the new value of C_Thas been

set, the value of R_Tshould be decreased so the value for

t_OFF= R_Tx C_T(with the artificially increased value of C_T) is

equal to the nominal design value. The worst-case load-

current regulation then can be measured in the system

under operating conditions.

Synchronous Fixed-Frequency PWM. The internal

PWM current-control circuitry of multiple A3953S—

devices can be synchronized by using the simple circuit

shown in figure 3. A 555 IC can be used to generate the

reset pulse/blanking signal (t₁) for the device and the

period of the PWM cycle (t₂). The value of t₁should be a

minimum of 1.5 ms. When used in this configuration, the

R_Tand C_Tcomponents should be omitted. The PHASE

and ENABLE inputs should not be PWM with this circuit

configuration due to the absence of a blanking function

synchronous with their transitions.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

1...5 6 789 10 11...14

中文翻译

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与A3953相关器件

型号	品牌	获取价格	描述	数据表
A3953KB	ETC	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953S	ETC	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SB	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SB-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLBTR	ALLEGRO	获取价格	Stepper Motor Controller, 1.3A, BIPolar, PDSO16, PLASTIC, SOIC-16
A3953SLBTR-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB-TTR	ALLEGRO	获取价格	暂无描述
A3955	ALLEGRO	获取价格	FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

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