A3953

更新时间： 2024-01-16 18:01:24

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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技术参数
数据手册

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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

During braking, when the MODE input is high, the

peak current limit can be approximated by:

RC Blanking. In addition to determining the fixed off-time

of the PWM control circuit, the C_Tcomponent 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). The comparator output is

blanked to prevent false over-current detections due to

reverse recovery currents of the clamp diodes, and/or

switching transients related to distributed capacitance in

the load.

V_REF

I_{TRIP BRAKE MH}

≈

R_S

CAUTION: Because the kinetic energy stored in the motor

and load inertia is being converted into current, which

charges the V_BBsupply 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.

During internal PWM operation, at the end of the t_OFF

time, the comparator’s output is blanked and C_Tbegins to

be charged from approximately 0.22V_CCby an internal

current source of approximately 1 mA. The comparator

output remains blanked until the voltage on C_Treaches

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 mea-

sured 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:

approximately 0.60V_CC

When a transition of the PHASE input occurs, C_Tis

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_Tis charged by an internal

current source of approximately 1 mA. The comparator

output remains blanked until the voltage on C_Treaches

V_BEMF– 1V

I_{PEAK BRAKE ML}

≈

R_LOAD

approximately 0.60V_CC

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 kΩ to

100 kΩ, is approximated by:

When the device is disabled, via the ENABLE input,

C_Tis discharged to near ground. When the device is re-

enabled, C_Tis charged by an internal current source of

approximately 1 mA. The comparator output remains

blanked until the voltage on C_Treaches approximately

0.60V_CC

For 3.3 V operation, the minimum recommended

value for C_Tis 680 pF 5 %. For 5.0 V operation, the

minimum recommended value for C_Tis 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_Tare recommended and the value of

R_Tcan be sized to determine t_OFF. For more information

regarding load current regulation, see below.

t_OFF≈ R_Tx 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).

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A3953SLB	ALLEGRO	FULL-BRIDGE PWM MOTOR DRIVER	获取价格
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