Datasheet > A3953KB

A3953KB

更新时间： 2024-01-08 04:42:18

品牌	Logo	应用领域
其他 - ETC		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
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A3953KB 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

A3953KB 数据手册

3953

FULL-BRIDGE

PWM MOTOR DRIVER

FUNCTIONAL DESCRIPTION

The user selects an external resistor (R_T) and capaci-

tor (C_T) to determine the time period (t_OFF= R_Tx C_T)

during which the drivers remain disabled (see “RC Fixed

Off-Time” below). At the end of the RC interval, the

drivers are enabled allowing the load current to increase

again. The PWM cycle repeats, maintaining the peak

load current at the desired value (see figure 2).

Internal PWM Current Control During Forward and

Reverse Operation. The A3953S— contains a fixed off-

time pulse-width modulated (PWM) current-control circuit

that can be used to limit the load current to a desired

value. The peak value of the current limiting (I_TRIP) is set

by the selection of an external current sensing resistor

(R_S) and reference input voltage (V_REF). The internal

circuitry compares the voltage across the external sense

resistor to the voltage on the reference input terminal

(REF) resulting in a transconductance function approxi-

Figure 2

Fast and Slow Current-Decay Waveforms

ENABLE

mated by:

V_REF

R_S

I_TRIP

≈

– I_SO

MODE

where I_SOis the offset due to base drive current.

TRIP

In forward or reverse mode the current-control cir-

cuitry limits the load current as follows: when the load

current reaches I_TRIP, the comparator resets a latch that

turns off the selected source driver or selected sink and

source driver pair depending on whether the device is

operating in slow or fast current-decay mode, respec-

tively.

LOAD

CURRENT

Dwg. WP-015-1

In slow current-decay mode, the selected source

driver is disabled; the load inductance causes the current

to recirculate through the sink driver and ground clamp

diode. In fast current-decay mode, the selected sink and

source driver pair are disabled; the load inductance

causes the current to flow from ground to the load supply

via the ground clamp and flyback diodes.

INTERNAL PWM CURRENT CONTROL

DURING BRAKE-MODE OPERATION

Brake Operation - MODE Input High. The brake circuit

turns off both source drivers and turns on both sink

drivers. For dc motor applications, this has the effect of

shorting the motor’s back-EMF voltage resulting in current

flow that dynamically brakes the motor. If the back-EMF

voltage is large, and there is no PWM current limiting, the

load current can increase to a value that approaches that

of a locked rotor condition. To limit the current, when the

I_TRIPlevel is reached, the PWM circuit disables the

conducting sink drivers. The energy stored in the motor’s

inductance is discharged into the load supply causing the

motor current to decay.

Figure 1 — Load-Current Paths

DRIVE CURRENT

RECIRCULATION (SLOW-DECAY MODE)

RECIRCULATION (FAST-DECAY MODE)

As in the case of forward/reverse operation, the

drivers are enabled after a time given by t_OFF= R_Tx C_T

(see “RC Fixed Off-Time” below). Depending on the

back-EMF voltage (proportional to the motor’s decreasing

speed), the load current again may increase to I_TRIP. If so,

the PWM cycle will repeat, limiting the peak load current

to the desired value.

Dwg. EP-006-13A

115 Northeast Cutoff, Box 15036

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

1...3 4 567 8 9...14

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与A3953KB相关器件

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

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