A3951

更新时间： 2024-02-26 00:36:26

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
12页	202K
描述
FULL-BRIDGE PWM MOTOR DRIVER

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技术参数
数据手册

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A3951 技术参数

生命周期：	Obsolete	零件包装代码：	SFM
包装说明：	,	针数：	12
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.83
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	R-PSFM-T12
功能数量：	1	端子数量：	12
最高工作温度：	85 °C	最低工作温度：	-20 °C
最大输出电流：	3.5 A	封装主体材料：	PLASTIC/EPOXY
封装形状：	RECTANGULAR	封装形式：	FLANGE MOUNT
认证状态：	Not Qualified	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	标称供电电压 (Vsup)：	5 V
表面贴装：	NO	温度等级：	OTHER
端子形式：	THROUGH-HOLE	端子位置：	SINGLE
Base Number Matches：	1

A3951 数据手册

3951

FULL-BRIDGE

PWM MOTOR DRIVER

between the duty cycle on the phase input and the aver-

age voltage applied to the motor is more linear than in the

case of ENABLE PWM control (which produces a discon-

tinuous current at low current levels). See also, “DC Motor

Applications” below.

MISCELLANEOUS INFORMATION

An internally generated dead time prevents crossover

currents that can occur when switching phase or braking.

DRIVE CURRENT

RECIRCULATION

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.

Dwg. EP-006-10

Figure 3 — Load-Current Paths

ENABLE Pulse-Width Modulation

Toggling the ENABLE input turns on and off the

selected source and sink drivers; the load inductance

causes the current to flow from ground to the load supply

via the ground clamp and flyback diodes (four-quadrant

operation or fast decay). See figure 3. When the device is

enabled, the internal current-control circuitry will be active

and can be used to limit the load current in the normal

internal PWM slow-decay or two-quadrant mode of opera-

tion.

If the internal current-control circuitry is not used; the

V_REFterminal should be connected to V_CC, the SENSE

terminal should be connected to ground, and the RC

terminal should be left floating (no connection).

An internal under-voltage lockout circuit prevents

simultaneous conduction of the outputs when the device is

powered up or powered down.

ENABLE

APPLICATIONS NOTES

Current Sensing

The actual peak load current (I_OUTP) will be greater

than the calculated value of I_TRIPdue to delays in the turn

off of the drivers. The amount of overshoot can be ap-

proximated as

TRIP

LOAD

CURRENT

(V_BB– ((I_TRIP• R_LOAD) + V_BEMF)) • t_pd(pwm)

I_OUTP

≈

L_LOAD

Dwg. WP-015-4

Figure 4 — ENABLE PWM Load-Current Waveform

PHASE Pulse-Width Modulation

where V_BBis the load/motor supply voltage, V_BEMFis the

back-EMF voltage of the load, R_LOADand L_LOADare the

resistance and inductance of the load respectively, and

t_pd(pwm)is the propagation delay as specified in the electrical

characteristics table.

Toggling the PHASE terminal determines/controls

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

The reference terminal has an equivalent input resis-

tance of 50 kΩ 30%. This should be taken into account

when determining the impedance of the external circuit

that sets the reference voltage value.

www.allegromicro.com

1...4 5 678 9 10...12

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与A3951相关器件

型号	品牌	描述	获取价格	数据表
A3951SB	ALLEGRO	FULL-BRIDGE PWM MOTOR DRIVER	获取价格
A3951SB	SANKEN	Stepper Motor Controller, 3.5A, PDIP16, HEAT SINK, PLASTIC, DIP-16	获取价格
A3951SW	SANKEN	Stepper Motor Controller, 3.5A, PSFM12, POWER, SIP-12	获取价格
A3951SW	ALLEGRO	FULL-BRIDGE PWM MOTOR DRIVER	获取价格
A3952EB	ALLEGRO	Stepper Motor Controller, 3.5A, PDIP16, 0.300 INCH, PLASTIC, DIP-16	获取价格
A3952EEB	ALLEGRO	Stepper Motor Controller, 3.5A, PQCC28, PLASTIC, LCC-28	获取价格

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