A3959SB

更新时间： 2024-01-03 14:41:50

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器运动控制电子器件信号电路光电二极管电动机控制电机
页数	文件大小	规格书
12页	275K
描述
DMOS FULL-BRIDGE PWM MOTOR DRIVER

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A3959SB 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	HTSSOP, TSSOP28,.25	针数：	28
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.06
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	R-PDSO-G28
JESD-609代码：	e3	长度：	9.7 mm
湿度敏感等级：	2	功能数量：	1
端子数量：	28	最高工作温度：	85 °C
最低工作温度：	-20 °C	最大输出电流：	6 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	HTSSOP
封装等效代码：	TSSOP28,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	1.2 mm	子类别：	Motion Control Electronics
最大供电电流 (Isup)：	10 mA	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：	YES	技术：	NMOS
温度等级：	OTHER	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	4.4 mm	Base Number Matches：	1

A3959SB 数据手册

3959

DMOS FULL-BRIDGE

PWM MOTOR DRIVER

FUNCTIONAL DESCRIPTION (continued)

Internal Current-Control Mode. Inputs PFD1 and

PFD2 determine the current-decay method after an

overcurrent event is detected at the SENSE input. In

slow-decay mode, both sink drivers are turned on for the

fixed off-time period. Mixed-decay mode starts out in

fast-decay mode for a portion (15% or 48%) of the fixed

off time, and then is followed by slow decay for the

remainder of the period.

Synchronous Rectification. When a PWM off cycle

is triggered, either by an ENABLE chop command or

internal fixed off-time cycle, load current will recirculate

according to the decay mode selected by the control logic.

The A3959 synchronous rectification feature will turn on

the appropriate pair of DMOS outputs during the current

decay and effectively short out the body diodes with the

low r_DS(on)driver. This will reduce power dissipation

significantly and can eliminate the need for external

Schottky diodes.

PFD2

PFD1

% t_off

Decay

Slow

Synchronous rectification will prevent reversal of load

current by turning off all outputs when a zero-current level

is detected.

Mixed

Fast

Shutdown. In the event of a fault (excessive junction

temperature, or low voltage on CP or V_REG) the outputs of

the device are disabled until the fault condition is

removed. At power up, and in the event of low V_DD, the

UVLO circuit disables the drivers.

100

PWM Blank Timer. When a source driver turns on, a

current spike occurs due to the reverse-recovery currents

of the clamp diodes and/or switching transients related to

distributed capacitance in the load. To prevent this current

spike from erroneously resetting the source-enable latch,

the sense comparator is blanked. The blank timer runs

after the off-time counter to provide the blanking function.

The blank timer is reset when ENABLE is chopped or

PHASE is changed. For external PWM control, a PHASE

change or ENABLE on will trigger the blanking function.

The duration is determined by the BLANK input and the

oscilator.

Braking. The braking function is implemented by

driving the device in slow-decay mode via EXTMODE

and applying an enable chop command. Because it is

possible to drive current in either direction through the

DMOS drivers, this configuration effectively shorts out

the motor-generated BEMF as long as the ENABLE chop

mode is asserted. It is important to note that the internal

PWM current-control circuit will not limit the current

when braking, because the current does not flow through

the sense resistor. The maximum brake current can be

approximated by V_BEMF/R_L. Care should be taken to

ensure that the maximum ratings of the device are not

exceeded in worst-case braking situations of high speed

and high inertial loads.

BLANK

t_blank

6/f_osc

12/f_osc

SLEEP Logic. The SLEEP input terminal is used to

minimize power consumption when when not in use. This

disables much of the internal circuitry including the

regulator and charge pump. Logic low will put the device

into sleep mode, logic high will allow normal operation.

115 Northeast Cutoff, Box 15036

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

1...3 4 567 8 9...12

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与A3959SB相关器件

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A3959SB-T	ALLEGRO	DMOS FULL-BRIDGE PWM MOTOR DRIVER	获取价格
A3959SLB	ALLEGRO	DMOS FULL-BRIDGE PWM MOTOR DRIVER	获取价格
A3959SLB-T	ALLEGRO	DMOS FULL-BRIDGE PWM MOTOR DRIVER	获取价格
A3959SLBTR-T	ALLEGRO	Stepper Motor Controller, 6A, NMOS, PDSO24, LEAD FREE, MS-013AD, SOIC-24	获取价格
A3959SLB-TTR	ALLEGRO	暂无描述	获取价格
A3959SLP	ALLEGRO	DMOS FULL-BRIDGE PWM MOTOR DRIVER	获取价格

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