A3959SB

更新时间： 2024-02-06 13:34:18

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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技术参数
数据手册

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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

EXT MODE Logic. When using external PWM current

control, the EXT MODE input determines the current path

during the chopped cycle. With EXT MODE low, fast

decay mode, the opposite pair of selected outputs will be

enabled during the off cycle. With EXT MODE high,

slow decay mode, both sink drivers are on with ENABLE

low.

V_REG. This internally generated voltage is used to operate

the sink-side DMOS outputs. The V_REGterminal should

be decoupled with a 0.22 µF capacitor to ground. V_REGis

internally monitored and in the case of a fault condition,

the outputs of the device are disabled.

Charge Pump. The charge pump is used to generate a

gate-supply voltage greater than V_BBto drive the source-

side DMOS gates. A 0.22 µF ceramic capacitor should be

connected between CP1 and CP2 for pumping purposes.

A 0.22 µF ceramic capacitor should be connected between

CP and V_BBto act as a reservoir to operate the high-side

DMOS devices. The CP voltage is internally monitored

and, in the case of a fault condition, the source outputs of

the device are disabled.

EXT MODE

Decay

Fast

Slow

Current Regulation. Load current is regulated by an

internal fixed off-time PWM control circuit. When the

outputs of the DMOS H bridge are turned on, the current

increases in the motor winding until it reaches a trip value

determined by the external sense resistor (R_S) and the

applied analog reference voltage (V_REF):

PHASE Logic. The PHASE input terminal determines if

the device is operating in the “forward” or “reverse” state.

PHASE

OUT_A

Low

OUT_B

High

Low

I_TRIP= V_REF/10R_S

At the trip point, the sense comparator resets the source-

enable latch, turning off the source driver. The load

inductance then causes the current to recirculate for the

fixed off-time period. The current path during

recirculation is determined by the configuration of slow/

mixed/fast current-decay mode via PFD1 and PFD2.

High

ENABLE Logic. The ENABLE input terminal allows

external PWM. ENABLE high turns on the selected sink-

source pair. ENABLE low switches off the source driver

or the source and sink driver, depending on EXT MODE,

and the load current decays. If ENABLE is kept high, the

current will rise until it reaches the level set by the internal

current-control circuit.

Oscillator. The PWM timer is based on an internal

oscillator set by a resistor connected from the R_OSC

terminal to V_DD. Typical value of 4 MHz is set with a

51 kΩ resistor. The allowable range of the resistor is from

20 kΩ to 100 kΩ.

ENABLE

Outputs

Chopped

_OSC= 204 x 10⁹/R_OSC

If R_OSCis not pulled up to V_DD, it must be shorted to

ground.

Fixed Off Time. The A3959 is set for a fixed off time of

96 cycles of the internal oscillator, typically 24 µs with a

4 MHz oscillator.

www.allegromicro.com

1 2 3 456 7 8...12

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与A3959SB相关器件

型号	品牌	描述	获取价格	数据表
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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