A3938SLD

更新时间： 2024-02-09 15:00:50

品牌	Logo	应用领域
急速微 - ALLEGRO		运动控制电子器件信号电路光电二极管电动机控制控制器
页数	文件大小	规格书
11页	399K
描述
Three-Phase Power MOSFET Controller

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技术参数
数据手册
替代型号

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A3938SLD 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SSOP, SOP36,.4,32
针数：	36	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.73	模拟集成电路 - 其他类型：	BRUSHLESS DC MOTOR CONTROLLER
JESD-30 代码：	R-PDSO-G36	长度：	15.3 mm
功能数量：	1	端子数量：	36
最高工作温度：	85 °C	最低工作温度：	-20 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SSOP
封装等效代码：	SOP36,.4,32	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, SHRINK PITCH	电源：	18/50 V
认证状态：	Not Qualified	座面最大高度：	2.64 mm
子类别：	Motion Control Electronics	最大供电电流 (Isup)：	8 mA
最大供电电压 (Vsup)：	50 V	最小供电电压 (Vsup)：	18 V
表面贴装：	YES	温度等级：	OTHER
端子形式：	GULL WING	端子节距：	0.8 mm
端子位置：	DUAL	宽度：	7.5 mm
Base Number Matches：	1

A3938SLD 数据手册

A3938

Three-Phase Power MOSFET Controller

each commutation. If a stalled motor results from a fault, the

fault can only be cleared by toggling the RESET pin or by a

power-up sequence.

of the power MOSFETs. To prevent false tripping of the

sense comparator, the BLANK function disables the com-

parator for a time period deﬁned by:

Current Regulation. Load current can be regulated by

an internal ﬁxed off-time, PWM-control circuit. When the

outputs of the MOSFETs are turned on, current increases in

the motor winding until it reaches a value given by:

t_BLANK= 1.9 C / (1 10^-3– [2 / R ])

The user must ensure that C_Tis large enough to cover the

current spike duration.

Braking. The A3938 dynamically brakes the motor by

forcing all low-side power MOSFETs on, and all high-side

power MOSFETs off. This effectively short-circuits the

BEMF and brakes the motor. During braking, the load cur-

rent can be approximated by:

I_TRIP= V_REF/ R_SENSE

At the trip point, the sense comparator resets the source

enable latch, turning off the source driver. At this point, load

inductance causes the current to recirculate for the ﬁxed off-

time period. The current path during recirculation is deter-

mined by the conﬁguration of the MODE and SR input pins.

The ﬁxed off-time is determined by an external resistor, R_T,

and capacitor, C_T, connected in parallel from the RC terminal

to AGND. The ﬁxed off-time is approximated by:

I_BRAKEPEAK= V_BEMF/ R_LOAD

As the current does not ﬂow through the sense resistor dur-

ing a dynamic brake, care should be taken to ensure that the

maximum ratings of the power MOSFETs are not exceeded.

t_OFF= R

Note: On its rising edge, a RESET setting of 1 overrides the

BRAKE input pin and latches the condition selected by the

BRKSEL pin.

t_OFFshould be in the range between 10 µs and 50 µs. Larger

values for t_OFFcould result in audible noise problems. For

proper circuit operation, 10 kΩ < R_T< 500 kΩ.

Power Loss Brake. The BRKCAP and BRKSEL pins

provide a power-down braking option. A Power-Loss Brake

Trigger Event, which is either an undervoltage on VREG

or a RESET = 1 rising edge, is sensed by the A3938, which

then dynamically brakes or coasts (depending on the stored

BRKSEL setting) the motor. The reservoir capacitor on the

BRKCAP pin provides the positive voltage that forces the

low-side gates of the power MOSFETs high, keeping them

on, even after supply voltage is lost. A stored setting of BRK-

SEL = 1 brakes the motor, but a stored setting of BRKSEL = 0

coasts it. The combined effect of these settings is shown in the

table Brake Control.

Torque control can be implemented by varying the REF input

voltage as long as the PWM input stays high. If direct control

of the torque/current is desired by PWM input, a voltage can

be applied to the REF pin to set an absolute maximum cur-

rent limit.

PWM Blank. The capacitor C_Talso serves as the means

to set the BLANK time duration. At the end of a PWM

off-cycle, a high-side gate selected by the commutation logic

turns on. At this time, large current transients can occur dur-

ing the reverse recovery time, t_rr, of the intrinsic body diodes

Brake Control

BRAKE BRKSEL

Before Power Loss Brake Trigger Event

After Power Loss Brake Trigger Event

Coast mode – All gate drive outputs OFF

Brake mode – All low-side gate drivers ON

Normal run mode

Brake mode – All low-side gate drivers ON Coast mode – All gate drive outputs OFF

Brake mode – All low-side gate drivers ON Brake mode – All low-side gate drivers ON

www.allegromicro.com

115 Northeast Cutoff, Box 15036

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

1...5 6 789 10 11

中文翻译

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A3938SLD 替代型号

型号	品牌	替代类型	描述	数据表
A3932SLDTR-T	ALLEGRO	完全替代	暂无描述
A3938SLDTR-T	ALLEGRO	完全替代	暂无描述
A3932SLD-T	ALLEGRO	完全替代	Three-Phase Power MOSFET Controller

与A3938SLD相关器件

型号	品牌	获取价格	描述	数据表
A3938SLD-T	ALLEGRO	获取价格	Three-Phase Power MOSFET Controller
A3938SLDTR	ALLEGRO	获取价格	Brushless DC Motor Controller, PDSO38, MO-153BD-1, TSSOP-38
A3938SLDTR-T	ALLEGRO	获取价格	暂无描述
A3938SLQ	ALLEGRO	获取价格	Three-Phase Power MOSFET Controller
A3938SLQTR	ALLEGRO	获取价格	Brushless DC Motor Controller, PDSO36, QSOP-36
A3940-0000T	3M	获取价格	100 x 100, PCB Two Row
A3940-0010T	3M	获取价格	100 x 100, PCB Two Row
A3940-2000T	3M	获取价格	100 x 100, PCB Two Row
A3940-2010T	3M	获取价格	100 x 100, PCB Two Row
A3940KLP	ALLEGRO	获取价格	FULL-BRIDGE POWER MOSFET CONTROLLER

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