A4954

更新时间： 2024-02-07 16:29:47

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
9页	248K
描述
Dual Full-Bridge DMOS PWM Motor Driver

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A4954 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：	LEAD FREE, MO-153ABT, TSSOP-16	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.78
模拟集成电路 - 其他类型：	BRUSH DC MOTOR CONTROLLER	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e3	长度：	5 mm
湿度敏感等级：	2	功能数量：	1
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电流：	2 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	HTSSOP
封装等效代码：	TSSOP16,.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：	8/40 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)：	0.01 mA	最大供电电压 (Vsup)：	40 V
最小供电电压 (Vsup)：	8 V	表面贴装：	YES
温度等级：	INDUSTRIAL	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

A4954 数据手册

Dual Full-Bridge DMOS

PWM Motor Driver

A4954

Functional Description

Device Operation

V_REF

The A4954 is designed to operate two DC motors. The output

drivers are all low-R_DS(on), N-channel DMOS drivers that feature

internal synchronous rectification to reduce power dissipation.

The current in each of the two output full bridges is regulated

with fixed off-time pulse width modulated (PWM) control cir-

cuitry. The IN1-IN2 and IN3-IN4 inputs allow two-wire control

for each bridge.

I_TripMAX

A_V

R_S

where V_REFis the input voltage on the VREFx pin (V) and R_Sis

the resistance of the sense resistor (Ω) on the corresponding LSSx

terminal.

Overcurrent Protection

A current monitor will protect the IC from damage due to output

shorts. If a short is detected, the IC will latch the fault and dis-

able the outputs. Each channel has independent OCP protection.

The fault latch can only be cleared by coming out of Low Power

Standby mode or by cycling the power to VBB. During OCP

events, Absolute Maximum Ratings may be exceeded for a short

period of time before the device latches.

Protection circuitry includes internal thermal shutdown, and pro-

tection against shorted loads, or against output shorts to ground

or supply. Undervoltage lockout prevents damage by keeping the

outputs off until the driver has enough voltage to operate nor-

mally.

Standby Mode

Low Power Standby mode is activated when all four input (INx)

pins are low for longer than 1 ms. Low Power Standby mode

disables most of the internal circuitry, including the charge pump

and the regulator. When the A4954 is coming out of standby

mode, the charge pump should be allowed to reach its regulated

voltage (a maximum delay of 200 μs) before any PWM com-

mands are issued to the device.

Shutdown

If the die temperature increases to approximately 160°C, the full

bridge outputs will be disabled until the internal temperature falls

below a hysteresis, T_TSDhys, of 15°C. Internal UVLO is present

on VBB to prevent the output drivers from turning-on below the

UVLO threshold.

Internal PWM Current Control

Braking

Initially, a diagonal pair of source and sink FET outputs are

enabled and current flows through the motor winding and the

optional external current sense resistor, R_Sx. When the voltage

across R_Sxequals the comparator trip value, then the current

sense comparator resets the PWM latch. The latch then turns off

the sink and source FETs (Mixed Decay mode).

The braking function is implemented by driving the device in

Slow Decay mode, which is done by applying a logic high to both

inputs of both channels, after a bridge-enable Chop command

(see PWM Control Truth Table). Because it is possible to drive

current in both directions through the DMOS switches, this con-

figuration effectively shorts-out the motor-generated BEMF, as

long as the Chop command is asserted. The maximum 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 worse

case braking situations: high speed and high-inertia loads.

V_REF

The maximum value of current limiting is set by the selection

of R_Sxand the voltage at the VREFx pin in each channel. The

transconductance function is approximated by the maximum

value of current limiting, I_TripMAX(A), which is set by:

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1 2 3 456 7 8 9

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