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A3995SEVTR-T

更新时间： 2024-02-01 04:17:42

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电动机控制电机
页数	文件大小	规格书
9页	943K
描述
DMOS Dual Full Bridge PWM Motor Driver

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A3995SEVTR-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	QFN-36	针数：	36
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	8.56
Is Samacsys：	N	其他特性：	ALSO REQUIRES 8V TO 36V VBB SUPPLY
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	S-XQCC-N36
JESD-609代码：	e3	长度：	6 mm
湿度敏感等级：	2	功能数量：	2
端子数量：	36	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：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC36,.25SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	3.3/5,36 V	认证状态：	Not Qualified
座面最大高度：	1 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)：	3 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：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	6 mm
Base Number Matches：	1

A3995SEVTR-T 数据手册

A3995

DMOS Dual Full Bridge PWM Motor Driver

Functional Description

Device Operation The A3995 is designed to operate two

dc motors. The currents in each of the output full-bridges, all

N-channel DMOS, are regulated with fixed off-time pulse width

modulated (PWM) control circuitry. The peak current to each full

bridge is set by the value of an external current sense resistor,

Control Logic Dc motor commutation is accomplished by

applying a PWM signal together with the PHASE or ENABLE

inputs. Fast or slow current decay during the off-time is selected

via the MODE pin. Synchronous Rectification is always active

regardless of the state of the MODE pin.

R_Sx, and a reference voltage, V_REFx

Charge Pump (CP1 and CP2) The charge pump is used to

generate a gate supply greater than the V_BBin order to drive the

source-side DMOS gates. A 0.1 μF ceramic capacitor should be

connected between CP1 and CP2 for pumping purposes. A 0.1 μF

ceramic capacitor is required between VCP and VBBx to act as a

reservoir to operate the high-side DMOS devices.

If the logic inputs are pulled up to VDD, it is good practice to use

a high value pullup resistor in order to limit current to the logic

inputs should an overvoltage event occur. Logic inputs include:

PHASEx, ENABLEx, and MODE.

Internal PWM Current Control Each full-bridge is con-

trolled by a fixed off-time PWM current control circuit that limits

the load current to a desired value, I_TRIP. Initially, a diagonal pair

of source and sink DMOS outputs are enabled and current flows

through the motor winding and R_Sx. When the voltage across the

current sense resistor equals the voltage on the VREFx pin, the

current sense comparator resets the PWM latch, which turns off

the source driver.

Shutdown In the event of a fault (excessive junction tem-

perature, or low voltage on VCP), the outputs of the device are

disabled until the fault condition is removed. At power-up, the

undervoltage lockout (UVLO) circuit disables the drivers.

Synchronous Rectification When a PWM-off cycle is

triggered by an internal fixed off-time cycle, load current will

recirculate. The A3995 synchronous rectification feature will

turn on the appropriate MOSFETs during the current decay. This

effectively shorts the body diode with the low R_DS(on)driver. This

significantly lowers power dissipation. When a zero current level

is detected, synchronous rectification is turned off to prevent

reversal of the load current.

The maximum value of current limiting is set by the selection of

R_Sand the voltage at the VREF input with a transconductance

function approximated by:

I_TripMax= V_REF/ (3×R_S)

Note: It is critical to ensure that the maximum rating of ±500 mV

on each SENSEx pin is not exceeded.

MODE Control input MODE is used to toggle between fast

decay mode and slow decay mode. A logic high puts the device

in slow decay mode. Synchronous rectification is always enabled

when ENABLE is low.

Fixed Off-Time The internal PWM current control circuitry

uses a one shot circuit to control the time the drivers remain off.

The one shot off-time, t_off, is internally set to 30 µs.

Blanking This function blanks the output of the current sense

comparator when the outputs are switched by the internal current

control circuitry. The comparator output is blanked to prevent

false detections of overcurrent conditions, due to reverse recovery

currents of the clamp diodes, or to switching transients related

to the capacitance of the load. The driver blank time, t_BLANK, is

approximately 3 μs.

Braking The Braking function is implemented by driving the

device in slow decay mode via the MODE pin and applying an

ENABLE chop command. Because it is possible to drive current

in both directions through the DMOS switches, this configura-

tion effectively shorts the motor-generated BEMF as long as the

ENABLE chop mode 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 worst case

braking situations: high speed and high inertia loads.

Phase Input (PHASEx) The state of the PHASEx input

determines the direction of rotation of the motor.

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

1...3 4 567 8 9

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