Datasheet > 3977

3977

更新时间： 2024-02-04 20:20:47

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
18页	564K
描述
MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

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中文翻译

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数据手册

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3977 数据手册

3977

MICROSTEPPING DMOS DRIVER

WITH TRANSLATOR

The A3977xED and A3977xLP are complete microstepping motor drivers

with built-in translator. They are designed to operate bipolar stepper motors in

full-, half-, quarter-, and eighth-step modes, with output drive capability of 35

V and ±2.5 A. The A3977 includes a fixed off-time current regulator that has

the ability to operate in slow-, fast-, or mixed-decay modes. This current-

decay control scheme results in reduced audible motor noise, increased step

accuracy, and reduced power dissipation.

A3977xED

(PLCC)

BB1

The translator is the key to the easy implementation of the A3977. By

simply inputting one pulse on the STEP input the motor will take one step

(full, half, quarter, or eighth depending on two logic inputs). There are no

phase-sequence tables, high-frequency control lines, or complex interfaces to

program. The A3977 interface is an ideal fit for applications where a complex

µP is unavailable or over-burdened.

PWM

TIMER

PFD

VCP

GND

REF

GND

REG

VREG

÷8

Internal synchronous-rectification control circuitry is provided to improve

power dissipation during PWM operation.

STEP

LOGIC

SUPPLY

VDD

Internal circuit protection includes thermal shutdown with hysteresis,

under-voltage lockout (UVLO) and crossover-current protection. Special

power-up sequencing is not required.

BB2

Dwg. PP-075-1

The A3977 is supplied in a choice of two power packages, a 44-pin

plastic PLCC with copper batwing tabs (suffix ED), and a thin (<1.2 mm), 28-

pin TSSOP with an exposed thermal pad (suffix LP). The SLP package is

available in a lead-free version (100% matte tin leadframe).

ABSOLUTE MAXIMUM RATINGS

at T_A= +25°C

FEATURES

■ ±2.5 A, 35 V Output Rating

Load Supply Voltage, V_BB............. 35 V

Output Current, I_OUT.................. ±2.5 A

Logic Supply Voltage, V_DD........... 7.0 V

Logic Input Voltage Range, V_IN

■ Low r_DS(on)Outputs, 0.45 Ω Source, 0.36 Ω Sink Typical

■ Automatic Current Decay Mode Detection/Selection

■ 3.0 V to 5.5 V Logic Supply Voltage Range

■ Mixed, Fast, and Slow Current Decay Modes

■ Home Output

■ Synchronous Rectification for Low Power Dissipation

■ Internal UVLO and Thermal Shutdown Circuitry

■ Crossover-Current Protection

(t_w>30 ns)..... -0.3 V to V_DD+ 0.3 V

(t_w<30 ns)........... -1 V to V_DD+ 1 V

Sense Voltage, V_SENSE................. 0.5 V

Reference Voltage, V_REF................ V_DD

Package Power Dissipation,

P_D................................. See page 3

Operating Temperature Range, T_A

(A3977Kx)............ -40°C to +125°C

(A3977Sx).............. -20°C to +85°C

Junction Temperature, T_J......... +150°C

Storage Temperature Range,

Always order by complete part number:

Part Number

Package

T_S......................... -55°C to +150°C

A3977KED

A3977KLP

A3977SED

A3977SED-T

A3977SLP

A3977SLP-T

44-pin PLCC

* Output current rating may be limited by

duty cycle, ambient temperature, and heat

sinking. Under any set of conditions, do not

exceed the specified current rating or a

junction temperature of 150°C.

28-pin TSSOP

44-pin PLCC

44-pin PLCC; Lead-free

28-pin TSSOP

28-pin TSSOP; Lead-free

12 3 4 5 6 7...18

中文翻译

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