3966 Datasheet PDF ( Pinout ) - DUAL FULL-BRIDGE PWM MOTOR DRIVER

3966 Datasheet PDF - Allegro MicroSystems

Part Number	*3966*
Description	DUAL FULL-BRIDGE PWM MOTOR DRIVER
Manufacturers	Allegro MicroSystems
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3966

A3966SLB

OUT1A 1

PHASE 1 2

ENABLE 1 3

GROUND 4

V BB

LOGIC LOGIC

16 OUT2A

15 PHASE 2

14 ENABLE 2

13 GROUND

SENSE1 5

OUT1B 6

LOAD

SUPPLY 7

V BB

REFERENCE 8 VREF

12 SENSE 2

11 OUT 2B

VCC

LOGIC

SUPPLY

RC 9 RC

Dwg. PP-066-1

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB ...................... 30 V

Output Current, IOUT (peak) ........... ±750 mA

(continuous) .............................. ±650 mA

Logic Supply Voltage, VCC .................... 7.0 V

Input Voltage, Vin ........ -0.3 V to VCC + 0.3 V

Sense Voltage, VS ................................ 1.0 V

Package Power Dissipation (TA = 25°C), PD

A3966SA ..................................... 2.08 W*

A3966SLB ................................... 1.87 W*

Operating Temperature Range,

TA ..................................... -20°C to +85°C

Junction Temperature,

TJ .................................................. +150°C

Storage Temperature Range,

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

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.

* Per SEMI G42-88 Specification, Thermal Test Board

Standardization for Measuring Junction-to-Ambient

Thermal Resistance of Semiconductor Packages.

DUAL FULL-BRIDGE PWM

MOTOR DRIVER

The A3966SA and A3966SLB are designed to drive both windings of a

two-phase bipolar stepper motor. Each device includes two H-bridges

capable of continuous output currents of ±650 mA and operating voltages to

30 V. Motor winding current can be controlled by the internal fixed-fre-

quency, pulse-width modulated (PWM), current-control circuitry. The peak

load current limit is set by the user’s selection of a reference voltage and

current-sensing resistors. Except for package style and pinout, the two

devices are identical.

The fixed-frequency pulse duration is set by a user-selected external

RC timing network. The capacitor in the RC timing network also determines

a user-selectable blanking window that prevents false triggering of the PWM

current-control circuitry during switching transitions.

To reduce on-chip power dissipation, the H-bridge power outputs have

been optimized for low saturation voltages. The sink drivers feature Allegro’s

patented Satlington™ output structure. The Satlington outputs combine the

low voltage drop of a saturated transistor and the high peak current capability

of a Darlington.

For each bridge, a PHASE input controls load-current polarity by

selecting the appropriate source and sink driver pair. For each bridge, an

ENABLE input, when held high, disables the output drivers. Special power-

up sequencing is not required. Internal circuit protection includes thermal

shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-

current protection.

The A3966SA is supplied in a 16-pin dual in-line plastic package. The

A3966SLB is supplied in a 16-lead plastic SOIC with copper heat sink tabs.

The power tab is at ground potential and needs no electrical isolation.

FEATURES

I ±650 mA Continuous Output Current

I 30 V Output Voltage Rating

I Internal Fixed-Frequency PWM Current Control

I Satlington™ Sink Drivers

I User-Selectable Blanking Window

I Internal Ground-Clamp & Flyback Diodes

I Internal Thermal-Shutdown Circuitry

I Crossover-Current Protection and UVLO Protection

Always order by complete part number:

Part Number Package

A3966SA

16-pin DIP

A3966SLB

16-lead batwing SOIC

RθJA

60°C/W

67°C/W

RθJC

38°C/W

—

RθJT

—

6°C/W

3966

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

FUNCTIONAL DESCRIPTION

Internal PWM Current Control. The A3966SA and

A3966SLB dual H-bridges are designed to drive both

windings of a bipolar stepper motor. Load current can be

controlled in each motor winding by an internal fixed-

frequency PWM control circuit. The current-control

circuitry works as follows: when the outputs of the H-

bridge are turned on, current increases in the motor wind-

ing. The load current is sensed by the current-control

comparator via an external sense resistor (RS). Load

current continues to increase until it reaches the predeter-

mined value, set by the selection of external current-

sensing resistors and reference input voltage (VREF)

according to the equation:

ITRIP = IOUT + ISO = VREF/(4 RS)

where ISO is the sense-current error (typically 18 mA) due

to the base-drive current of the sink driver transistor.

At the trip point, the comparator resets the source-

enable latch, turning off the source driver of that H-bridge.

The source turn off of one H-bridge is independent of the

other H-bridge. Load inductance causes the current to

recirculate through the sink driver and ground-clamp

diode. The current decreases until the internal clock

oscillator sets the source-enable latches of both H-bridges,

turning on the source drivers of both bridges. Load current

increases again, and the cycle is repeated.

V PHASE

The frequency of the internal clock oscillator is set by

the external timing components RTCT. The frequency can

be approximately calculated as:

fosc = 1/(RT CT + tblank)

where tblank is defined below.

The range of recommended values for RT and CT are

20 kΩ to 100 kΩ and 470 pF to 1000 pF respectively.

Nominal values of 56 kΩ and 680 pF result in a clock

frequency of 25 kHz.

Current-Sense Comparator Blanking. When the

source driver is turned on, a current spike occurs due to

the reverse-recovery currents of the clamp diodes and

switching transients related to distributed capacitance in

the load. To prevent this current spike from erroneously

resetting the source enable latch, the current-control

comparator output is blanked for a short period of time

when the source driver is turned on. The blanking time is

set by the timing component CT according to the equa-

tion:

tblank = 1900 CT (µs).

A nominal CT value of 680 pF will give a blanking

time of 1.3 µs.

The current-control comparator is also blanked when

the H-bridge outputs are switched by the PHASE or

ENABLE inputs. This internally generated blank time is

approximately 1 µs.

I OUT

–

BRIDGE

INTERNAL

OSCILLATOR

ALL

OFF

ITRIP

RTC T

SOURCE

OFF

tblank

Dwg. WM-003-2

BRIDGE ON

SOURCE OFF

ALL OFF

Dwg. EP-006-16

www.allegromicro.com

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