A3952SB Allegro Micro Systems, Inc., A3952SB Datasheet

A3952SB

Manufacturer Part Number

A3952SB

Description

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3952SB.pdf (16 pages)

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Download datasheet (216Kb)

GROUND

SUPPLY

ENABLE

PHASE

Note that the A3952SB (DIP) and the A3952SLB

(SOIC) are electrically identical and share a

common terminal number assignment.

Load Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range,

Sense Voltage, V

Reference Voltage, V

Package Power Dissipation,

Operating Temperature Range,

Junction Temperature, T

Storage Temperature Range,

Output current rating may be limited by duty cycle,

ambient temperature, heat sinking and/or forced

cooling. Under any set of conditions, do not

exceed the specified current rating or a junction

temperature of +150 C.

* Fault conditions that produce excessive junction

temperature will activate device thermal shutdown

circuitry. These conditions can be tolerated but

should be avoided.

BRAKE

LOGIC

REF

(Continuous) ...............................

....................... -0.3 V to V

....................................... See Graph

............................... –20 C to +85 C

............................. –55 C to +150 C

20 s) ..................................

OUT

SENSE

LOGIC

REF

...................... 1.5 V

.................... 15 V

............. +150 C*

.................. 50 V

................. 7.0 V

Dwg. PP-056

+ 0.3 V

LOAD

SUPPLY

OUT B

MODE

GROUND

SENSE

OUT A

LOAD

SUPPLY

3.5 A

2.0 A

FULL-BRIDGE PWM MOTOR DRIVER

3952

inductive loads, the A3952S– is capable of continuous output currents

to 2 A and operating voltages to 50 V. Internal fixed off-time PWM

current-control circuitry can be used to regulate the maximum load

current to a desired value. The peak load current limit is set by the

user’s selection of an input reference voltage and external sensing

resistor. The fixed OFF-time pulse duration is set by a user-selected

external RC timing network. Internal circuit protection includes thermal

shutdown with hysteresis, transient suppression diodes, and crossover-

current protection. Special power-up sequencing is not required.

current polarity by selecting the appropriate source and sink driver pair.

The MODE input determines whether the PWM current-control circuitry

operates in a slow current-decay mode (only the selected sink driver

switching) or in a fast current-decay mode (selected source and sink

switching). A user-selectable blanking window prevents false triggering

of the PWM current control circuitry. With the ENABLE input held high,

all output drivers are disabled. A sleep mode is provided to reduce

power consumption when inactive.

function is enabled. This overrides ENABLE and PHASE to turn OFF

both source drivers and turn ON both sink drivers. The brake function

can be safely used to dynamically brake brush dc motors.

package styles, the batwing/power tab is at ground potential and needs

no isolation. These devices are also available for operation from -40 C

to +125 C. To order, change the suffix from 'S–' to 'K–'.

Always order by complete part number:

A3952SB

A3952SEB

A3952SLB

A3952SW

Part Number

Designed for bidirectional pulse-width modulated current control of

With the ENABLE input held low, the PHASE input controls load

When a logic low is applied to the BRAKE input, the braking

The A3952S– is supplied in a choice of four power packages. In all

50 V Output Voltage Rating

Internal PWM Current Control

Fast and Slow Current-Decay Modes

Sleep (Low Current Consumption) Mode

Internal Transient Suppression Diodes

Under-Voltage Lockout

Internal Thermal Shutdown Circuitry

Crossover-Current Protection

2 A Continuous Output Current Rating

12-Pin Power-Tab SIP

28-Lead PLCC

16-Lead SOIC

16-Pin DIP

Package

43 C/W

42 C/W

67 C/W

36 C/W

6.0 C/W

2.0 C/W

Related parts for A3952SB

A3952SB Summary of contents

Page 1

... LOGIC SUPPLY PHASE ENABLE 8 9 Note that the A3952SB (DIP) and the A3952SLB (SOIC) are electrically identical and share a common terminal number assignment. Load Supply Voltage, V .................. Output Current, I OUT ( .................................. w (Continuous) ............................... Logic Supply Voltage, V ................. 7.0 V ...

Page 2

FULL-BRIDGE PWM MOTOR DRIVER SLEEP & STANDBY MODES MODE PHASE ENABLE BRAKE LOGIC V CC SUPPLY REF 1 GROUND 10 'B' , 'EB', & 'LB' TAB 8 6 'W' AMBIENT 4 'B' & 'EB' AMBIENT 'LB' ...

Page 3

FULL-BRIDGE PWM MOTOR DRIVER 5 GROUND LOGIC GROUND Characteristic Output Drivers Load Supply Voltage Range Output Leakage Current Output Saturation Voltage Clamp Diode Forward Voltage (Source or Sink) Load ...

Page 4

FULL-BRIDGE PWM MOTOR DRIVER Characteristic Control Logic Logic Supply Voltage Range Logic Input Voltage Logic Input Current Reference Voltage Range Reference Input Current Reference Voltage Divider Ratio Comparator Input Offset Voltage PWM RC Fixed OFF Time PWM Minimum ON ...

Page 5

FULL-BRIDGE PWM MOTOR DRIVER INTERNAL PWM CURRENT CONTROL DURING FORWARD AND REVERSE OPERATION The A3952S– contains a fixed OFF-time pulse-width modulated (PWM) current-control circuit that can be used to limit the load current to a desired value. The value ...

Page 6

FULL-BRIDGE PWM MOTOR DRIVER Brake Operation - MODE Input Low During braking, with the MODE input low, the peak current limit defaults internally to a value approximated 1.5 V/R TRIP In this mode, the value of ...

Page 7

FULL-BRIDGE PWM MOTOR DRIVER The following procedure can be used to evaluate the worst-case slow-decay internal PWM load current regula- tion in the system: Set volts. With the load connected and the PWM REF current control ...

Page 8

FULL-BRIDGE PWM MOTOR DRIVER imply that output short circuits are permitted. The hyster- esis of the thermal shutdown circuit is approximately the internal current-control circuitry is not used; the V terminal should be connected to V ...

Page 9

FULL-BRIDGE PWM MOTOR DRIVER PCB Layout The load supply terminal (>47 F electrolytic and 0.1 F ceramic capacitors are recommended) as close to the device as is physically practical. To minimize the effect of system ground I•R ...

Page 10

FULL-BRIDGE PWM MOTOR DRIVER motor is more linear than in the case of ENABLE PWM control (which produces a discontinuous current at low- current levels). With bidirectional dc servo motors, the PHASE termi- nal can be used for mechanical ...

Page 11

FULL-BRIDGE PWM MOTOR DRIVER 16 0.280 0.240 1 0.070 0.045 0.210 MAX 0.015 MIN 0.022 0.014 7.11 6.10 5.33 MAX NOTES: 1. Leads and 16 may be half leads at vendor’s option. 2. Webbed lead frame. ...

Page 12

FULL-BRIDGE PWM MOTOR DRIVER NOTES: 1. Index is centered on “D” side. 2. Webbed lead frame. Leads indicated are internally one piece. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor’s option within limits ...

Page 13

FULL-BRIDGE PWM MOTOR DRIVER 0.2992 0.2914 0.020 0.013 0.0926 0.1043 7.60 7.40 0.51 0.33 2.65 2.35 NOTES: 1. Webbed lead frame. Leads indicated are internally one piece. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration ...

Page 14

FULL-BRIDGE PWM MOTOR DRIVER INDEX AREA 0.065 0.035 INDEX AREA 1.65 0.89 NOTES: 1. Lead thickness is measured at seating plane or below. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor’s option within ...

Page 15

FULL-BRIDGE PWM MOTOR DRIVER ...

Page 16

FULL-BRIDGE PWM MOTOR DRIVER Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein ...

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