A8932CLWA Allegro Micro Systems, Inc., A8932CLWA Datasheet

A8932CLWA

Manufacturer Part Number

A8932CLWA

Description

Voice-coil motor driver

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A8932CLWA.pdf (8 pages)

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Part Number:

A8932CLWA

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ALLEGRO

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RETRACT

GROUND

Supply Voltages, V

Output Current, I

Analog Input Voltage Range,

Logic Input Voltage Range,

Package Power Dissipation,

Operating Temperature Range,

Junction Temperature, T

Storage Temperature Range,

† Fault conditions that produce excessive junction

temperature will activate device thermal shutdown

circuitry. These conditions can be tolerated, but

should be avoided.

Output current rating may be restricted to a value

determined by system concerns and factors.

These include: system duty cycle and timing,

ambient temperature, and use of any heatsinking

and/or forced cooling. For reliable operation the

specified maximum junction temperature should

not be exceeded.

RET REF

SWITCH

SUPPLY

SIGNAL

OUT

FAULT

RESET

OUT P

BEMF

OUT

SET

FLT

(continuous) ...........................

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

..................................... 0 C to +70 C

................................ -55 C to +150 C

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

............................... -0.3 V to +6.0 V

PROTECT

CIRCUIT

–

REF

OUT

2 V

–

(peak) ........... 600 mA

and V

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

–

............ 6.0 V

500 mA

RET SET

SGND

OUT

LOAD

SUPPLY

OUT

SGND

ACT

PWR OFF

H GAIN

REFERENCE

ACT

SENS

SENS FB

Dwg. PP-042B

LOAD

†

8932-A

positioning in 5 V disk drive applications, the second-generation

A8932CLWA is a full-bridge driver that can be configured so that its

output current is a direct function of an externally applied control

voltage or current. This linear current control function is supplemented

by additional circuitry to protect the heads and the data disk during

system failure or normal system shutdown.

voltage and minimal power dissipation. Additional headroom is

achieved by the sense-FET structure eliminating the need for an exter-

nal current-sense resistor. Internal circuitry can be configured to

provide closed-loop velocity control of the actuator by utilizing the

generated back-EMF of the voice-coil motor. Thermal protection and

under-voltage lockout disables the system in a controlled sequence if a

fault condition occurs.

Always order by complete part number, e.g., A8932CLWA .

Class-B, 2

Lossless Current Sensing

Zero Current-Loop Deadband

High Transconductance Bandwidth

User-Adjustable Transconductance Gain

Digital Transconductance Gain Switch (4:1 Ratio)

5 Volt Monitor with Selectable UV Trip Point

Retract Circuitry Functional to 0 Volts

Sleep Mode Function

Internal Back-EMF Velocity Loop Option

Internal Thermal Shutdown Circuitry

Providing control and drive of the voice-coil motor used for head

The two 500 mA MOS driver outputs provide very low saturation

VOICE-COIL MOTOR DRIVER

DS(on)

at 500 mA Output

Related parts for A8932CLWA

A8932CLWA Summary of contents

Page 1

... VOICE-COIL MOTOR DRIVER Providing control and drive of the voice-coil motor used for head positioning disk drive applications, the second-generation A8932CLWA is a full-bridge driver that can be configured so that its SENS output current is a direct function of an externally applied control LOAD voltage or current ...

Page 2

VOICE-COIL MOTOR DRIVER 19 ACT FB 15 ACT 16 REFERENCE 17 H GAIN 18 PWR OFF 12 FAULT PROTECTION CIRCUITRY 13 MP RESET 5 2.0 1.5 1.0 0 100 AMBIENT TEMPERATURE IN C SIGNAL LOAD ...

Page 3

Characteristic Error Amplifier Input Offset Voltage Current Gain Current Gain Linearity Reference Voltage Range Voltage-Sense Amplifier Voltage Gain Output Offset Voltage Current-Sense Amplifier Amplifier Error Input Offset Voltage Output Drivers Total On Resistance (Source + Sink) Retract Output Voltage Error ...

Page 4

VOICE-COIL MOTOR DRIVER Characteristic Miscellaneous Supply Voltage Under-Voltage Lockout Voltage Fault Logic Output Power-On Reset Total Supply Current Logic Input Voltage Thermal Shutdown Temperature Thermal Shutdown Hysteresis Negative current is defined as coming out of (sourcing) the specified device ...

Page 5

Term. Terminal Name 1 RET REF 2 V FLT 3 V BEMF 4 GROUND 5 UV SET 6 R OUT P 7 OUT 8 SWITCH OUT SW 11 RETRACT 12 FAULT 13 MP RESET 14 SIGNAL ...

Page 6

... VOICE-COIL MOTOR DRIVER Current Amplifier. The A8932CLWA voice-coil motor driver features a wide transcon-ductance bandwidth and minimal crossover distortion. The transconductance gain is user selectable where A is either 2000 (H GAIN = Low) or 8000 (H GAIN = i High). The error amplifier’s bandwidth and load compensa- tion zero are set utilizing external resistor and capacitor feedback components around the amplifier ...

Page 7

... Operation down to almost 0 V requires an energy-storage capacitor at the Protective Features. The A8932CLWA has a number of protective features incorporated into the design. Under- voltage lockout provides system protection in the event of reduced primary supply voltages. The under-voltage trip point is internally set at approximately 4 can be ...

Page 8

VOICE-COIL MOTOR DRIVER 28 0.2992 0.2914 0.020 1 0.013 0.0926 0.1043 0.0040 28 7.60 7.40 0.51 1 0.33 2.65 2.35 0.10 NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor’s option within limits ...

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