L6256 datasheet(1/28 Pages) STMICROELECTRONICS

部件名	L6256

功能描述	12V COMBO

PDF	28 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 28 page

L6256

12V COMBO

DESCRIPTION

The 12 Volt Combo chip is a combination spindle

motor driver, voice coil driver and D/A converter.

The part can be used in,application like HDD.

The VCM amplifiers drive a low impedance coil

and are set up to accept RC compensation, which

allows a wide bandwidth with absolute minimum

phase lag. The sense resistor/amplifier arrange-

ment allows full current loop operation. The loop

gain is changeable by attenuating the VCM DAC

voltage amplitude in cascadable stages.

The Spindle driver is a PWM only voltage loop

with power supply feedforward, driving a 3 phase

sensorless brushless DC motor. Since it uses

PWM operation at full run speed, it has output

slew rate control during start and run modes.

There is an inductive clamp circuit to limit flyback

voltage transients across the supply voltage dur-

ing motor phase changes and during the braking

sequence. Only the 2 phase or bipolar commuta-

tion pattern is produced by the internal commuta-

tion circuitry. A commutation register allows arbi-

trary winding sequencing during certain opera-

tions.

Internal protection against crossover

spikes is built in.

3 phase or tripolar commutation can be supported

in software during start by writing a commutation

pattern directly to the preload register.

Tripolar operation requires that more than two

phase drivers contribute current simultaneously.

The current limit circuitry reflects this and allows

33% higher current limit, which produces nearly

December 1997

CHARGE

PUMP

VPWR

2

UV

DETECT

POR

VCM

COMMAND

CHANNEL

10 BIT

DAC

VCM

RETRACT

VCM CONTROL

CLK

SYNC

SERIAL INTERFACE

BANDGAP

VOLTAGE

REFERENCE

CURRENT

SOURCES

SPINDLE LOGIC

SPINDLE SEQUENCER

ANALOG

TEST MUX

3

24

3.3V LINEAR

REGULATOR

3

FEEDFORWARD

COMPENSATION

VCM

LOGIC

THERMAL

h_vpwr

+

-

A

AMP

+

-

B

AMP

A_OUT

B_OUT

BRAKE

DELAY

COUNTER

BEMF SENSING

ZERO CROSSING

DETECTION

PWR GND

VCM CLASS AB

DRIVERS

R_

SLEW

PWM_

IN

PWM_

DC

FF_

COMP

SP_

CLK

upper

lower

PRE-DRIVERS

DYNAMIC

CLAMPING

SPINDLE DRIVERS

CURRENT

LIMIT

SENSING

SH_

OUT

BEMF_

DET

SP_

G2

SP_

G1

REF_

IN

C_TAP

SP_C

SP_B

SP_A

SP_P2

SP_P1

VC_PWR

A_IN

I_VC

IO_VC

DAC

CP_OUT

CP_CAP

H_VPWR

VDD

VCC

nPOR

POR_RC

PARK

SCLK

SDIO

CSELB

BYPASSC

QDRIVE

VREG_IN

CUR_IN

6,7,17,29,39,40

8

11

36

37

5

38

12

35

44

4

41

3

1

43

42

2

24

23

25

30

26

31

32

18

19

33

34

15

10

9

27

13

14

28

16

20

21

22

D97IN571

SYNC

CLAMP

Figure 1. Block Diagram

PLCC44

ORDERING NUMBER: L6256

1/28

类似零件编号 - L6256

制造商	部件名	数据表	功能描述
STMicroelectronics	L6254	109Kb / 17P	12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL "COMBO? April 1999
	L6258	215Kb / 18P	PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER Apr-2000
	L6258	314Kb / 32P	PWM controlled high current DMOS universal motor driver 22-Nov-2007
	L6258E	216Kb / 24P	PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER Sep-2004
	L6258E	308Kb / 31P	PWM controlled high current DMOS universal motor driver 03-Dec-2007

More results

类似说明 - L6256

制造商	部件名	数据表	功能描述
Astec America, Inc	DS650-3	100Kb / 4P	650 Watts 12V
Astec America, Inc	DS850-3	100Kb / 4P	850 Watts 12V
AAEON Technology	EMB-BT1	406Kb / 2P	12v dc power
Suntan Capacitors	TSS-TC-0402	132Kb / 1P	RATING:DC 12V 50mA
	TSS-TC-1102	115Kb / 1P	RATING:DC 12V 50mA
	TSS-TC-1193	103Kb / 1P	RATING:DC 12V 50mA
	TSS-TC-12XT	73Kb / 1P	RATING:DC 12V 50mA
Leshan Radio Company	LP2323LT1G	424Kb / 3P	12V P-Channel Enhancement MOSFET VDS =-12V
Maxim Integrated Produc...	MAX761EVKIT	353Kb / 4P	2V to 12V Input Range for 12V Output 2007
Rosenberger Hochfrequen...	M2K211-1AE	799Kb / 2P	POWERSYSTEM CLIP 12V