L7200 데이터 시트보기 (PDF) - STMicroelectronics

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L7200

MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO”

STMicroelectronics 

L7200

DESCRIPTION (continued)

Power On Reset (POR) circuitry is included. Upon detection of a low voltage condition, POR is asserted, the

internal registers are reset, and spindle power circuitry is tri-stated. The BEMF is rectified providing power for

actuator retraction followed by dynamic spindle braking. Three Linear regulators and a Shock Sensor circuitry

are also integrated.

The device is built in BCD mixed signal technology allowing dense digital/analog circuitry to be combined with

a high power DMOS output stage.

BLOCK DIAGRAM

PUMP

VREG3.3_IN

VREG2.5_IN

VREG8_DRV

VREG8_IN

SDATA

SCLK

SDEN

TR_12V

TR_5V

TR_3.3V

CHARGE

PUMP

3.3V

Regulator

2.5V

Regulator

8V

Regulator

SERIAL

PORT

SHOCK

DETECTOR

FLL &

DIGITAL

FILTER

INDUCTIVE

SENSE

START-UP

REGISTERS

BIPOLAR /

TRIPHASE

RE-SYNC

DYNAMIC/

REVERSE

BRAKE

VCM

PSM/LIN

VCM

CALIBRATION

SPINDLE

Architecture

PWM A

PWM B

ISOFET

PWM C

BEMF

DETECTION

RAMP LOADING

BEMF

RECTIFICATION

SUPPLY

FAULT

MONITORS

THERMAL

SUPPLY

14 BIT

VCM DAC

REFERENCE

VOLTAGE VCC/4

& GAIN SWITCH

A=4

VCC

OUT_A

CTAP

OUT_B

OUT_C

RSENSE

ISENSE

VCM_A+

VCC

VCM_A-

VCM_GND

SENSE_IN-

SENSE_IN+

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