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| www..com LD7000 Spindle/VCM Controller and Pre-driver DESCRIPTION The LD7000 Servo and Spindle Predriver, a CMOS monolithic integrated circuit housed in a 64-lead TQFP package operates from +5 V and +12 V supplies. It is designed to drive a voice coil actuator and a 3-phase, Hall-sensorless motor with external power MOSFETs. The device is intended for use in 12 V disk drive applications. The actuator driver includes a saturation detector to monitor the loop compensation amplifier for saturation, an uncommitted opamp for input signal conditioning, a voltage reference to provide a precise voltage level for internal PWM buffers, and reduced power dissipation. The spindle driver includes a P controlled startup ramp to replace the imprecise analog ramp, an external PWM input to allow PWM frequencies above the audible range, active pullup on the P driver, adjustable N-channel slew rate, and improved spindle brake performance. A precision low voltage monitor circuit is also added .com to monitor +5 V and +12 V supplies and to initiate servo head retracts during voltage faults. All functions are controlled by an SSI compatible read/write serial port. Three DC-DC converter circuits for 2.5V,3.3V,&-3/5Vsupplies are also available for digital chips and MR bias negative supply. FEATURES * * * * * * * * * Small footprint 64 or 48 pin TQFP package Spindle driver is PWM during run and start Commutator is driven by a phase lock loop for high jitter immunity Adjustable slew rate to minimize stress in the power MOSFETs Microprocessor controlled spindle startup Saturation detector to monitor loop compensation amplifier status Precision low voltage monitor circuitry for both +5 V and +12 V supplies, LD7000 only Dual level retract scheme includes adjustable pulse mode, LD7000 only Serial Port control DataShee .com version 2.1 www..com LD7000 Spindle/VCM Controller and Pre-driver OUTB OUTA VP SATB N/C SOUT SE1 SE2 VNA ERR ERRM N/C 37 38 39 40 41 42 43 44 45 46 47 48 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 VREF A3 A3N A3P RETRB BRAKEB CVCO SDEN SDAT SCLK RVCO RC 48-Lead TQFP LD7000 SE3 OUTC OUTD N/C CBRAKE RSR P1 P2 P3 N1 N2 N3 24 23 22 21 20 19 18 17 16 15 14 13 VND VP VCC SENSOR DISPWRB PWMIN ADVANCE RESET ENABLEB COS ISENSE RPH SE3 OUTB OUTA MARGINB VP RL RM SOUT VR2 SOLS SE1 SE2 VNA ERR ERRM IM t4U.com .com 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 VREF A3 A3N A3P SATB RETRB BRAKEB CVCO V5 VBG VCCHKL VCCTH SDEN SDAT SCLK RVCO 64-Lead TQFP LD7000 OUTC OUTD IL CBRAKE RSR VCCHKH V12CHK V12 P1 P2 P3 N1 N2 N3 VND VP This document may contain preliminary information and is subject to change by LDIC without notice. LDIC assumes no responsibility or liability for any use of this information herein. Nothing in this document shall operate as an express or implied license of indemnity under the intellectual property rights of LDIC or third parties. NO WARRENTIES OF ANY KIND, INCLUDING, BUT NOT LIMITED TO, THE IMPLIES WARRENTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE OFFERED IN THIS DOCUMENT. 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 FAULTB WRINHB VCC SENSOR DISPWRB PWMIN ADVANCE RESET SE1R VPSNS ENABLEB COS RETRD ISENSE RPH RC .com Page 19 version 2.1 |
Price & Availability of LD7000
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