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TDA5345HT Fiches technique(PDF) 29 Page - NXP Semiconductors

No de pièce TDA5345HT
Description  5 V spindle & VCM driver combo
PDF  44 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA5345HT Fiches technique(HTML) 29 Page - NXP Semiconductors

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1999 June 10
29
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
The PorN output can also be driven by the retract sequence manager:
If there is a power supply failure at the sequence start-up or during the sequence, PorN will be kept low during all the
programmed sequence, what ever the supply is restored or not.
Caution !!
It is not allowed to wake the VCM up ( VcmSleep = ‘0’’) if the spindle is not on speed, because a retract sequence would
start on a power supply failure without any clock (generated from the spindle back-EMF). PorN would be maintained low
by the retract manager, waiting for clock pulses.
Fig.23 Glitch detector timing
t
Supply
∆V
Tc
t
t
PorN
Por5Adj signal
Vref=1.23V
with a capacitor
5V
0V
VCM-
FCK136
Tc
PorN
Vdd5
4.1V
Fig.23



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