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| TDA5345HT Datasheet, PDF (25/44 Pages) NXP Semiconductors – 5 V spindle & VCM driver combo | |||
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Philips Semiconductors
5 V spindle & VCM driver combo
Preliminary speciï¬cation
TDA5345HT
VCM+
SOFT RISING
VCM-
BRAKE SOFT RETRACT FULL POWER
BRAKE DELAY
Fig.17 The states for the VCM retract
FCK135
Spindle brake after retract sequence :
In case of power down, an emergency procedure is initiated by the PorN signal : the spindle back-EMF is synchronously
rectified to supply the VCM ramp unload function. At the end of the full power step, a spindle short-circuit brake is
activated (SpinMotA, SpinMotB & SpinMotC are together short-circuited to ground). It is supplied by an external reservoir
capacitor connected to pin BrakePower (60).
Shock sensor ampliï¬er:
A complete circuitry is included on-chip to control an external shock sensor.
Figure 14 shows a typical application diagram:
1999 June 10
25
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