5 V Spindle & Vcm Driver Combo

The TDA5345HT is a combination of a voice coil motor and a spindle Motor Driver designed for 5 V high performance portable small form factor hard disk drives. Communications with the micro-controller take place through a 16-bit 3-wire uni-directional serial port. Power dissipation is a major concern in portable drives, therefore each main function CAN be individually put in sleep mode when it is not used, to save as much power as possible. The serial port and the power monitor are the only functions which remain always active. The TDA5345HT integrates a spindle driver and the commutation Logic that drives a three-phase brushless, sensorless DC motor in full wave mode. Commutations are generated from the internal back-EMF sensing circuitry from start-up to the running mode. An internal speed loop combining FLL and PLL technics makes sure that the spindle reaches the right speed, programmed through the serial port. The 6-bit DAC is used to limit the Start-up current by limiting the voltage on the speed loop Filter To reduce acoustical noise and current noise on both power supply and ground, the fly-back pulse leading edge slew-rate is controlled. 4 different slope values are programmable. To prevent internal parasitic effects, positive and negative fly-back pulses are clamped by the output Power Transistors themselves: lower NMOS Transistors are turned ON to limit the negative fly-back pulses just below ground while upper PMOS limit the positive fly-backs just above the power supply. This active limitation is still active at power down during the VCM retract. In this way, an efficient back-EMF rectification is obtained (no Diodes losses). By NXP Semiconductors
TDA5345HT 's PackagesTDA5345HT 's pdf datasheet



TDA5345HT Pinout, Pinouts
TDA5345HT pinout,Pin out
This is one package pinout of TDA5345HT,If you need more pinouts please download TDA5345HT's pdf datasheet.

TDA5345HT Application circuits
TDA5345HT circuits
This is one application circuit of TDA5345HT,If you need more circuits,please download TDA5345HT's pdf datasheet.


Related Electronics Part Number

Related Keywords:

TDA5345HT Pb-Free TDA5345HT Cross Reference TDA5345HT Schematic TDA5345HT Distributor
TDA5345HT Application Notes TDA5345HT RoHS TDA5345HT Circuits TDA5345HT footprint