Part number : TDA5247, TDA5247HT
Functions : Chip for Quantum HDD Logic Board
Package information : QFP 80 Pin Type
Manufacturer : Philips
Chips used to drive spindle motor (3 phase brushless DC) are Philips TDA5247HT or Panasonic AN8428GAK.
TDA5247HT, Philips, spindle motor + VCM controller
possible replacement for TDA5247HT = Panasonic AN8428NGAR
Reference site :
TDA5247 Datasheet PDF
Reference Datasheet PDF : AN8428GAK, Driver for 3.5inch HDD motor
AN8428GAK is motor comb IC for 3.5inch HDD. By new retract circuit ,reduce external components and shorten the brake time of the disk to improve reliability of HDD. Spindle motor sensor less linear drive.
VCM linear drive , PWM-DAC control. Built-in Retract , 12 V/5 V/3.3 V power monitor, 3.3 V-Regulator.
80-pin TQFP package with exposed heat think.
1. By new retract circuit ,reduce external components and shorten the brake time 1/2 of the disk to improve reliability of HDD.
2. Built-in shock sensor amplifier for mechanical shock protection and 3.3 V regulator for logic semiconductor.
3. 10 dB acoustic noise reduction by trapezoidal current on spindle motor drive .
4. 80- pin TQFP package with the smallest thermal resistance in the industry. Meet to increase speed of HDD higher 30 % than previous.
(1) Spindle motor sensor less linear drive :2.7 A peak current drivers , Ron=1.1 Ω
(2) VCM linear drive : 1.8 A peak current , Ron=1.5 Ω
(3) Retract function exists
(4) Built in 12 V/5 V/3.3 V power monitor
(5) Built in shock sensor amplifier
(6) Built in 3.3 V regulator
3.5 inch HDD