FAN8423D3TF Fairchild Semiconductor, FAN8423D3TF Datasheet
FAN8423D3TF
Specifications of FAN8423D3TF
Available stocks
Related parts for FAN8423D3TF
FAN8423D3TF Summary of contents
Page 1
... Other compact disk media spindle motor • Other 3-phase BLDC motor ©2000 Fairchild Semiconductor International www.fairchildsemi.com Description The FAN8423D3 is a monolithic IC, suitable for a 3-phase spindle motor driver of a CD-media system. 28-SSOPH-375SG2 Ordering Information Device Package FAN8423D3 28-SSOPH-375SG2 FAN8423D3TF 28-SSOPH-375SG2 Operating Temp + +75 C Rev. 1.0.1 Oct. 2000. ...
Page 2
FAN8423D3 Pin Assignments Pin Definitions Pine Number Pin Name GND 9 H1+ 10 H1- 11 H2+ 12 ...
Page 3
Internal Block Diagram GND Absolute Values Current Sense Output Amp Current Limit GND Rev. 1.0.1 Oct. 2000. FAN8423D3 ...
Page 4
FAN8423D3 Equivalent Circuits Hall Input Torque Control Input Start/stop Input 50 40K 23 30K Fg Output Vcc 10K Short Brake ...
Page 5
Absolute Maximum Ratings ( Parameter Maximum supply voltage (Signal) Maximum supply voltage (Motor) Power dissipation Maximum output current Operating temperature range Storage temperature range NOTE: 1. When mounted on a 76.2mm 114mm 2. Power dissipation reduces 16.6mW/ ...
Page 6
FAN8423D3 Electrical Characteristics (Unless otherwise specified Vcc Parameter Quiescent circuit current 1 Quiescent circuit current 2 START/STOP On voltage range Off voltage range HALL BIAS Hall bias voltage HALL AMP Hall bias current Common-mode ...
Page 7
Electrical Characteristics (Continued) Calculation of Gain & Torque Limit Current Current / Voltage Convertor + EC Gm ECR Absolute Values 0.255 is GM times R1 fixed value within IC. Vmax (see above block diagram) is set at350mV. VM ...
Page 8
FAN8423D3 Application Information 1. Torque Control & Output Current Control Torque AMP Ecr + - amplifying the voltage difference between Ec and Ecr from Servo IC, the Torque Sense AMP produces the input (V ) for the ...
Page 9
Short Brake Vcc OFF 20K Pin # 18 Short Brake High ON Low OFF When the pick-up mechanism moves from the inner to the outer spindle of the CD, the Brake function of the reverse voltage ...
Page 10
FAN8423D3 4. Tsd (Thermal Shutdown) When the chip temperature rises up to about 175 C, the Q2 turns on so that the output driver shuts down. When the chip tem- perature falls off to about 150 C, then the Q2 ...
Page 11
Therefore, the output of the rotational direction detector is Low, when the spindle rotates forward, while HIGH as in the case of the reverse rotation. 6. Reverse Rotation Prevention EC + ECR - H2+ + H2- - ...
Page 12
FAN8423D3 Rotating speed is decreased due to reverse torque at EC >ECR. (Motor still rotates forward) At the moment that the motor rotates in reverse, the reverse rotation preventer makes the output power transistor open. Rotating reverse at short time ...
Page 13
Connect A By-pass Capacitor, 0.1 f Between The Supply Voltage Source (1) The heat radiation fin is connected to the internal Gnd of the package. Connect that fin to the external Gnd. 25 Vcc 0.1uF Rev. 1.0.1 Oct. 2000. ...
Page 14
FAN8423D3 10. Input-output Timing Chart output current (H1 -)+( output voltage A2 output current (H2 -)+( output voltage A3 output current (H3 -)+( output voltage 14 Rev. ...
Page 15
Test Circuits 5V 12V IM3 A A IM2 10uA Rcs CS1 VM NC VCC SW1 SW2 VM8 RL=5 SW13 a ...
Page 16
FAN8423D3 Typical Application circuits HALL 1 HALL 2 HALL CS1 VCC A2 FG1X ...
Page 17
Rev. 1.0.1 Oct. 2000. FAN8423D3 17 ...
Page 18
... FAN8423D3 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...