TA8420AF

The TA8420AF and TA84Z1AF are fan motor drive ICs and the output current for these ICs is 1.0A (average). TA8420AF has an FG output Pin (outputs FG signals in proportion to the number of rotations). TA8421AF has an RD terminal that detects the state of the motor (that is, rotating or stopped). The ICs incorporate all functions necessary for fan motors. By substantially reducing peripheral components, the ICs save space and enhance miniaturization. In other respects, the two ICs are the same.

The features of TA8420AF can be summarized as (1)build-in lock sensing circuit (over heat protector for drive coil); (2)build-in automatic self rotation recovery circuit after release of motor locking; (3)operating voltage : VCC(opr)=4~15V; (4)output current : Ig=1.0A (AVE); (5)thermal shutdown circuit incorporated; (6)suitable for super micro fan motor; (7)surface mountable MFP 10 package sealeded; (8)less external component; (9)TA8420AF has FG (frequency generator) out for rotation speed sense and TA8421AF has RD (rotation detect) out for rotate or stop sense.

The absolute maximum ratings of TA8420AF are (1)output terminal breakdown voltage pin@, CER: 28V; (2)operating supply voltage VCC(opr): 15V; (3)output current IO(AVE.)/IO(PEAK): 1.0/2.0A(NOTE1: t=0.1s); (4)FG output current (TA8420AF) IFG: 20mA; (5)RD Output Current (TA84Z1AF) IRD: 20 (Note 1) mA; (6)hall input voltage VHM: 300 (Note 2: Tj = -25~150°C) mV; (7)power dissipation PD: 735 (Note 3: This value is obtained by 50x50x1.6mm PCB mounting occupied in excess of 30% of copper area.) mW; (8)operating temperature Topr: -30~85°C; (9)storage temperature Tstg: -50~150°C.