TA8421AF

TA8420AF TOSHIBA | Alldatasheet

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TOSHIBA TA8420,21AF TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC TA8420AF, TA8421AF

1 CHIP DC FAN MOTOR DRIVER

The TA8420AF and TA8421AF are fan motor drive ICs. The output current for these ICs is 1.0A (average). The ICs incorporate all functions necessary for fan motors. By substantially reducing peripheral components, the ICs save space and enhance miniaturization. d TA8420AF has an FG output Pin (outputs FG signals in Say proportion to the number of rotations). TA8421AF has an Ls Ul’ ite RD terminal that detects the state of the motor (that is, UKs ~ rotating or stopped). In other respects, the two ICs are the same. SSOP10-P-225-1.00 Weight : 0.09g (Typ.)

FEATURES

@ Build-in Lock Sensing Circuit (Over Heat Protector for Drive Coil). @ Build-in Automatic Self Rotation Recovery Circuit After Release of Motor Locking. © Operating Voltage : Vcc (opr) =4~15V @ Output Current : lo =1.0A (AVE) @ Thermal Shutdown Circuit Incorporated. @ Suitable for Super Micro Fan Motor. © Surface Mountable MFP 10 Package Sealeded. @ Less External Component. @ TA8420AF has FG (Frequency Generator) Out for Rotation Speed Sense and TA8421AF has RD (Rotation Detect) Out for Rotate or Stop Sense. 961001684 @ TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent products specifications. Also, please keep in mind the precautions and conditions set forth in the TOSHIBA Semiconductor Reliability Handbook. Sire products described in this document are subject to foreign exchange and foreign trade control laws. The information contained herein is presented oniy as a guide for the applications of our products. No responsibility is assumed. by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. @ The information contained herein is subject to change without notice. 1997-08-28 1/11

TOSHIBA TA8420,21AF BLOCK DIAGRAM Rsc o © O) ceo 3 FG Rsc (TA8420AF) {2 Vz=28V MIN. coun sau bown | | ¥2 Qin ous | INA [ha a F ous | fi J ot ge | orm 4 ‘Lee &9d @ oh PIN FUNCTION | PIN No. | SYMBOL FUNCTIONAL DESCRIPTION R Constant Current determine terminal. (for Lock SC Protect Circuit) [3 [PG | Power 6ND. [4 [outs output terminal SSSSC—~S™ Signal GND. FG (TA8420AF) |Rotation speed output terminal. RD (TA8421AF) | Rotation detect output terminal. Power voltage supply terminal. [8 | _1Na___|all input terminal. [9 | _1NB [Hall input terminal. Lock protect time constant determine terminal. 8997-08-28 O/T

TOSHIBA TA8420,21AF OPERATION OF AUTOMATIC SELF RECOVERY CIRCUIT If Motor Rotation is distorted by external force or obstacles, Over Current, which have a possibility of Drive Coil Burning, is generated by decreasing of Back Electron Motive Force (BEMF). Therefore, Over Heat Protection of Drive Coil is required for Fan Motor Drive System. Generally, Series Connection of Temperature Dependence Elements (Posistor) to Output Drive Coil or to use drive IC incorporates protection circuit are required to get coil burning protection. Posistor is so expensive, therefore, IC’s incorporate this function are coming into wider use for Fan Motor Drive in recent years. Generally, re-switch operation after the turn on of protection circuit is required for system start up again because the circuit is constructed by flip-flop circuits. But there’s no use re-switch operation with TA8420AF, TA8421AF because of build-in automatic self recovery circuit. Fig.1 shows pin@® voltage and the operation of this functions are as follows. 1. Normal rotation states Internally generated charging current of Is, (0.25/A Typ.) charge-ups external capacitance of Csc connected to pin®. But FG pulse, generates among in rotation states and the frequency is proportional to rotation speed, discharges CL charge periodically. Therefore, voltage of pin is becoming sawteeth waveform and will not to reach Vsc of limiting voltage (1.3V Typ.). 2. Motor lock states If a Motor is locked by external force or obstacles, internal FG pulse generation is stopped. As a result, the voltage of pin@® increase. Torque generation is stopped after when the voltage of pin@® reaches to Vsc Further more, voltage of pin® is increased by charging current of Is, toward the Vscr of self recovery voltage (2.9V Typ.). And then the pin@® voltage reaches to Vscr. Automatic self recovery circuit operates and generates a momentary torque (top = 200ms. Typ.). But Motor can not start own rotation if the Motor is still locked by external force or obstacles. In this period, voltage wave form of pin@® is becoming sawteeth that peak is Vscr and Bottom is Minimum DC level of approximately 0.7V. 3. After release of motor lock Pin@® voltage can not reaches Vsc level after release of Motor lock because of discharging operation of Csc. 1997-08-28 3/11

TOSHIBA TA8420,21AF RD OUTPUT (TA8421AF ONLY) Veo Vscr (2.9 Typ.) oI = 2 ROTATION LOCK e / F jf |/ | | 7 A WWW. mamuwunt oe Level (som HERO FORGE Fig.1 Automatic Self Rotation Recovery Circuit Operation @ FG output (TA8420AF) and RD output (TA8421AF) FG output terminal of pin@ of TA8420AF outputs a rotation speed proportional FG signals with open collector mode. This FG signal duty and mode are all the same to output A (pin@). RD output terminal of pin@® of TA8421AF outputs a state signals (Rotate or Stop). RD output becomes low (Actually Vsat (RD) level of 0.3V Typ.) when the Motor in rotation state and generates to¢¢ pulse when the rotation is locked (Refer to Fig.1). 1997-08-28 4/11

TOSHIBA TA8420,21AF @ Recommended operating conditions TA8420AF, TA8421AF are designed for 5, 12V operating voltage use. Please refer to Fig.2 of Recommendation Operating Region. LAT TE Ty [zane] re a ae nS 2 {yr e {iit sot LLL IT eT o 02 PEt ttt tet te atti tTi iti ttt | 0 10 «2030 a ———_ COIL REACTANCE L (mH) Fig.2 Recommendation operating region @ Transient thermal resistance. = on Bat scl torte pee EE en Ze cl lean = of | TT wc 7 | g *E TTT CA Toei TTT e i | TU? Ti TT TT 5 pe tlic [Pp Hl Sage IT TTT TTT) gs ~ TT Tin Tiny \\ o_l TTY fF Titi tT Ti on 0305 = (1 3° 5 10 30 50 100 Fig.3 Transient thermal resistance (Single pulse condition) 1997-08-28 5/11

TOSHIBA TA8420,21AF © Hall input terminals (Pin®, ©) Operating DC Level of Hall Inputs (Pin®, @) are 2.5~Vcc -0.8V as specified. If the voltage appeared at Hall Sensor output terminal within this range, there’s no requirement of external connecting level shifting resistor. But Ra, (or Ra and Rb) is required to connect series with Hall sensor if this is not. Vee Ra Yas rb+ Bd RE 2.5 (VS Vcc RaaRb+Rd Vcc - 0.8 (V) Ro, Rd : Dynamic Resistance of Hall Sensor. e We recommend to connect noise suppression use capacitance between IN A and IN B for stable operation. 1997-08-28 6/11

TOSHIBA TA8420,21AF MAXIMUM RATINGS (Ta = 25°C) CHARACTERISTIC SYMBOL RATING UNIT Output Terminal Breakdown Vv v Voltage Pin@, @, © CER Operating Supply Voltage IO (AVE! Output Current 10 (PEAK) [2.0 (Note 1) FG Output Current (TA8420AF) | Ig _| 20 (Note 1)| ma RD Output Current (TA8421AF)| IRD _| ore Hall Input Voltage 300 (Note 2) [Power Dissipation | Pp | 735 (Note 3) Operating Temperature -30~85 Storage Temperature =50~150 (Note 1) t=0.1s (Note 2) j= -25~150°C (Note 3) This value is obtained by 50x50x 1.6mm PCB mounting occupied in excess of 30% of copper area. ELECTRICAL CHARACTERISTICS (Ta = 25°C. Vcc =12V. Rgc=910kM, Cgc =0.16 uF) TEST CHARACTERISTIC SYMBOL TEST CONDITION an. |v. | max UNIT CUIT : Vec=5V, OUTA “ON” [3.0 [| 5.2] 7.5 | Output Saturation Voltage VSAT Igo 0A T= 25°C b=} 10120] v Automatic [Charge Cure’ |i, |=] — +) — | o2s[ — | A | Rotation [Recovery Voltage] Vscr_ [—[ | [29] — | Circuit [Duty Ratio | DR | — [tort /ton, T= -25~150°C] 3 [5] 9 | — | [Sensitivity [| Vu | — [Including off set }— | — |] 7] mv | Operating DC _ 160% Hall Input [Level (Lower) | cw | | T= 7257 150°C | - | - | ast Operating DC _ EN Vec Level (Upper) CMRH | - | Tj= = 25~150°C -0.8 FG Output Saturation RD Output Saturation _ Voltage (TA8421AF) Vsat (RD) | - | IRD =5mA ae [=P Tel T= TI Temperature 1997-08-28 7/11

TOSHIBA —C—‘“‘CSCSCSCSCSCSCSCSC#‘TAQ8442.0,21,AF TEST CIRCUIT sw © sw 1k vec O oe g ° g a: =z ~ g Q Q © fi . me Pc Forno (Vsar (FG), (RD)) “NG na outa 2-5 g [| TA8420AF /21AF bo” Tor] Noy ine ours [4 <° sw Dosw ec sc - ¢ s G) G) © Wsan o~22v Es rg ® sv | S “se i ® wse, vsew FUNCTION L_w [our ® ©) 2) @) [| Mover | H | Lt | ON | OFF | L_move2z [| i [| oF | on | TT OO Hh TT

TOSHIBA TA8420,21AF 3 Icc - Vec 16 VsaT - !O ovum TT TT TT | vee | | [| | | [ee TT ee] Mfwee PTT Ea 6 —r. 12 | ee iste | s af LLL LT TT z > = > vec= can = Oia Bo ert IB 2 of I a ° g 3 E ri i$ & : g s 02 gE oh wi | | | Es i td ow J 0 2 4 6 8 10 12 14 16 18 20 0 02 04 06 08 10 12 14 16 18 20 vec ™) lo A (F6) LOCK DETECT CIRCUIT OPERATING TIME VsaT (FG) - IFG ~ Rsc ora vena | dd Teco FA Cc Vec=12v SC Te mae sie sooo 2 PEPE TTY fron el [3 ee ee = ong conp Ox eo ELEC er EE lite | hare” | | do-| 5 Eee g fe ty nome E of TT eA & ol ——eav - CCA E Lert TT | wo EAE oO Pa] pa Ear Banee= a LUE 0 1 2 3 4 5 6 7 8 9 10 0 100k 200k 300k 400k 500k 600k 700k 800k 900k 1M leg (mA) Rsc (Q) (Note) RD Output is same characteristic. 1997-08-28 9/11

TOSHIBA TA8420,21AF APPLICATION CIRCUIT Vec=5, 12V g 2) @ © | | —a ® Te | TA8420AF /21AF > t , S i ' wore 3) bo Eto. ©) G) ' 1 1S1555x2 S H i } aoa (Note 1) There’s no requirement of this diodes in normal applications. But if the Vcc is more than 14V or use large value of coil reactance, we recommend to connect this diodes. (Note 2) There’s no requirement of this capacitance in normal applications. But connection 0.47~10.F of this capacitance increases a stability of operation. (Note 3) This capacitance is for noise suppression use. Connect if required. (Note 4) We recommend to connect capacitance between each output and GND (or out ® and ©), to suppress Rrj and noise problems. (Note 5) Utmost care is necessary in the design of the output line, Vcc and GND line since IC may be destroyed due to short-circuit between outputs, air contamination fault, or fault by improper grounding. (Note 6) In case of large mutual inductive value between La and Lb. Diodes (or CR) are required to restrict parasitic oscillation caused by negative electro-motive force generated by inductive mutual effect between La and Lb. (a) (b) M Lb —— 3 © iO) coR Q Po F 10~200 10~: g 191555x2 p— x > > 1997-08-28 10/11

TOSHIBA TA8420,21AF OUTLINE DRAWING SSOP10-P-225-1.00 Unit : mm 10 6 HHHHH - S al] = §| 8 & tl 6 a iii HHH S 5.7MAX 5.240.2 a x 3 x 2 ctr 3 cag S 0.525+0.2 Weight : 0.09g (Typ.) 7997-08-28 11/11