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| BA6901F Motor driver ICs 2-Phase half-wave motor pre driver for fan motor BA6901F BA6901F is a 2-phase half-wave motor pre driver for fan motors. This IC has lock detection, and automatic restart functions as motor protection function. Variable speed control is possible by charge-discharge pulse circuit and PWM input. This IC incorporates current limit circuit, hall signal output pin, and alarm signal output pin. !Applications Fan motors !Features 1) Lock detection, automatic restart circuit. 2) Hall signal output. 3) Alarm signal output. 4) Current limit circuit. 5) PWM control (PWM pulse signal input). 6) Charge-discharge pulse circuit (Possible to control of variable speed by charge-discharge pulse circuit and PWM input). 7) Thermal shut down circuit. !Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Output current Signal output voltage Signal output current Junction temperature Symbol VCC Pd Topr Tstg IOUT VSO ISO Tjmax Limits 36 625 1 Unit V mW -25~+75 -55~+150 70 36 15 150 2 C C mA V mA C 1 To use at temperature above 25C reduce 5.0mW / C. (On 70.0mmx70.0mmx1.6mm glass epoxy board.) 2 This value is not to be over Pd and ASO. !Recommended operating conditions (Ta = 25C) Parameter Operating supply voltage Symbol VCC Min. 3.5 Typ. - Max. 28.0 Unit V 1/10 BA6901F Motor driver ICs !Block diagram CR 1 + - 16 TOUT HO 2 REG 15 VCC LOGIC AL 3 LOCK DETECTION & A2 14 A2 ALB 4 AUTOMATIC RESTART A1 13 A1 PWM 5 PWM - + 12 CL LD 6 + - 11 CS CNF 7 - + + - 10 H- GND 8 9 H+ !Pin descriptions Pin No. Pin name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CR HO AL ALB PWM LD CNF GND H+ H- CS CL A1 A2 VCC TOUT Function Connection terminal of capacitor and resistor for charge-discharge pulse circuit Hall signal output terminal Alarm output terminal Alarm output terminal (Reverse signal output of AL) PWM input terminal (H,OPEN : output ON, L : output OFF) Connection terminal of capacitor for Lock detection, Auto restart Connection terminal of capacitor for phase compensation GROUND terminal Hall signal input terminal Hall signal input terminal Current sence input terminal Current limit input terminal Output terminal Output terminal Power supply terminal Charge-discharge pulse output terminal 2/10 BA6901F Motor driver ICs !Input / output truth circuit Hall input VCC H+ H- Current limit input VCC PWM input VCC VREG 1.42V (Typ.) 30k (Typ.) 6.75k (Typ.) PWM CS CL 20k (Typ.) Output VCC Charge-discharge pulse output VCC A1,A2 TOUT Signal output HO,AL,ALB 3/10 BA6901F Motor driver ICs !Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 12V) Parameter Symbol Min. Typ. Max. Unit Conditions Circuit current Hall input hysteresis Charge current of capacitor for lock detection Discharge current of capacitor for lock detection Charge-discharge current ratio of capacitor for lock detection Clamp voltage of capacitor for lock detection Comparison voltage of capacitor for lock detection Output H voltage Hall signal outputn L voltage Alarm output L voltage CL-CS offset voltage Response time for current limit PWM input voltage H PWM input voltage L Charge-discharge pulse comparison voltage Charge-discharge pulse output voltage H Charge-discharge pulse output voltage L This product isn't designed for protection against radioactive rays. ICC Vhys ILDC ILDD rCD VLDCL VLDCP VOH VHO VAL VofsCS TCS VPWMH VPWML VCRCP VTOH VTOL 3.0 4 2.0 0.2 4 1.60 0.25 - - - 75.0 - 2.0 - 0.26 0.7 0.7 7.0 10 5.0 0.5 10 12.0 20 8.0 0.8 16 3.20 0.95 mA mV A A - V V V V V mV sec V V V V V At output : OFF VCOM=6.0V VLD=1.5V VLD=1.5V rCD=ILDC / ILDD 2.40 0.60 1.5 0.10 0.10 92.0 50 - - 0.35 1.0 1.0 2.0 0.50 0.50 99.5 150 - 0.8 0.44 1.3 1.3 IO=-10mA vs. VCC voltage IHO=5mA IAL=5mA, AL, ALB terminal CL=100mV At output : ON At output : OFF ITO=-0.5mA vs. VCC voltage ITO=0.5mA 4/10 BA6901F Motor driver ICs !Circuit operation *Lock detect circuit, automatic restart circuit Charge and discharge time at motor lock condition varies with the value of external capacitor at LD terminal, and is given by the following equation. Ton (Charge time) = C x (VLDCL-VLDCP) ILDC C x (VLDCL-VLDCP) ILDD Value of capacitor at LD terminal Clamp voltage of capacitor (2.40V Typ.) Typ.) Typ.) Typ.) Comparison voltage of capacitor (0.60V (5.0A Charge current of capacitor Discharge current of capacitor (0.5A Toff (Discharge time) = C VLDCL VLDCP ILDC ILDD : : : : : The following value shows charge time and discharge time at C=1.0F for reference. Charge time=0.36sec. Discharge time=3.60sec. (Output : ON) (Output : OFF) Shows timing chart of LD terminal. H+ A1 Toff Output Tr. OFF VLDCL LD VLDCP HIGH(Open collector) Ton ON AL ALB LOW HO Motor lock Detect lock Depend on the hall output Lock cancel Reset ordinary motion 5/10 BA6901F Motor driver ICs *CL, CS, CNF terminal Output current is limited by voltage (VCL) that inputting to the CL terminal. Resistor (RNF) of the output current detection is connected between emitter of the external output transistor and GND, and output current is detected by inputting the voltage which occurred in that resistor to the CS terminal. Output current is restricted as the electric potentials of the CL and the CS terminals are equal. But, there is offset between the CL terminal and the CS terminal. Value of current limit is found by the following equation. Value of current limit = VCL-VCL_CSofs RNF VCL_CSofs : Offset between CL terminal and CS terminal This offset is not the one written at electrical characteristics table, but the value determined under condition that the external output transistors are connected. Be careful of this value, because it varies according to the external transistor. The lager hFE of the output transistor makes the offset smaller, and smaller hFE makes it larger. For output current limitation, a capacitor for the phase compensation between the CNF terminal and the VCC terminal is needed. However, when an output current limit isn't needed, CS terminal is fixed on the low level (GND), and CL terminal is fixed on the high level (VCC), and the capacitor of the CNF terminal isn't necessary. CNF VCC A1 CNF VCC A1 A2 A2 CS CL Current limit CS CL (a) In the case that the current limit is applied. (b) In the case that the current limit isn't applied. 6/10 BA6901F Motor driver ICs *CR, TOUT terminal By connecting the external capacitor and resistor to the CR terminal, the saw tooth wave is produced by the chargedischarge of the capacitor which are corresponding to the cycle of the hall signal. The saw tooth wave of CR terminal varies with the external capacitor and resistor. The waveform of the CR terminal passes through the buffer amplifier and is outputted to TOUT terminal. The input voltage range of the CR terminal for the buffer amplifier of TOUT is 0.26VVCC. In case that the signal of the CR terminal is out of the range, outputted TOUT signal is not the same as the CR signal. And, the voltage range of the TOUT terminal waveform is different from the CR terminal. CR : VCRCP (0.35V ; Typ.) VCC TOUT : VTOUTL (1.0V ; Typ.) VCC - VTOUTH (1.0V ; Typ.) Hall input Hall input VCC-VTOUTH CR VCRCP CR VCRCP VCC-VTOUTH TOUT In case that the CR waveform dose not exceed the VCC-VTOUTH. TOUT In case that the CR waveform exceeds the VCC-VTOUTH. VTOUTL VTOUTL Timing chart for CR terminal, TOUT terminal *PWM terminal If the signal inputted to the PWM terminal is L (less than 0.8V), output (A1, A2) is forced to be turned off. For the normal operation of output (A1, A2), PWM signal is needed to be H (more than 2.0V). In case that PWM terminal is open, outputs are in the normal operation mode, because the PWM terminal is pulled up with resistor (30k : Typ. ) in the IC. The application circuit example that changes the rotation speed of fan motor dependent on ambient temperature by using charge-discharge pulse circuit, PWM input and the thermistor is shown below. + - Thermistor Current limit H 7/10 BA6901F Motor driver ICs !Application example CR 1 HO 2 REG AL LOGIC + - TOUT 16 VCC 15 A2 A2 14 A1 A1 13 CL PWM - + 3 ALB 4 PWM 5 LOCK DETECTION & AUTOMATIC RESTART 12 CS 11 H- 10 - LD 6 CNF 7 GND 8 - + - !Operation notes 1) Thermal shut down (TSD) This IC is built-in TSD. TSD has the temperature hysteresis. Output terminal voltage at ON side TSD ON (Typ. : 175C) All output transistor OFF. TSD OFF TSD ON TSD OFF Reset ordinary motion. (It has the temperature hysteresis of 20C 155 Junction temperature (C) 175 + + H+ 9 HALL 8/10 BA6901F Motor driver ICs 2) Power dissipation Power consumption (PC) of BA6901F is calculated to the following equation. Pc = Pc1 + Pc2 + Pc3 (1) Pc1 : Power consumption by circuit current Pc1 = VCC x ICC (2) Pc2 : Power consumption of output terminal Pc2 = (VCC - VOH ) x Io VOH is H voltage of output (A1 or A2). Io can be decreased by using the transistor of high hFE rank and it is effective to consumption electric power reduction. (3) Pc3 : Power consumption of HO, AL and ALB terminal Pc3 = VHO x IHO + VAL x IAL + VALB x IALB VHO is L voltage of Hall signal output (HO). VAL and VALB are L voltage of lock detection output (AL or ALB). IHO, IAL and IALB are current of HO, AL or ALB. Please care to the terminal design not to exceed the allowable power dissipation. 3) Hall signal input terminal (H+, H-) VCC VCC-2.8V C2 H- H+ VCC Hall input voltage range R1 1/2VCC RH Hall element R2 C1 GND Hall Amp input bias voltage Hall Amp input current = VCC R1 + R2 + RH RH : Impedance of Hall element Hall amp of BA6901F has input hysteresis (10mV : Typ.) Please adjust hall Amp input bias voltage by value of R1, R2 so that hall signal contains amplitude, input within range 0V (VCC-2.8V). In case VCC noise influence the hall signal by board wiring pattern, please connect capacitor C1 like above figure. In the case of long board wiring pattern from hall element to hall signal input terminal, please connect capacitor C2 like above figure. 4) GND Please keep up the voltage of GND less than the voltage of another terminal surely. 5) This product is produced with strict quality control, but destroyed in using beyond absolute maximum ratings. Once IC destroyed, a failure mode cannot be defined (like short-mode or open-mode). Therefore, physical security counter measure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is considered. 9/10 BA6901F Motor driver ICs !Electrical characteristic curves 1200 POWER DISSIPATION : Pd (mW) CIRCUIT CURRENT : ICC (mA) 12 10 8 6 4 2 0 SATURATION VOLTAGE : VOH (V) 12.0 11.8 1000 800 625 600 400 200 0 11.6 11.4 11.2 11.0 10.8 10.6 10.4 10.2 10.0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT : IO (mA) 0 25 50 75 100 125 150 0 5 10 15 20 25 30 AMBIENT TEMPERATURE : Ta (C) SUPPLY VOLTAGE : VCC (V) Power dissipation Supply current-Supply voltage characteristic Output "H" voltae-Output current characteristic !External dimensions (Units : mm) 10.00.2 16 9 6.20.3 4.40.2 1 8 1.50.1 0.150.1 0.1 0.11 1.27 0.40.1 SOP16 0.3Min. 10/10 |
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