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 = 25°C) Parameter Symbol Limits Power supply voltage VCC 36 Power dissipation Pd 625 Unit V ∗1 mW °C Operating temperature Topr −25~+75 Storage temperature Tstg −55~+150 °C Output current IOUT 70 ∗2 mA Signal output voltage VSO 36 V Signal output current ISO 15 mA Junction temperature Tjmax 150 °C ∗1 To use at temperature above 25°C reduce 5.0mW / °C. (On 70.0mm×70.0mm×1.6mm glass epoxy board.) ∗2 This value is not to be over Pd and ASO. !Recommended operating conditions (Ta = 25°C) Parameter Symbol Min. Typ. Max. Unit Operating supply voltage VCC 3.5 − 28.0 V 1/10 BA6901F Motor driver ICs !Block diagram CR 1 HO 2 + 16 TOUT 15 VCC A2 14 A2 A1 13 A1 12 CL 11 CS 10 H− 9 H+ − REG 3 LOCK DETECTION & ALB 4 PWM 5 LD 6 LOGIC AL AUTOMATIC RESTART PWM − + + − 7 − CNF + + − GND 8 !Pin descriptions Pin No. Pin name Function 1 CR Connection terminal of capacitor and resistor for charge-discharge pulse circuit 2 HO Hall signal output terminal 3 AL Alarm output terminal 4 ALB Alarm output terminal (Reverse signal output of AL) 5 PWM PWM input terminal (H,OPEN : output ON, L : output OFF) 6 LD Connection terminal of capacitor for Lock detection, Auto restart 7 CNF Connection terminal of capacitor for phase compensation 8 GND GROUND terminal 9 H+ Hall signal input terminal 10 H− Hall signal input terminal 11 CS Current sence input terminal 12 CL Current limit input terminal 13 A1 Output terminal 14 A2 Output terminal 15 VCC Power supply terminal 16 TOUT Charge-discharge pulse output terminal 2/10 BA6901F Motor driver ICs !Input / output truth circuit Hall input VCC H+ H− Current limit input PWM input VCC VCC VREG 1.42V (Typ.) 30kΩ (Typ.) 6.75kΩ (Typ.) PWM 20kΩ (Typ.) CS CL Output Charge-discharge pulse output VCC VCC A1,A2 TOUT Signal output HO,AL,ALB 3/10 BA6901F Motor driver ICs !Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 12V) Parameter Symbol Min. Typ. Max. Unit Conditions ICC 3.0 7.0 12.0 mA Hall input hysteresis Vhys ±4 ±10 ±20 mV VCOM=6.0V Charge current of capacitor for lock detection ILDC 2.0 5.0 8.0 µA VLD=1.5V Discharge current of capacitor for lock detection ILDD 0.2 0.5 0.8 µA VLD=1.5V Circuit current rCD 4 10 16 − Clamp voltage of capacitor for lock detection VLDCL 1.60 2.40 3.20 V Comparison voltage of capacitor for lock detection Charge-discharge current ratio of capacitor for lock detection At output : OFF rCD=ILDC / ILDD VLDCP 0.25 0.60 0.95 V Output H voltage VOH − 1.5 2.0 V IO=−10mA vs. VCC voltage Hall signal outputn L voltage VHO − 0.10 0.50 V IHO=5mA IAL=5mA, AL, ALB terminal VAL − 0.10 0.50 V VofsCS 75.0 92.0 99.5 mV TCS − 50 150 µsec PWM input voltage H VPWMH 2.0 − − V At output : ON PWM input voltage L VPWML − − 0.8 V At output : OFF Charge-discharge pulse comparison voltage VCRCP 0.26 0.35 0.44 V Charge-discharge pulse output voltage H VTOH 0.7 1.0 1.3 V ITO=−0.5mA vs. VCC voltage Charge-discharge pulse output voltage L VTOL 0.7 1.0 1.3 V ITO=0.5mA Alarm output L voltage CL-CS offset voltage Response time for current limit CL=100mV This product isn't designed for protection against radioactive rays. 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. = C × (VLDCL−VLDCP) ILDC Toff (Discharge time) = C × (VLDCL−VLDCP) ILDD Ton (Charge time) C VLDCL VLDCP ILDC ILDD : : : : : Value of capacitor at LD terminal (2.40V Typ.) Comparison voltage of capacitor (0.60V (5.0µA Charge current of capacitor Typ.) (0.5µA Typ.) Clamp voltage of capacitor Discharge current of capacitor Typ.) The following value shows charge time and discharge time at C=1.0µF for reference. Charge time=0.36sec. (Output : ON) Discharge time=3.60sec. (Output : OFF) Shows timing chart of LD terminal. H+ A1 Toff Ton Output Tr. OFF ON VLDCL LD VLDCP HIGH(Open collector) AL LOW ALB HO Depend on the hall output Motor lock Detect lock 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 CNF VCC A1 A1 A2 A2 CS CS CL Current limit (a) In the case that the current limit is applied. CL (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 0.26V∼VCC. 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 CR VCRCP VCRCP VCC-VTOUTH TOUT VTOUTL In case that the CR waveform dose not exceed the VCC-VTOUTH. TOUT VTOUTL In case that the CR waveform exceeds the VCC-VTOUTH. 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 (30kΩ : 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. + − Current limit Thermistor H 7/10 BA6901F Motor driver ICs !Application example CR TOUT + 1 16 − HO VCC 15 2 REG AL A2 LOCK DETECTION ALB & 4 LOGIC 3 AUTOMATIC RESTART A2 14 A1 13 A1 CL PWM PWM 5 12 − + LD + 6 CS 11 − CNF H− 7 10 − + + GND − 8 H+ HALL 9 Output terminal voltage at ON side !Operation notes 1) Thermal shut down (TSD) This IC is built-in TSD. TSD has the temperature hysteresis. TSD ON (Typ. : 175°C) All output transistor OFF. TSD OFF 155 TSD ON TSD OFF Reset ordinary motion. (It has the temperature hysteresis of 20°C <Typ.> ) 175 Junction temperature (°C) 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 × ICC (2) Pc2 : Power consumption of output terminal Pc2 = (VCC – VOH ) × 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 × IHO + VAL × IAL + VALB × 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 H− H+ VCC VCC-2.8V Hall input voltage range C2 R1 1/2VCC RH C1 Hall element R2 GND Hall Amp input bias voltage Hall Amp input current = VCC R1 + R2 + RH Hall amp of BA6901F has input hysteresis (±10mV : Typ.) RH : Impedance of Hall element 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 1200 12 1000 10 12.0 800 625 600 400 200 0 0 25 50 75 100 125 8 6 4 2 0 150 SATURATION VOLTAGE : VOH (V) 11.8 CIRCUIT CURRENT : ICC (mA) POWER DISSIPATION : Pd (mW) !Electrical characteristic curves 0 5 10 15 20 25 SUPPLY VOLTAGE : VCC (V) AMBIENT TEMPERATURE : Ta (°C) Supply current−Supply voltage characteristic Power dissipation 30 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) Output "H" voltae−Output current characteristic !External dimensions (Units : mm) 1 8 0.3Min. 9 4.4±0.2 0.11 1.5±0.1 6.2±0.3 10.0±0.2 16 1.27 0.15±0.1 0.1 0.4±0.1 SOP16 10/10