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| UTC UA9406 LINEAR INTEGRATED CIRCUIT 2-PHASE HALF-WAVE MOTOR PREDRIVER DESCRIPTION The UTC UA9406 is a 2-phase, half-wave motor predriver suited for fan motors. FEATURES *Lock detection and rotational speed sensing mechanisms are built in. *Compact 8-pin SOP package reduces the number of external components required. *Automatic restart when the motor lock is undone. *Hall inputs have a hysteresis. SOP-8 BLOCK DIAGRAM Vcc 8 7 6 5 Autornatic reset LOGIC Hall amp REGULATOR Rock Det 1 2 3 4 Hall UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R109-014,A UTC UA9406 PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL RATINGS 30 550* -30 ~ +75 -55 ~ +125 70 ABSOLUTE MAXIMUM RATINGS UNIT V mW mA Applied voltage Vcc Power dissipation Pd Operating Temperature Topr Storage Temperature Tstg Output current Io Max. * Reduced by 5.5mW for each increase in Ta of 1 over 25 When mounted on a glass epoxy board (50x50x1.6mm) OPERATING POWER SUPPLY VOLTAG (Ta=25) PARAMETER Applied voltage SYMBOL Vcc TEST CONDITIONS Operate within the allowable power Dissipation for -30 4 1.0 TYP MAX 28 Vcc-0.5 UNIT V V Input voltage* VBH *Input voltage range includes the amplitude of signal ELECTRICAL CHARACTERISTICS (Unless otherwise noted, Ta=25, Vcc=12V) PARAMETER Supply current Hall amplifier input hyseresis (+) Hall amplifier input hysteresis (-) Pin6 charge current Pin6 discharge current Pin6 charge/discharge ratio Pin6 clamp voltage Pin6 comparator voltage Pin7 Output high level voltage Pin8 Output high level voltage Pin3 Output low level voltage Pin3 current capacity SYMBOL Icc Vhys + TEST CONDITIONS When output is OFF Pin2 voltage with respect to pin4 voltage, VB=6V Pin2 voltage with respect to pin4 voltage, VB=6V V6pin=1.5V V6pin=1.5V I6c/I6d MIN 3 -3 2.0 0.35 3 2.2 0.4 10 10 8.0 TYP 3.2 MAX 5.0 15 -15 UNIT mA mV mV A A V V V V V mA VhysI6c I6d rcd V6CL V6cp V7H V8H V3L I3 Io=10mA Io=10mA I3L=5.0mA V3L=2.0V 3.45 0.80 4.5 2.6 0.6 10.5 10.5 5.25 1.45 8 3.0 0.8 0.5 UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R109-014,A UTC UA9406 LOCK DETECTION LINEAR INTEGRATED CIRCUIT The automatic restart circuit detects a motor lock condition and automatically turns off the output current. When the lock condition is cleared, the IC automatically restarts and allow the motor to run. In the UTC UA9406, automatic restart is performed in the following manner. A motor lock condition is detected when the Hall signal stops switching. The output is ON when pin 6 is being charged, and OFF when pin 6 is being discharged. Pin 3 is ON during normal operation, and OFF when the motor is locked. Pin 3 is an open collector output. Hall input ON OFF Pin6 clamp voltage Motor output 6 pin Pin6 comparator voltage Motor locked Motor lock detected tON * High tOFF ** Reverts to normal operation Motor lock cleared 3pin L Fig.1 Output ON time (tON) and OFF time (tOFF) determined by the pin6 capacitor where tON= C (V6CL-V6CP) (sec) I6C C (V6CL-V6CP) (sec) tOFF= I6d C is the capacitance of the pin-6 external capacitor V6CL is the pin6 clamp voltage V6CP is the pin6 comparator voltage I6C is the pin6 charge current I6d is the pin6 discharge current OPERATION NOTES (1) The lock detection output pin (pin 3) may maintain HIGH level for a few hundred milliseconds when the power is turned on. Power 3 pin A few hundred millseconds Fig.2 UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R109-014,A UTC UA9406 LINEAR INTEGRATED CIRCUIT (2) Allowable power dissipation The allowable power dissipation is plotted against ambient temperature in Fig. 3. (3) Power dissipation Power consumed in the IC can be calculated from the following equation: PC = PC1+PC2+PC3 (1) PC1 is power consumed by the circuit current. PC1 = VCCxICC (2) PC2 is the output current consumption. PC2 = (VCCxVOH)xIO VOH is the HIGH level voltage of pins 7 and 8. Power dissipation can be reduced by raising the hfe-rank of the external output transistor and thereby reducing the IO value. (3) PC3 is power consumed by pin 3. PC3 = V3LxI3 Where V3L is the pin-3 LOW level voltage and I3 is the pin-3 current. Make sure that your application does not exceed the allowable power dissipation of the IC. POWER DISSIPATION, Pd (W) 1.0 0.8 0.6 0.4 0.2 UA9406 50 75 100 125 25 AMBIENT TEMPERATURE, Ta () Fig.3 150 UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R109-014,A UTC UA9406 LINEAR INTEGRATED CIRCUIT Output voltage vs.output current for pins 7 and 8 Vcc=12V ELECTRICAL CHARACTERISTIC CURVES Current capacity vs.supply voltage for pin 3 Vcc=12V 20 12 15 7,8 pin OUTPUT VOLTAGE (V) 12 I3L (mA) 10 11 5 0 2 4 6 8 10 10 0 20 40 60 80 3 pin SUPPLY VOLTAGE (V) 7,8 pin OUTPUT CURRENT (mA) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R109-014,A |
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