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| ICs for Motor AN6612, AN6612S Motor Control Circuits s Overview The AN6612 and the AN6612S are the electronic governor circuits suitable for the rotating speed control of a low voltage and compact DC motor which is used for a small tape recorder, etc. AN6612 Unit : mm 1 9.40.3 2 3 4 6.30.3 8 7 s Features * Wide range of operating voltage : VCC (opr) =1.8V ~ 8V * 2 package types * Fewer external parts * Speed control in steps with linear fine control * Output current limiting circuit is built-in 5 0.51min. 3.80.25 (3.45) 3 ~ 15 7.620.25 0.15 - + 0.1 0.05 8-Lead DIP Package (DIP008-P-0300B) AN6612S 0.40.25 Unit : mm 0.60.3 1 2 3 4 8 7 6 5 5.00.3 0.15 0.65 1.50.2 0.10.1 1.27 0.3 4.20.3 6.50.3 8-Lead SOP Package (SOP008-P-0225A) s Block Diagram VM 8 10k R9 1k R10 VO 7 VB 6 GND 5 + Comparator - Start Circuit Ref.Voltage 1 VRM 2 VRP 3 VI 4 VCC 2.54 6 0.50.1 1.20.25 AN6612, AN6612S s Pin Descriptions Pin No. 1 2 3 4 Pin Name Current Sensor Reference Voltage Control VCC Pin No. 5 6 7 8 GND Base Output Base Motor pin Pin Name ICs for Motor s Absolute Maximum Ratings (Ta= 25C) Parameter Supply Voltage Supply Current Power Dissipation AN6612 AN6612S AN6612 AN6612S Symbol VCC I4 PD Topr Tstg Rating 10 5 400 200 -20 ~ + 75 -40 ~ +150 -40 ~ +125 Unit V mA mW C C Operating Ambient Temperature Storage Temperature s Electrical Characteristics (Ta = 25C) Parameter Supply Current Reference Voltage Starting Current Voltage Variable Characteristics for Rotating Speed Time Drift Characteristics for Rotating Speed Temperature Variation Characteristics for Rotating Speed Output Current Limit Voltage * In case that only IC temperature is changed. Symbol I4 V2- 1 Ia |NV| |NT| NA * Vt (1 - 5) VCC = 3V VCC = 3V, R2-1 = 10k VCC = 1.8V, Ra = 4.9 VCC = 1.8V ~ 4V, IL = 72mA (1.7g * cm) VCC = 3V, IL = 72mA, t = 15s ~ 10min. VCC = 3V, IL = 72mA, Ta = -20C ~ + 60C VCC = 3V 1.24 250 10 0.1 - 0.035 0.6 0.7 0.8 Condition min. typ. 1.9 1.32 max. 3 1.40 Unit mA V mA rpm/V % %/C V s Application Circuit 0.5 M 10 Motor 910 1k VR500B VR3kB 10k 1 2 3 5 2SA881A AN6612 AN6612S 6 7 8 + - - + 0.47F 4 2.2F -VCC +VCC Motor Constants Ra : Internal resistor = 4.9 Ka : Electromotive force constant = 0.4mV/rpm KT : Torque constant = 29g * cm/A |
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