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| MITSUMI Electronic Governer for DC Motors LAG674 Electronic Governer for DC Motors Monolithic IC LAG674 Outline This is an IC for DC motor electronic governors, developed with emphasis on low-voltage operation; it has control functions operating at voltages as low as 0.9 V (with performance guaranteed to 1.0 V). Features 1. Stabilized internal reference voltage generation circuit with a flat temperature characteristic (100 ppm) and excellent reduced-voltage characteristics (operation stable down to 0.9 V) 2. Low startup voltage of 0.75 V max. 3. Internal power transistor ensures large startup currents (500 mA-min at 1.0 V using the standard circuit) 4. On/off switching pin provided; on/off control possible at low startup voltages, power supply current while off is 5A or less Package SOP-8A (LAG674F) Absolute Maximum Ratings Item Operating temperature Storage temperature Power supply current Power consumption I Power consumption II Operating voltage Output current Symbol TOPR TSTG VCC Pd1 Pd2 Vop IL 1.0 Ratings -20~+60 -40~+125 7 600 900 5 Units C C V mW mW V A *1 *2 *1: *2: When mounted on a 20 30 0.5 mm printed circuit board (glass-reinforced epoxy). When Pd exceeds the rated value, the value of Pd takes precedence. MITSUMI Electronic Governer for DC Motors LAG674 Electrical Characteristics Item Recommended operating voltage range Leakage current while off I Leakage current while off II Power supply current while on I Power supply current while on II Reference voltage Reference voltage fluctuation Output voltage Reference voltage fluctuation Pin 7 threshold Motor ON/OFF SW Pin 7 input current I Pin 7 input current II Starting power supply voltage Startup current Output saturation voltage (Except where noted otherwise, Ta=25C) Measurement circuit Symbol Vccopr Ileak1 Ileak2 ICC1 ICC2 Vref Vref VM VM VTH I IN1 I IN2 Vccs IMS Vosat K Measurement conditions Min. Typ. Max. Units 1.0 5.0 20 5 1.2 1.0 115 -0.5 -5 0.3 0.8 35 0.43 1.6 50 127 1.8 1.5 140 V A A mA mA mV V mV/V V A A V mA 0.2 6.7 7.0 7.3 V 1 1 2 2 2 2 3 3 1 1 1 3 3 4 5 VCC=5V, SW OFF VCC=1.2V, SW OFF VCC=5V, SW ON VCC=1.2V, SW ON VCC=1.2V VCC=1.0~5.0V VCC=1.2, RM=6 VCC=1.0~5.0V, RM=6 Voltage at which Icc reaches 90mA RM=6, IM=ICC-1mA VIN (7PIN) =0.5V VIN (7PIN) =3V Voltage at which IM reaches 30mA RM=1.2, IM=VM/1.2 VCC=1.0V, RM=1.2 VCC=1.0V, IM=200mA VCC=1.0~5.0V IM=25~200mA K= VM/ VA 500 0.5 mV/V 5 0.5 3.4 70 0.75 0.56 0.61 0.66 Bridge ratio *1 50 80 120 m VCC=1.0~5.0V Output resistance Ro Vref / Ta VM / Ta K / Ta VMT 5 IM=25~225mA Ro= Reference voltage temperature characteristic Output voltage temperature characteristic Bridge ratio temperature characteristic Output voltage aging drift characteristic 2 3 VM/ IA *2 3 100 150 ppm/T ppm/T VCC=1.2V Ta=-20~60C Ta=-20~60C * VCC=1.2V, RM=6 *3 *3 VCC=1.0~5.0V 5 IM=25~200mA Ta=-20~60C 3 VCC=1.2, RM=6 T=15S~10M 100 ppm/T 0.1 % Measurement conditions: Except where noted otherwise, in measurement circuits VCC=1.2V 1: At a certain point within the range VCC=1.0 to 5.0 V, IM=25 to 200 mA, the value of VA is varied and the value VM/ VA is determined. 2: At a certain point within the range VCC=1.0 to 5.0 V, the value of IM is varied between 25 mA and 225 mA, and the value VM/ IA is determined. 3: The temperature characteristics of the reference voltage, output voltage and bridge ratio, as well as the drift characteristic, are all reference values and are not guaranteed. * * * MITSUMI Electronic Governer for DC Motors LAG674 Block Diagram Measuring Circuit Measurement circuit 1 Measurement circuit 2 Measurement circuit 3 Measurement circuit 4 Measurement circuit 5 |
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