Test Procedure for the LB1909MCGEVB Evaluation Board For stepper motor control CURRENT PROBE AMPLIFIER1 Osclloscope PROBE INPUT OUTPUT CHANNEL 1 2 3 4 Stepping Motor Power supply 1 A V - + Logic generator Power supply 2 A V CHANNEL 1 - 2 3 4 + Table1: Required Equipment Equipment Efficiency 25V-3A 10V-0.5A 200kHz 4 channel 25V-2A Power supply1 Power supply2 Logic generator Oscilloscope Current probe1 LB1909MC Evaluation Board Stepper Motor 1/8/2014 1 www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following guide. [Supply Voltage] VCC (2.5 to 16V) : Power Supply for LSI VIN (1.8 to 10V) : Logic “High” voltage for toggle switch [Toggle Switch State] Upper Side: High (VIN) Middle: Open, enable to external logic input Lower Side: Low (GND) [Operation Guide] 1. Initial Condition Setting: Set “Open” the toggle switches ENA , IN1 and IN2. 2. Power Supply: Supply DC voltage to VCC and VIN. 3. Ready for Operation from Standby State: Turn “High” the ENA terminal toggle switch. 4. Motor Operation: Input the signal which is in condition to want to operate into IN1 and IN2. 3. Check the IN1 , IN2 and OUT1 terminal voltage at scope CH1 , CH2 and CH3, and the output current waveform at scope CH4. Table2: Desired Results INPUT OUTPUT VCC=12V VIN=5V * Refer to the following waveform ENA=H IN1 , IN2=Full-step signal Typical current waveform LB1909MC Full-Step(VCC=12V, 200pps) High IN1 Low Low High IN2 High Low (%) 100 I1 Ch2 IN2 10V/div Ch3 VOUT1 10V/div 0 Ch4 IOUT1 200mA/div -100 100 I2 Ch1 IN1 10V/div 0 T=5ms/div -100 1/8/2014 2 www.onsemi.com