Test Procedure for the LB1848MGEVB Evaluation Board M C1:VCC Bypass capacitor （Electrolytic capacitor） 10μF “VCC” Power Supply “VIN” Power Supply Function generator OUT2 OUT3 OUT3 9 OUT1 OUT4 OUT4 10 (Circuit diagram of the evaluation board) OUT2 7 GND 6 5 IN1 2 IN2 SW1 SW2 4 SOF C1 + 1 VCC LB1848M IC1 3 ENA 10uF VCC OUT1 8 GND SW3 1/8/2014 1 IN1 SOF ENA IN2 VIN www.onsemi.com (Supply Voltage) VCC (2.5 to 7.5V): Motor power supply voltage for IC VIN(2.5 to 7.5V): Control power supply voltage for IC (Toggle Switch State) Upper Side: High (VIN) Middle: Open, enable to external logic input Lower Side: Low (GND) (Testing method) ・Connect a stepper motor with OUT1, OUT2, OUT3 and OUT4. ・Connect the motor power supply with the terminal VCC, the control power supply with the terminal VIN. Connect the GND line with the terminal GND. ・Stepper motor drives it in 2phase excitation by inputting a signal such as follows into ENA,IN1 and IN2. ・Check the stepper motor is rotating. ・Check the waveform of the output voltage and current.(Please refer to the following waveform example.) Input signal ENA L H H H H H H H H H L IN1 L L H H L L H H L L L IN2 L L L H H L L H H L L OUT1 OFF H L L H H L L H H OFF OUT2 OFF L H H L L H H L L OFF OUT3 OFF H H L L H H L L H OFF OUT4 OFF L L H H L L H H L OFF Output voltage IOUT1 Output current IOUT2 1/8/2014 2 www.onsemi.com •Stepper motor driving waveform example Ch1 IN1 10V/div Ch2 VOUT1 5V/div Ch3 VOUT2 5V/div Ch4 IOUT1 100mA/div T=1ms/div VCC=ENA=5V, SOF=open 2phase excitation, 1000pps 1/8/2014 3 www.onsemi.com