Test Procedure for the LV8740VGEVB Evaluation Board For Stepper Motor Control CURRENT PROBE AMPLIFIER 1 Osclloscope CURRENT PROBE AMPLIFIER 2 PROBE INPUT PROBE INPUT OUTPUT OUTPUT CHANNEL 1 2 3 4 Stepping Motor Power supply 1 A V Multimeter - + VOUT - + Power supply 2 A V Power supply 3 A V - - + + Function generator Hz CHANNEL 1 2 Table1: Required Equipment Equipment Power supply1 Power supply2 Power supply3 Function generator Multimeter Oscilloscope Current probe1 Current probe2 LV8740V Evaluation Board Stepper Motor 1/8/2014 1 Efficiency 35V-5A 5V-0.5A 10V-1A 200kHz 4 channel 35V-3A www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following specifications. Supply Voltage • • • VM (9 to 35V): Power Supply for LSI VREF (0 to 3V): Const. Current Control for Reference Voltage VDD (2 to 5V): Logic “High” voltage for toggle switch Toggle Switch State • • • Upper Side: High (VDD) Middle: Open, enable to external logic input Lower Side: Low (GND) Operations Guide 1. Initial Condition Setting: Set “Open” the toggle switch STP/D22, and “Open or Low” the other switches. 2. Motor Connection: Connect the Motors between OUT1A and OUT1B, between OUT2A and OUT2B. 3. Power Supply: Supply DC voltage to VM, VREF and VDD. 4. Ready for Operation from Standby State: Turn “High” the ST terminal toggle switch. Channel 1 and 2 are into full-step initial position (100%, -100%). 5. Motor Operation: Input the clock signal into the terminal STEP/DC22. 6. Other Setting: (See Application Note for detail) i. ATT1, ATT2: Motor current attenuation. ii. EMM: Short circuit protection mode change. iii. RST/BLK: Initial Mode. iv. FR/DC21: Motor rotation direction (CW/CCW) setting. v. MD1/DC11, MD2/DC12: Excitation mode. vi. OE/CMK: Output Enable. 3. Check VREG5 and VG terminal voltage at multimeter. 4. Check the STEP/DC22 and MONI terminal voltage at scope CH1 and CH2, and the output current waveform at scope CH3 and CH4. Table2: Desired Results INPUT OUTPUT VM=24V,VDD=3.3V,VREF=1.5V VREG5=4.5V to ST=H,DM=L 5.5V EMM=L,RST=L,OE=L VG=28V to 29.8V ATT1=ATT2=L, FR/DC21=L MD1/DC11=MD2/DC12=H STP/DC22=500Hz(Duty50%) 1/8/2014 2 www.onsemi.com 5ms/div CH1 STEP 5V/div CH2 MONI 5V/div Iout1 1A/div CH3 Iout2 1A/div CH4 1/8/2014 3 www.onsemi.com For DC Motor Control CURRENT PROBE AMPLIFIER Osclloscope PROBE INPUT OUTPUT CHANNEL 1 2 3 4 DC Motor Power supply 1 A V Multimeter - + VOUT - + Power supply 2 A V Power supply 3 A V - - + + Function generator Hz CHANNEL 1 2 Table3: Required Equipment Equipment Power supply1 Power supply2 Power supply3 Function generator Multimeter Oscilloscope Current probe LV8740V Evaluation Board DC Motor 1/8/2014 4 Efficiency 35V-5A 5V-0.5A 10V-1A 200kHz 4 channel 35V-3A www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following specifications. Supply Voltage • • • VM (9 to 35V): Power Supply for LSI VREF (0 to 3V): Const. Current Control for Reference Voltage VDD (2 to 5V): Logic “High” voltage for toggle switch Toggle Switch State • • • Upper Side: High (VDD) Middle: Open, enable to external logic input Lower Side: Low (GND) Operations Guide 1. Initial Condition Setting: Set “Open” the toggle switch DM, and “Open or Low” the other switches. 2. Motor Connection: Connect the Motor(s) between OUT1A and OUT1B, between OUT2A and OUT2B. 3. Power Supply: Supply DC voltage to VM, VREF and VDD. 4. Ready for Operation from Standby State: Turn “High” the ST and DM terminal toggle switch. 5. Motor Operation: Set MD1/DC11, MD2/DC12, FR/DC21, and STEP/DC22 terminals according to the purpose. 6. Other Setting: (See Application Note for detail) i. ATT1, ATT2: Motor current attenuation. ii. EMM: Short circuit protection mode change. iii. RST/BLK: Not performed. iv. OE: Output enable. 3. Check VREG5 and VG terminal voltage at multimeter. 4. Check the MD2/DC12, OUT1A, and OUT1B terminal voltage at scope CH1, CH2, and CH3, and the output current waveform at scope CH4. 5. Switch to channel 2(STEP/DC22, OUT2A, OUT2B) as well as channel 1(MD2/DC12, OUT1A, OUT1B) and measure it. Table4: Desired Results INPUT OUTPUT VM=24V,VDD=3.3V,VREF=1.5V VREG5=4.5V to ST=H,DM=H 5.5V VG=28V to 29.8V EMM=L,RST=L,OE=L ATT1=ATT2=L, FR/DC21=STP/DC22=L MD1/DC11=H MD2/DC12=100kHz(Duty50%) 1/8/2014 5 www.onsemi.com 2μs/div 1/8/2014 CH1 DC12 5V/div CH2 OUT1A 10V/div CH3 OUT1B 10V/div CH4 Iout1 1A/div 6 www.onsemi.com