Test Procedure for the LV8731VGEVB 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 LV8731V 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 32V): 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 STEP/D22, and “Open or Low” the other switches. 2. Power Supply: Supply DC voltage to VM, VREF and VDD. 3. Ready for Operation from Standby State: Turn “High” the ST terminal toggle switch. Channel 1 and 2 are into 2-phase excitement initial position (100%, -100%) . 4. Motor Operation: Input the clock signal into the terminal STEP/DC22. 5. 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: Output Enable. Setting for External Component Value 1. Constant Current (100%) At VREF = 1.0V Iout = VREF [V]/5/RNF [ohm] =1.0 [V] / 5 / 0.47 [ohm] =0.426 [A] 2. Chopping Frequency Fchop =Ichop [uA]/(Cchop x Vt x 2) =10 [uA] / (180 [pF] x 0.5 [V] x 2) =55 [kHz] 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 1/8/2014 2 www.onsemi.com output current waveform at scope CH3 and CH4. Table2: Desired Results INPUT OUTPUT VM=24V VREF=1.5V VDD=5V ST=High DM=Low VREG5=4.5V to 5.5V EMM=Low, RST/BLK=Low, OE=Low VG=28V to 29.8V ATT1=ATT2=Low FR/DC21=Low MD1/DC11=MD2/DC12=High STEP/DC22=500Hz(Duty50%) 20ms/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 LV8731V 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 32V): 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. Power Supply: Supply DC voltage to VM, VREF and VDD. 3. Ready for Operation from Standby State: Turn “High” the ST terminal toggle switch. Channel 1 and 2 are into 2-phase excitement initial position (100%, -100%) . 4. Motor Operation: Set MD1/DC11, MD2/DC12, FR/DC21, and STEP/DC22 terminals according to the purpose. 5. 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. 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. 1/8/2014 5 www.onsemi.com Table4: Desired Results INPUT OUTPUT VM=24V VREF=1.5V VDD=5V ST=High DM=High VREG5=4.5V to EMM=Low, RST/BLK=Low, 5.5V OE=Low VG=28V to 29.8V ATT1=ATT2=Low FR/DC21=STEP/DC22=Low MD1/DC11=High MD2/DC12=100kHz(Duty50%) 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