Test Procedure for the LV8727GEVB Evaluation Board Osclloscope Function generator CHANNEL Hz 1 2 (1) 3 4 (2) (3) CHANNEL (4) 1 2 Power supply 2 CURRENT PROBE AMPLIFIER 1 A CURRENT PROBE AMPLIFIER 2 PROBE INPUT PROBE INPUT OUTPUT OUTPUT V - + Power supply 3 A V Power supply 1 A V - - + + Stepping Motor Table 1: Required Equipment Equipment Power supply1 Power supply2 Power supply3 Function generator Oscilloscope Current probe1 Current probe2 LV8727 Evaluation Board Stepper Motor 1/8/2014 Efficiency 100V-10A 5V-0.5A 10V-1A 200kHz 4 channel 35V-3A 1 www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following guide. [Supply Voltage] VM (9 to 45V): 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) [Operation Guide] 1. Initial Condition Setting: Set “Open” the toggle switch STEP, 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 , OE and RST terminal toggle switch. Channel 1 and 2 are into Full step excitement initial position (100%, 100%) . 4. Motor Operation: Input the clock signal into the terminal STEP. 5. Other Setting i. FR: Motor rotation direction (CW / CCW) setting. ii. MD1 , MD2 , MD3 : Excitation mode. 3. Check the STEP and MO terminal voltage at scope CH1 and CH2, and the output current waveform at scope CH3 and CH4. Table 2: Desired Results INPUT VM=24V VREF=1.5V VDD=5V ST=High OE=High RST=High FR=Low 1/8/2014 OUTPUT * Refer to the following waveform 2 www.onsemi.com Waveform of LV8727GEVB evaluation board. ●Figure 1. Half Step VM=24V , VREF=0.45V , VDD=5V ST=H , OE=H , RST=H FR=L MD1=L , MD2=L , MD3=L STEP=0.3kHz (Duty 50%) 5ms/div ●Figure 2. Half Step VM=24V , VREF=0.45V , VDD=5V ST=H , OE=H , RST=H FR=L MD1=L , MD2=H , MD3=L STEP=2.4kHz (Duty 50%) 5ms/div (1) (1) STEP 5V/div STEP 5V/div (2) (2) MO 5V/div (3) (4) MO 5V/div (3) Iout1 1A/div Iout2 1A/div ●Figure 3. 1/128 VM=24V , VREF=0.45V , VDD=5V ST=H , OE=L , RST=H FR=L MD1=L , MD2=L , MD3=H STEP=19.2kHz (Duty 50%) Iout1 1A/div Iout2 1A/div (4) ●Figure 4. 1/20 Step VM=24V , VREF=0.45V , VDD=5V ST=H , OE=H , RST=H FR=L MD1=H , MD2=H , MD3=H STEP=3.0kHz (Duty 50%) 5ms/div 5ms/div (1) (1) STEP 5V/div STEP 5V/div (2) (2) MO 5V/div MO 5V/div (3) (4) 1/8/2014 (3) Iout1 1A/div Iout1 1A/div Iout2 1A/div 3 Iout2 1A/div (4) www.onsemi.com Table 3: Excitation setting method Input MD3 MD2 MD1 1ch current 2ch current Low Low Low Half Step 1-2 phase 100% 0% Low Low High 1/8 Step 2W1-2 phase 100% 0% Low High Low 1/16 Step 4W1-2 phase 100% 0% Low High High 1/32 Step 8W1-2 phase 100% 0% High Low Low 1/64 Step 16W1-2 phase 100% 0% High Low High 1/128 Step 32W1-2 phase 100% 0% High High Low 1/10 Step - 100% 0% High High High 1/20 Step - 100% 0% 1/8/2014 4 Excitation mode Initial position Micro step resolution www.onsemi.com