Test Procedure for the LV8760TGEVB Evaluation Board For DC Motor Control CURRENT PROBE AMPLIFIER Osclloscope PROBE INPUT OUTPUT CHANNEL 1 2 3 4 Power supply 1 A V DC Motor - + Power supply 2 Power supply 3 A V V A - + + Function generator Multimeter VOUT Hz CHANNEL 1 - + 2 Table1: Required Equipment Equipment Power supply1 Power supply2 Power supply3 Function generator Multimeter Oscilloscope Current probe LV8760T Evaluation Board DC Motor 1/8/2014 1 Efficiency 10V-1A 5V-0.5A 40V-5A 200kHz 4 channel 40V-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): Motor Power Supply VREF (0 to VCC-1.8V): Current Limit Control Reference Voltage VCC (3 to 5.5V): Control Power Supply Toggle Switch State • • • Upper Side: High (VCC) Middle: Open, enable to external logic input Lower Side: Low (GND) Operations Guide 1. 2. 3. 4. Initial Condition Setting: Set “Open or Low” all switches. Motor Connection: Connect the Motor between OUTA and OUTB. Power Supply: Supply DC voltage to VM, VCC and VREF. Ready for Operation from Standby State: Turn “High” the PS pin toggle switch. 5. Motor Operation: Set IN1, and IN2 pin according to the purpose. (See LV8760T‘s logic table). Setting for External Component Value 1. Current limit value At VREF = 1.5V (I)limit = VREF [V]/5/R1 [ohm] = 1.5 [V] / 5 / 0.22 [ohm] = 1.36 [A] 2. Current limit regeneration time and short-circuit detection time Tscp ≈ C5 [pF]× Vthscp[V]/Iscp[µA] = 100[pF] × 1[V]/5[µA] = 20[µs] 3. Check VREG5 and VG pin voltage at multimeter. 4. Check the IN1 or IN2 pin voltage at scope CH1, OUTA pin voltage at scope CH2, OUTB pin voltage at scope CH3, and the output current waveform at scope CH4. Table2: Desired Results INPUT OUTPUT VM=24V VREF=1.5V REG5=4.5V to 5.5V VCC=5V VG=28V to 29.8V PS=High 1/8/2014 2 www.onsemi.com Figure.1 Forward↔Output off IN2=Low Figure 2. Forward↔Brake IN1=High 200ms/div 1/8/2014 200ms/div IN1 5V/div IN2 5V/div OUTA 10V/div OUTA 10V/div OUTB 10V/div OUTB 10V/div Motor current 0.5A/div Motor current 0.5A/div 3 www.onsemi.com