Test Procedure for the LB11685AV Evaluation Board Osclloscope CURRENT PROBE AMPLIFIER1 PROBE INPUT OUTPUT FAN Motor Multimeter Power supply 100k ohms resistor Table: Required Equipment Equipment Power supply Multimeter Oscilloscope Current probe LB11685AV Evaluation Board Resistor Motor 1/8/2014 Efficiency 18V-3A 5V 4 channel 100k ohms 12V-3W 1 www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Initial check Boot up at the VCC = 4.5V. Confirm that the motor rotates smoothly and in a right direction. 3. Booting check (StartUp-mode) Check whether a booting of a motor is stable. (Booting) Boot up at the VCC = 4.5V and 18V. Then, at each VCC, check whether a motor boots 100 times in 100times. Check lowest VCC which a motor can start. (StartUp voltage) Boot up at the VCC by 0.1V step from 2.5V to 4.5V. When the VCC is changed, turn it off once. The lowest voltage which a motor can boot is the StartUp voltage. Check whether this StartUp voltage is less than 4.0V. Check the some waveforms. (Booting waveforms) Boot up at the VCC =12V. Check the V, FG and VCO voltage waveform at scope CH1, CH2 and CH3, and the output current waveform of V at scope CH4 by the Oscilloscope. ex) These waveforms are different by each motor. StartUp-mode T=0.5s/div V 5V/div VCO 0.5V/div FG 10V/div Current of V 0.5A/div Turn on the power supply 4. Normal rotation check (Regular-Rotation-mode) Check the some waveforms. (Rotation waveforms) Supply the VCC=12V. Check the V, FG and VCO voltage waveform at scope CH1, CH2 and CH3, and the output current waveform of V at scope CH4 by the Oscilloscope. ex) These waveforms are different by each motor. Regular-Rotation-mode T=2ms/div V 5V/div VCO 0.5V/div FG 10V/div Current of V 200mA/div 1/8/2014 2 www.onsemi.com Check the VCO voltage. (VCO voltage) Supply the VCC=4.5V and 18V. At each VCC, check the VCO voltage by a multimeter whether the voltage is within 2.10V and 2.7V at Normal Rotation (Regular-Rotation-mode). Check the output current. (Io) Supply the VCC=4.5V and 18V. At each VCC, check the current of the power supply. 5. Lock detection check (Motor-Lock-mode) Check the Lock detection behavior. (Lock) Supply the VCC=4.5V, 12V and 18V. At each VCC, stop the Motor by your hand forcibly. Then, check the V, FG and VCO voltage waveform at scope CH1, CH2 and CH3, and the output current waveform of V at scope CH4 by the Oscilloscope. ex) These waveforms are different by each motor. Motor-Lock-mode T=0.5s/div V 5V/div VCO 0.5V/div FG 10V/div Current of V 0.5A/div The Motor is stopped 6. Checking result The Checking table is shown below. VCC Booting 4.5V 100/100 OK 12V 18V 100/100 OK StartUp voltage < 4.0V : OK Booting waveforms OK - Rotation waveforms OK - VCO voltage 2.10 to 2.70V OK 2.10 to 2.70V OK Io value value Lock OK OK OK Rotation waveforms OK - VCO voltage 2.16V 2.58V Io 0.03A 0.20A Lock OK OK OK A sample of checking result is shown below. VCC Booting 4.5V 100/100 12V 18V 100/100 StartUp voltage = 3.2V 1/8/2014 Booting waveforms OK - 3 www.onsemi.com