M Test Procedure for the LB1938FAGEVB Evaluation Board VCC (Power Supply) VIN (Power Supply) C1: VCC Bypass capacitor （Electrolytic capacitor） ：10uF Logic input (Circuit diagram of the evaluation board) 1/8/2014 1 www.onsemi.com OUT2 OUT1 (NC) 5 OUT2 6 OUT1 7 P-GND 8 P-GND 10uF C1 + 4 S-GND 3 IN2 1 VCC 2 IN1 LB1938FA IC1 VCC SW1 SW2 S-GND IN2 IN1 VIN Evaluation Board Manual [Supply Voltage] VCC (2.2 to 10V): Power Supply for LSI [Toggle Switch State] Upper Side: High (VIN) Middle: Open, enable to external logic input Lower Side: Low (GND) [Operation Guide] For DC motor control 1. Initial Condition Setting: Set the toggle switches “Open or Low” 2. Motor Connection: Connect the Motor between OUT1 and OUT2. 3. Power Supply: Supply DC voltage to VCC, VIN. 4. Motor Operation: Set IN1 and IN2 terminals according to the purpose (See LB1938FA datasheet). - Truth value table IN1 L H L H 1/8/2014 IN2 L L H H OUT1 OUT2 OFF OFF H L L H H H 2 Mode Standby Forward Reverse Brake www.onsemi.com DCmotor load VCC = 3V IN2 = ”H” Current waveform example - “brake current” High Low High High High Ch2 VOUT1 2V/div High Ch3 VOUT2 2V/div Low High High Brake Ch1 IN1 5V/div Brake Ch4 Icoil 200mA/div Reverse T=20ms/d 1/8/2014 3 www.onsemi.com