Test Procedure for the LB1843VGEVB Evaluation Board 09/08/2012 R1: Output current detective resistor ：1ohm M C2: Output noise reject capacitor ：0.01uF VCC (Power Supply) VIN (Power Supply) C1: VCC Bypass capacitor （Electrolytic capacitor） ：10uF 9/08/2012 Logic input 1 www.onsemi.com (Circuit diagram of the evaluation board) C2 0.01uF 1 P-GND P-GND OUT1 10uF C1 + VM 2 OUT1 OUT2 19 3 OUT1 OUT2 18 4 VM 5 VM 6 VCC 7 (NC) OUT2 LIR 17 LB1843V IC1 R1 1Ω VCC P-GND 20 LIR (NC) 16 SW3 DEL 15 DEL SW2 IN2 14 IN2 SW1 Vref 8 (NC) IN1 13 IN1 9 Vref RD 12 RD 10 (NC) S-GND 11 S-GND VIN 9/08/2012 2 www.onsemi.com Evaluation Board Manual [Supply Voltage] VCC (3 to 9V): 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 switchs “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 DEL, IN1 and IN2 terminals according to the purpose (See LB1843V datasheet). Truth Table Input Output Mode IN1 IN2 OUT1 OUT2 L L Off Off Standby H L H L Forward L H L H Reverse H H L L Brake Output Current Limitation and Detector Output DEL OUT output RD Limit L Non-limit Off Saturated Off H L DC motor load VCC=3V, IN2=”L” Current waveform example “motor start” Low Off DC motor load VCC=3V, IN1=”H” Current waveform example “Forward current” and “Brake current” Ch1 IN1 10V/div High Ch2 VOUT1 2V/div High High Low Low Low Forward Ch4 Icoil 200mA/div T=20ms/div 9/08/2012 Ch1 IN2 5V/div Ch2 VOUT1 2V/div Low Ch3 VOUT2 2V/div Ch3 VOUT2 2V/div Brake Standby High High Low Low Off Low Brake Ch4 Icoil 200mA/div Forward T=20ms/div 3 www.onsemi.com Sample application timing chart 1) Connect a DC motor (RL = R) between OUT1 and OUT2, and with the RD pin pulled up, input a forward rotation signal (IN1 = high, IN2 = low). Because the output is used in the saturated state at startup, set the DEL input to low. 2) The DC motor starts up, and the startup current (IST = VM/R) flows to the motor. 3) The DC motor rotates in the normal state. At this point, set the DEL input to high. 4) If the DC motor locks, the motor current IM increases to the point of Ilimit (= VLIR/(10Rf)), the output current limiter operates to limit the output current. At the same time, RD is output low from the set current detection circuit. 9/08/2012 4 www.onsemi.com