DEMO MANUAL DC1819A LTC4415EMSE Dual 4A Ideal Diodes with Adjustable Current Limit DESCRIPTION Demonstration circuit 1819A features the LTC 4415EMSE EN1 and EN2. As initially configured, by setting to BOTH dual ideal diodes. Each independent ideal diode can be the user can apply input voltages and loads on each diode used to replace a standard diode for improved low forward independently. Selecting PRIORITY allows the LTC4415 to drop in applications requiring maximum headroom and automatically switch over between inputs when the proper overall system efficiency. input voltage threshold on IN1 is achieved. The input supply voltage ranges are from 1.7V to 5.5V for Status and warning LEDs and test points are provided for each input/output pair. As initially configured, LTC4415 can the logic output pins STAT1, STAT2 and WARN1, WARN2, provide a maximum current limit of 4A for each diode, respectively. but is jumper-selectable up to 6A (internal current limit). Optionally, the LTC4415EDHC version can also be used The voltage of the current limit pins, CLIM1 and CLIM2, for evaluation. It is a pin-compatible drop-in replacement. can also be monitored for a scaled representation of the Design files for this circuit board are available at output current. DEMO MANUAL DC1819A QUICK START PROCEDURE Demonstration circuit 1819A is easy to set up to evaluate Optional the performance of the LTC4415. Refer to Figure 1 for 1. For prioritization enable switchover set jumper JP1 to proper measurement equipment setup and follow the PRIORITY. procedure below. 2. For independent, external control of the enable pins, 1. Set the jumpers as below: remove the shunt on jumper JP1. Apply the logic control signal on EN1 and EN2 as necessary. JP1 JP2 JP3 BOTH 4A 4A 3. With all power off, change the CLIM1 and CLIM2 settings on jumpers JP2 and JP3 for different current limits. 2. With all power off, connect input 1 and 2 (VIN1 and 4. For load sharing or evaluation of the diode-OR func- VIN2) power supplies capable of at least 4A each, the tion, connect the two diode outputs, OUT1 and OUT2, loads (VOUT1 and VOUT2), and meters as shown in together. The source of highest voltage will appear at Figure 1. the output. 3. Preset the system loads to 0A and the input supplies 5. For independent path control from a common input, to 0V, 0A current limit. connect the two diode inputs, IN1 and IN2, together. 4. Turn on the supplies, setting the current limit above 4A. Adjust the voltages to the desired value, up to 5.5V. 5. Turn on the loads and adjust as necessary. 6. Monitor CLIM1 and CLIM2 pin voltages for a scaled representation of the output currents. 7. Adjust the supply voltages further and observe how the output states change accordingly. STAT1 and STAT2 will change state if the input voltage drops below the UVLO threshold. 8. Adjust the loads into current limit and observe how the WARN1 and WARN2 states change accordingly. dc1819afa 2