DEMO MANUAL DC1743A LTM4613 8A, High Voltage Power Module Regulator Description Demonstration circuit DC1743A features the LTM 4613EV, voltage margining can also be realized through jumper an EN55022 class B certified, high input and output voltage, position selections. high efficiency, switch mode step-down power Module Higher efficiency at low load currents is achieved by setting regulator. The input voltage range is from 5V to 36V. The the MODE pin jumper to DCM. The PLL pin is available output voltage is jumper programmable from 3.3V to 12V to synchronize the LTM4613EV to an external clock. The with a rated load current of 8A. Derating is necessary LTM4613 data sheet must be read in conjunction with for certain V , V , frequency and thermal conditions: IN OUT this demo manual prior to working on or modifying demo please refer to LTM4613 data sheet for derating curves. circuit DC1743A. Only input and output capacitors are needed externally. Design files for this circuit board are available at The DC1743A offers the TRACK/SS pin allowing the user DEMO MANUAL DC1743A q Uick st Art proce DU Demonstration circuit DC1743A is an easy way to evalu- 4. Vary the input voltage from 5V to 36V and adjust the ate the performance of the LTM4613EV. Please refer to load current from 0A to 8A. Observe the output voltage Figure 1 for proper measurement equipment setup and regulation, ripple voltage, efficiency, and other param- follow the procedure below: eters. 1. Place jumpers in the following positions for a typical 5. To measure input or output ripple, insert the scope 3.3V application: probe to J7 or J4. OUT MODE MARG1 MARG0 V SELECT RUN 6. For optional load transient test, apply an adjustable pulse OUT CCM LO LO 3.3V ON signal between IOSTEP CLK and GND test points. The pulse amplitude sets the load step current amplitude. 2. With power off, connect the input power supply, load The pulse duty cycle should be low (< 5%) to limit the and meters as shown in Figure 1. Preset the load to 0A thermal stress on the load transient circuit. The load and V supply to be 0V. IN step current can be monitored with a BNC connected 3. Turn on the power at the input. Increase V to 12V to J3 (20mV/A). The output voltage can be monitored IN (do not hot-plug the input supply or apply more than at the probe jack J4. the rated maximum voltage of 36V to the board or the part may be damaged). The output voltage should be regulated and deliver the selected output voltage 2%. dc1743af 2 re