DEMO MANUAL DC1477B LTM4609EV: 36V , 34V IN OUT Buck-Boost DC/DC Module Regulator Description Demonstration circuit DC1477B features the LTM 4609EV, 200kHz to 400kHz to reduce undesirable frequency har- the high voltage, high efficiency, high density switch mode monics and/or parallel multiple modules for even higher buck-boost power module. The LTM4609EV regulates output current. The LTM4609 data sheet must be read in an output voltage above, below, or equal to the input conjunction with this demo manual prior to working on voltage. DC1477B accepts an input voltage from 10V or modifying demo circuit DC1477B. to 36V with a preset output voltage of 30V at up to 3A. Design files for this circuit board are available at Derating may be necessary for certain V , V , and IN OUT DEMO MANUAL DC1477B Quick s tart p D Demonstration circuit DC1477B is an easy way to evalu- 5. To measure input and output ripple, please refer to ate the performance of the LTM4609EV. Please refer to Figure 2 for proper setup. Figure 1 for proper measurement equipment setup and 6. To adjust the switching frequency turn off the power follow the procedure below: supply and modify R6 and R7. Do not allow voltage at 1. Place jumpers in the following positions for a typical pin PLLFLTR to exceed 2.4V. 30V application: OUT 7. Inductor and R should be modified to accom- SENSE modate certain input and output condition. Refer to RUN CLOCK MODE START the data sheet for details. ON PROG CCM SSO 8. The input filter formed by CIN2, L2 and L3, CIN3 and 2. With the power supply off, connect the input power CIN4 is for the purpose of reducing the input voltage supply, load and meters as shown in Figure 1. Preset ripple. The magnetic beads L2 and L3 are not necessary, the load to 0A and V supply between 10V to 36V. IN but they help to reduce the high frequency ringings on 3. Turn on the power at the input. The output voltage the input supply significantly. See Figure 5 for details. should be 30V 2%. 9. The optional components Rsnb1 and Csnb1, Rsnb2 and 4. Once the proper output voltage is established, adjust the Csnb2 can be used to form RC snubber circuits on the load within the operating range and observe the output switching nodes, which may help to reduce the output voltage regulation, ripple voltage, efficiency and other ripple. Refer to the data sheet for details. parameters. A cooling fan and heat sink are necessary for V <10V and I = 3A. IN OUT dc1477bfa 2 ure roce