DEMO MANUAL DC1992A LT8620 65V, 2A Micropower Synchronous Monolithic Step-Down Regulator Description Demonstration circuit 1992A is a 65V, 2A micropower The demo board has an EMI filter installed. The board and synchronous monolithic step-down regulator featuring the IC are designed to minimize conducted and radiated the LT 8620. The LT8620 is a compact, high efficiency, EMI. The radiated EMI performances of the board are shown high speed synchronous monolithic step-down switching on Figure 2 to Figure 4. The limits on those figures are regulator that consumes only 2.5A of quiescent current CISPR25, Class 5 peak limits. It shows the circuit passes when output is regulated at 5V. Top and bottom power the test with a wide margin. switches, compensation components and other necessary The LT8620 data sheet gives a complete description of circuits are inside of the LT8620 to minimize external the part, operation and application information. The data components and simplify design. sheet must be read in conjunction with this quick start The SYNC pin on the demo board is grounded by default guide for demo circuit 1992A. for low ripple Burst Mode operation. To synchronous Design files for this circuit board are available at to an external clock, move JP1 to SYNC and apply the DEMO MANUAL DC1992A Description Figure 2. 30MHz to 1GHz Radiated EMI Performance. V = 12V, V = 5V, I = 2A IN OUT OUT Antenna Polarization: Horizontal Switching Frequency: 2MHz Figure 3. 30MHz to 1GHz Radiated EMI Performance. V = 12V, V = 5V, I = 2A IN OUT OUT Antenna Polarization: Vertical Switching Frequency: 2MHz Figure 4. 150kHz to 30MHz Radiated EMI Performance. V = 12V, V = 5V, I = 2A IN OUT OUT Antenna Polarization: Vertical Switching Frequency: 2MHz (In the Frequency Range Between 150kHz and 30MHz, Only Vertical Polarization Is Required) dc1992af 2