DC2519A

Demonstration circuit 2519A is a high voltage, high efficiency synchronous buck-boost DC/DC converter with a 16V to 120V input voltage range. The demo board features the LTC®3777EFE controller. The constant frequency current mode architecture allows a phase-lockable frequency of up to 600KHz, while an optional output current feedback loop provides support for applications such as battery charging. The 150V integrated switching bias supply is a high efficiency step-down regulator that draws only 12μA typical DC supply current with a regulated output voltage at no load. With a wide input range, wide output range and seamless transfers between operation modes, the LTC3777 is ideal for industrial, automotive, medical, military and avionics applications. The light load operation mode of the converter is determined with the MODE pin. Use JP2 jumper to select pulse skipping mode or forced continuous mode (CCM) operation. To shut down the converter, force the RUN pin below 1.2V (SW1: OFF).

• Typical efficiency of 98.7% (48VIN, 48VOUT, 10A)
• Typical output ripple of 480mV (48VIN, 48VOUT, 10A)
• 10A maximum load current with a 48V output
• Switching frequency is pre-set at about 200KHz
• Can also be externally synchronized to external clock through PLLIN pin (PLLIN terminal on board)
• Power good output (PGOOD terminal) is low when output voltage is outside of ±10% regulation window

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