DC2240A

Demonstration circuit 2240A is a synchronous four quadrant converter featuring the LT®8714 switching controller. The LT8714 can regulate to positive, negative or zero volts when configured as a four-quadrant topology. The DC2240A regulates from a 10V to 14V input source to an adjustable output voltage from positive 5V to negative 5V with a 5A maximum current rating, and operates at 200kHz switching frequency. The LT8714 incorporates a power good feature to let the user know if the output voltage is within its target regulation voltage. The LT8714 has an output voltage control (CTRL) pin which sets the output voltage. The DC2240A has a jumper to select the CTRL pin voltage source from either externally (EXT) or internally (INT). If selected internally, the output voltage can be set to +5V or –5V. If selected externally, the output voltage can vary between positive 5V and negative 5V, following a 0.1V – 1V CTRL signal with high bandwidth.

• Positive output voltage ripple of 25mVP-P (VIN = 10V – 14V, VOUT = 5V, IOUT = 5A (20MHz BW))
• Negative output voltage ripple of 200KHz (VIN = 10V – 14V, VOUT = –5V, IOUT = –5A (20MHz BW))
• Efficiency of 89% at VIN = 12V, VOUT = 5V, IOUT = 5A

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