Analog Devices LT8710 | Demoboard DC2067A

Description

Demonstration circuit 2067A is a synchronous inverting converter (CUK topology) featuring the LT®8710 switching controller. It regulates a –5V, 6A output from a 4.5V to 28V input source, and operates at 300kHz switching frequency.The LT8710 features simple negative or positive output voltage programming. The DC2067 programs a –5V output with a single resistor.At light load, the LT8710 can operate at forced continuous conduction mode (CCM) or discontinuous conduction mode (DCM), set by its MODE pin. The DC2067A selects DCM, which maintains high efficiency at light load.The DC2067A can be modified from a CUK converter to other topology. Synchronous SEPIC and synchronous BOOST schematics are provided in the data sheet. Please consult the factory or LT8710 data sheet for details regarding how to customize the DC2067A or how to design different topologies for custom specifications.There are some optional components on the DC2067A to facilitate modifications; see Full Schematic Diagram for component designation.1. The optional N-FET (MN2) or P-FET (MP2) could be added to increase power delivery and improve thermal dissipation.2. The optional RC snubber (R4, C1) across the flying capacitor could help to damp the feedback control loop for some applications using two separate inductors.3. The optional input capacitors (CIN5, CIN6) or output capacitors (CO5, CO6) could be installed to reduce voltage ripple for some low voltage and/or high current applications.4. The optional RC (R24, C19) snubber could be installed to damp the switch node spike and reduce the EMI noise.5. The optional current sensing resistor filters (located near CSP and CSN pins, ISP and ISN pins) might be required in certain applications with excessive switching noise.The LT8710 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2067A.

Typical applications

• Lead AcidBatteryCharger
• SolarPanelPower control
• Automotive Engine ControlUnit(ECU)Power
• HighPowerLocalPowerSupply
• Wide InputVoltageRangeSEPIC/Inverting

More information

• Datasheet
• IC product information