MAX256 Evaluation Kit

The MAX256EVKIT+ evaluation kit (EV kit) is a fully assembled and tested PCB that contains a 3W isolated H-bridge DC-DC converter. The circuit is configured for unregulated output voltages of approximately +5V and -5V (with respect to an isolated ground). Output current is up to 600mA from either output, or 300mA from each of the two outputs. Input power for the circuit is provided from a +5VDC source, or operates at any input voltage down to +3V with a corresponding reduction in the output voltages. The EV kit provides greater than 85% overall efficiency at +5V between 250mW and 2W output power using an H-bridge DC-DC converter topology. Input ripple current and radiated noise are minimized by the inherent balanced nature of the design with no interruption in the input current. Under voltage lockout (UVLO) and thermal shutdown provide for a robust 3W isolated supply. The surface-mount transformer provides up to 1500VRMS galvanic isolation with each output powered from a center-tapped full-wave rectifier circuit to reduce output voltage ripple. Operation at 400kHz allows the use of ceramic output capacitors and a small transformer.

• +3V to +5VDC Input Range
• Isolated Outputs
  • +Vout: +5V Provides Up to 300mA
  • -Vout: -5V Provides Up to 300mA
• 87% Overall Efficiency at +5V Input and 200mA Load
• Center-Tapped, Full-Wave Rectifier Output
• 400kHz Switching Frequency
• 2.7V Under voltage Lockout (UVLO)
• Designed for 1500VRMS Isolation
• Low-Cost, Integrated-FET H Bridge Design
• Fully Assembled and Tested
• 8-pin SO-EP Package
• 0°C to +70°C Temperature