Simplified Block Diagram
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- 48V Input, Isolated Power-Supply Modules
- ADSL Line Cards
- ADSL Line-Driver Power Supplies
- Distributed Power Systems with 48V Bus
- High-Efficiency Telecom/Datacom Power Supplies
- IEEE 802.3af PD Power Supplies
- Isolated IP Phone Power Supplies
- WLAN Access-Point Power Supplies
The EV kit uses the MAX5074 IC that includes internal power MOSFETs. High efficiency up to 85% at 1.2A is achieved using an internally clamped two-transistor topology. Part of the efficiency improvement is due to the recovery of stored leakage and magnetizing inductance energy at the primary side.
The MAX5074 is programmed to switch at 250kHz. The undervoltage lockout (UVLO) threshold is programmed to 30V and the integrated fault protection provides effective fault management. Output galvanic isolation is achieved by an optocoupler and the surface-mount power transformer.
Warning: The MAX5074 EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriate to working with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.
The EV kit user should not probe the circuit with an oscilloscope probe and ground clip unless they have experience with high voltages.