MAXIM MAX5015ESA+

The MAX5014/MAX5015 integrate all the building blocks necessary for implementing DC-DC fixed-frequency isolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for isolated telecom/industrial voltage range power supplies. Current-mode control with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabilizes the current loop when operating at duty cycles above 50% (MAX5014). The MAX5014 allows 85% operating duty cycle and could be used to implement flyback converters, whereas the MAX5015 limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter component costs. Use the MAX5014/MAX5015 PWM current-mode controllers to design flyback- or forward-mode power supplies. Current-mode operation simplifies control-loop design while enhancing loop stability. An internal high-voltage startup regulator allows the device to connect directly to the input supply without an external startup resistor. Current from the internal regulator starts the controller. Once the tertiary winding voltage is established the internal regulator is switched off and bias current for running the IC is derived from the tertiary winding. The internal oscillator is set to 275kHz and trimmed to ±10%. This permits the use of small magnetic components to minimize board space. Both the MAX5014 and MAX5015 can be used in power supplies providing multiple output voltages.

• Wide Input Range: (18V to 110V) or (13V to 36V)
• Current-Mode Control
• Leading-Edge Blanking
• Internally Trimmed 275kHz ±10% Oscillator
• Low External Component Count
• Soft-Start
• High-Voltage Startup Circuit
• Pulse-by-Pulse Current Limiting
• Thermal Shutdown
• SO-8 Package

• Telecom Power Supplies
• Industrial Power Supplies
• Networking Power Supplies
• Isolated Power Supplies