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FULL DATA SHEET (PDF, 336kB) Download   E-Mail The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-frequency power supplies. Either primary- or secondary-side regulation may be used to implement isolated or nonisolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for 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% (MAX5019). The MAX5019 allows 85% operating duty cycle and can be used to implement flyback converters whereas the MAX5020 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. The MAX5019/MAX5020 are available in 8-pin SO packages. Warning: The MAX5019/MAX5020 operate with high voltages. Exercise caution.

Key Features		Applications/Uses
Wide Input Range: (18V to 110V) or (13V to 36V) Isolated (without optocoupler) or nonisolated power supply 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		Industrial Power Supplies Isolated Power Supplies Networking Power Supplies Telecom Power Supplies

Diagram

Typical Operating Circuit

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