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MAX5019 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX5019 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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General Description The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-fre- quency 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 start- up circuit suitable for telecom/industrial voltage range power supplies. Current-mode control with leading- edge blanking simplifies control-loop design and inter- nal 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 for- ward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching fre- quency 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. Applications Telecom Power Supplies Industrial Power Supplies Networking Power Supplies Isolated Power Supplies Features o Wide Input Range: (18V to 110V) or (13V to 36V) o Isolated (without optocoupler) or Nonisolated Power Supply o Current-Mode Control o Leading-Edge Blanking o Internally Trimmed 275kHz ±10% Oscillator o Low External Component Count o Soft-Start o High-Voltage Startup Circuit o Pulse-by-Pulse Current Limiting o Thermal Shutdown o SO-8 Package Current-Mode PWM Controllers with Integrated Startup Circuit ________________________________________________________________ Maxim Integrated Products 1 GND CS 1 2 8 7 VCC NDRV VDD FB V+ 8-SO TOP VIEW 3 4 6 5 MAX5019/ MAX5020 SS_SHDN Pin Configuration Ordering Information NDRV VIN VOUT VDD VCC CS FB MAX5020 V+ SS_SHDN GND Typical Operating Circuit 19-2115; Rev 0; 7/01 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP. RANGE PIN-PACKAGE MAX5019CSA* 0 °C to +70°C8-SO MAX5019ESA* -40 °C to +85°C8-SO MAX5020CSA* 0 °C to +70°C8-SO MAX5020ESA* -40 °C to +85°C8-SO *See Selector Guide at end of data sheet. |
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