MAX17497A データシート PDF

部品番号 : MAX17497A

詳細 : (MAX17497A/B) AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step-Down Regulator

メーカー : Maxim Integrated

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MAX17497A datasheet

部品情報 :

General Description
The MAX17497A/MAX17497B include both a current mode fixed-frequency flyback converter and a synchronous step-down regulator. They contain all the control
circuitry required to design wide input-voltage noniso lated power supplies to supply multiple output rails for smart meters, industrial control, and other similar applica
tions. The MAX17497A has its rising/falling undervoltage lockout (UVLO) thresholds optimized for universal offline (85V AC to 265V AC) applications, while the MAX17497B
supports undervoltage lockout (UVLO) thresholds suit able to low-voltage DC-DC applications. Both devices also include a 3.3V fixed-output synchronous step-down
regulator that delivers up to 600mA load current. The switching frequency of the MAX17497A flyback converter is 250kHz, while the MAX17497B flyback/ boost converter is 500kHz. The internally compensated synchronous step-down regulator switches at 1MHz on both versions. These frequencies allow the use of tiny magnetic and filter components resulting in compact, cost-effective power supplies. An EN/UVLO input allows the user to start the power supply precisely at the desired input voltage, while also functioning as an on/off pin. The OVI pin enables implementation of an input overvoltage protection scheme that ensures the converter shutsdown when the DC input voltage exceeds the desired maximum value.

Benefits and Features
♦Reduced Component Count and Board Space
 Flyback/Boost with Integrated Internally Compensated Step-Down Regulator
 No Current-Sense Resistor
 Space-Saving 16-Pin (3mm x 3mm) TQFN Package
♦ Minimal Radio Interference
 250kHz Switching in Offline Version Minimizes Interference with Radio Receivers
in Smart Meter Applications
♦ Reduced Inrush Current
 Programmable Flyback/Boost Soft-Start  Internal Digital Soft-Start for Step-Down
♦ Reduced Power Dissipation Under Fault
 Hiccup Mode Overcurrent Protection Thermal Shutdown with Hysteresis
♦ Robust Protection Features
 Flyback/Boost Programmable Current Limit Input Overvoltage Protection
♦ Optimized Loop Performance
 Programmable Slope Compensation for Flyback/Boost Maximizes Obtainable Phase
♦ High Efficiency
 Low RDSON, 150mI, 65V-Rated Internal nMOSFET
 3.3V Step-Down Regulator Efficiency Greater Than 90%
♦ Optional Spread Spectrum

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