Description:Integrated 700 V MOSFET with RDS(on) of 2.7 Ω; Current-Mode Fixed Frequency Operation (65 & 100 kHz) - 130 kHz for B version only; Peak Current: NCP1079A/B = 1,050mA; Skip-Cycle Operation at Low Peak Current; Dynamic Self-Supply (DSS); Auto-Recovery Output Short Circuit Protection with Timer-Based Detection; Frequency Foldback Operation; 300 µA No Load Power Consumption; Frequency Jittering (including during frequency foldback mode); Adjustable Brown-out Protection and OVP; Over Power Protection; 2nd Level
A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, using thermal vias to dissipate heat, and keeping the copper traces wide and short to reduce thermal resistance.
To ensure reliable startup and shutdown, make sure to follow the recommended startup and shutdown sequences, use a soft-start circuit to limit inrush current, and add a UVLO (Under-Voltage Lockout) circuit to prevent the device from operating at low input voltages.
When designing an EMI filter for the NCP1079BBP100G, critical components to consider include the input filter capacitors, output filter inductors, and the layout of the filter components to minimize radiation and conduction of EMI.
To optimize the output voltage ripple, use a low-ESR output capacitor, add a snubber circuit to reduce ringing, and optimize the feedback loop compensation to minimize the output voltage ripple.
Key considerations for thermal derating include the device's power dissipation, ambient temperature, and airflow. Derate the device's power rating according to the datasheet's thermal derating curve to ensure reliable operation.
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NCP1079BBP100G Overview
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