Description:Integrated 700 V MOSFET with RDS(on) of 4.7 Ω; Current-Mode Fixed Frequency Operation (65 & 100 kHz) - 130 kHz for B version only; Peak Current: NCP1076A/B = 650mA and NCP1077A/B = 800 mA; 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
A good PCB layout for optimal thermal performance involves placing the NCP1076AAP100G near a thermal pad or a heat sink, and ensuring good thermal conductivity between the device and the PCB. A 2-layer or 4-layer PCB with a solid ground plane is recommended. Additionally, it's essential to keep the thermal vias as close as possible to the device and to use a sufficient number of vias to dissipate heat effectively.
To ensure the output voltage is stable and regulated, it's essential to follow the recommended component values and PCB layout guidelines in the datasheet. Additionally, make sure to use a suitable output capacitor with a low ESR (Equivalent Series Resistance) and a high ripple current rating. It's also important to decouple the input voltage with a capacitor and to use a low-impedance input source.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and to prevent damage to the device. Applying a voltage higher than 18V can cause permanent damage to the device.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet. The output voltage ripple is primarily dependent on the output capacitor value, ESR, and the switching frequency. The noise is primarily dependent on the switching frequency, output capacitor value, and the input voltage ripple. A good starting point is to use the recommended component values and to simulate the circuit using a SPICE model or a circuit simulator.
The recommended input capacitor value is 10uF to 22uF, with a voltage rating of at least 25V. A low-ESR ceramic capacitor or a film capacitor is recommended. The input capacitor should be placed as close as possible to the device and should have a low impedance path to the input pin.
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NCP1076AAP100G Overview
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