Description:Adjustable Over Power Protection (OPP) Circuit, Disabled at Low Line; Adjustable Brown Out Level; Frequency Foldback down to 26 kHz and Skip−cycle in Light Load Conditions; Internally−fixed Slope Compensation Ramp; Internally−fixed 4−ms Soft−start; 70−ms Timer−based Auto−recovery Short−circuit Protection; Frequency Jittering in Normal and Frequency Foldback Modes; Double Hiccup Auto−recovery Short−circuit Protection; Pre−short Ready for Latched OCP Option; Latched OVP Protection on Vcc; Latched Inputs for I
A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, and ensuring good thermal conductivity between the device and the heat sink. A 2-layer or 4-layer PCB with a solid ground plane can also help to reduce thermal resistance.
To ensure reliable start-up of the converter in a noisy environment, it is recommended to add a soft-start circuit to limit the inrush current and reduce electromagnetic interference (EMI). Additionally, using a high-quality input filter and a low-ESR output capacitor can help to reduce noise and improve start-up reliability.
The maximum allowed voltage on the enable pin is 6V. Exceeding this voltage may damage the device. It is recommended to use a voltage divider or a level shifter to ensure that the enable pin voltage does not exceed 6V.
The output voltage ripple of the converter can be calculated using the following formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ΔVout is the output voltage ripple, Iout is the output current, ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
The recommended input capacitor type is a low-ESR ceramic capacitor with a value of 10uF to 22uF. A higher value capacitor can be used for improved input ripple rejection, but it may increase the start-up time of the converter.
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NCP1256ESN65T1G Overview
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