Description:Quasi-fixed TON, Variable TOFF Current Mode Control
•Extremely Low Current Consumption at Startup
•Peak Current Compression Reduces Transformer Noise
•Primary or Secondary Side Regulation
•Dedicated Latch Input for OTP, OVP
•Programmable Current Sense Resistor Peak Voltage
•Natural Frequency Dithering for Improved EMI Signature
•Easy External Over Power Protection (OPP)
•Undervoltage Lockout
•Very Low Standby Power via Off-time Expansion
•SOIC-8 Package
• Standard Overcurrent Protection, Latched
A good PCB layout for the NCP1351ADR2G should prioritize thermal management, with a solid ground plane and thermal vias to dissipate heat. The input and output capacitors should be placed close to the IC, and the feedback network should be routed to minimize noise and parasitic inductance.
The input capacitor should be a low-ESR ceramic capacitor with a value of 10uF to 22uF, while the output capacitor should be a low-ESR ceramic or electrolytic capacitor with a value of 22uF to 47uF. The capacitor selection should also consider the voltage rating, ripple current, and temperature range.
The NCP1351ADR2G can operate in an ambient temperature range of -40°C to +125°C, but the maximum junction temperature should not exceed 150°C. The device should be derated for high-temperature operation to ensure reliable performance.
To ensure stability, the NCP1351ADR2G requires a minimum output capacitance of 22uF, and the feedback network should be properly compensated. The device should also be operated within the recommended input voltage range, and the output voltage should not be loaded with a high-capacitance load.
The NCP1351ADR2G can handle an input voltage range of 4.5V to 18V, but the maximum input voltage should not exceed 20V to prevent damage to the device.
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NCP1351ADR2G Overview
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