NCP1055ST44T3

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NCP1055ST44T3 Application Field and Working Principle

The NCP1055ST44T3 is a high efficiency, low idle power, low cost controller IC utilizing peak current-mode control. It is a specially designed device for controlling DC/DC converters in primary-side off-line applications such as white goods, LED drivers, and industrial power supplies. NCP1055ST44T3 is part of the PMIC (Power Management Integrated Circuit) family – AC DC Converters, Offline Switchers.

Features:

• Up to 80% efficiency
• 50% energy saving
• OVP, OLP, SCP
• Low Standby Power Dissipation of 145mW @ 230VAC
• Cycle-by-Cycle Over Current Protection
• Built-in PWM Dimming Interface
• Built-in Soft-Start timer

Application fields:

• Power Supplies
• Automotive Electronic Applications
• LED Drivers
• AC/DC Adapter Drivers
• Power Converters

Working Principle:

NCP1055ST44T3\'s working principle is based on peak current-mode control. The power stage is connected to the chip\'s VCC pin and the current of the power stage is sensed by the CS pin. The current is then compared with a programmed reference voltage at the IC internal comparator. This causes a change in the output voltage of the comparator, which switches the power MOSFET at the appropriate time. When the power switch is on, the energy stored in the inductor is transferred to the output capacitors. When the power switch is off, the energy stored in the inductor is transferred to the internal power MOSFET. The device uses only primary-side sensing and closed-loop control, making it easier to implement in offline applications and providing the user with higher efficiency and greater flexibility.

All in all, the NCP1055ST44T3 is an IC that can be used in a variety of offline applications. It has a high efficiency and low idle power, offering up to 80% efficiency and a low standby power dissipation of 145mW @ 230VAC. It also features OVP, OLP, and SCP and has built-in PWM dimming and soft-start. NCP1055ST44T3 can be used in a variety of fields, ranging from power supplies, automotive electronics and LED drivers to AC/DC adapter drivers and power converters.

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