NCP1377D1R2G

Duty Cycle:	--
Base Part Number:	NCP1377
Mounting Type:	Surface Mount
Supplier Device Package:	7-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width), 7 Leads
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	--
Fault Protection:	Current Limiting, Over Temperature, Over Voltage
Frequency - Switching:	Up to 100kHz
Series:	--
Voltage - Supply (Vcc/Vdd):	7.5 V ~ 18 V
Voltage - Start Up:	12.5V
Topology:	Flyback
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Background

NCP1377D1R2G is a high performance, low power offline switcher system-in-package (SIP). This device has been designed to enable standby current in the range of 0.5 mA and application voltage up to 28V. It is suitable for applications such as isolated DC/DC converter and isolated AC/DC converters with low operating current and small form factor.

Application Field

NCP1377D1R2G is ideal for cost-sensitive, power-limited, highly integrated offline applications. It is suitable for AC/DC flyback, forward and polarised converter solutions consuming less than 20 W. This device can be used in various applications such as Business Equipment, Telecommunications, Automotive, Industrial Supplies, Home Appliances, LED Lighting, and consumer electronics.

Features & Benefits

NCP1377D1R2G device features an optimized Ohmic circuit design to reduce losses and thermal dissipation. It also offers excellent efficiency and high power saving within a small size. It supports wide input voltage range and can be applied to both direct AC input and rectified AC input solutions. The device is built with dedicated phase support, reducing discontinuous mode operation and cost of design.

Working Principle

The NCP1377D1R2G device is a buck type high performance flyback converter. This device supports a wide input voltage range of 85-265VAC and an output voltage specific to application requirements. It also features an array of advanced technologies to reduce losses and improve efficiency. The overall system performance is mainly affected by the working principle of the device. It consists of six main components - a MOSFET, a diode, a diode bridge, a transformer, an opto-coupler, and a PWM. The MOSFET is used to control the primary winding current, to which the diode acts as a rectifier. The rectified current then flows through a diode bridge and generates a negative output voltage for the secondary winding of the transformer. The opto-coupler is used to control the primary side MOSFET gate voltage which controls the switching frequency.Finally, a pulse-width modulation (PWM) controller is used to regulate the output voltage and provide switching current regulation. The core of the PWM controller is a working cycle, during which the peak primary current is limited either by a current sense resistor (or a current sense amplifier) connected to the source pin of the MOSFET, or by the voltage drop across the internal MOSFET body-diode. Thus, the peak secondary current can be regulated by adjusting the output voltage.

Conclusion

NCF1377D1R2G device is a high performance, low power offline switcher solution ideal for applications with cost-sensitive, power-limited, and high-integrated requirements. The device offers an array pf features, such as wide input voltage range, excellent efficiency, advanced technologies, and dedicated phase support. The device utilizes an optimized Ohmic circuit design along with a buck type high performance flyback converter, using components such as MOSFET, diode, diode bridge, transformer, opto-coupler, and pulse-width modulation (PWM) controller.

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