Tag Archives: ON Semiconductors

App note: Charging capacitive loads with eFuse

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App note from ON Semiconductors on how eFuse manage to cope up with large capacitive loads. Link here (PDF)

The eFuse protection devices are used for limiting the system load current in the events of overload or short circuit. Many applications employ On Semiconductor eFuses at the power input stage of the system between the main power input connector and DC−DC converters or power regulators. The systems utilizing eFuse protection devices at the power input stage may represent inductive, resistive, capacitive or mixed types of loads.
One of the common load characteristics for various systems is large capacitive load, typically starting from 1mF all the way to few hundred milli Farads. The challenge presented by such load to an overcurrent protection system is large inrush current due to the excessive capacitance which will cause the device to shut down during startup.

App note: Tuning linear redrivers

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App note from ON Semiconductors about linear redrivers setting. Linear redrivers are used in systems in order to improve high speed signal integrity in systems transmitting digital data. Link here (PDF)

Linear redrivers are used in many applications that transmit data at high speeds. They can be found on computer motherboards, gaming consoles, graphics cards, cables, and any other environment that transmits digital data. More specific examples of common applications using linear redrivers include USB, DisplayPort, HDMI, PCIe, and SATA ports.

App note: LV5980MC step-down switching regulator

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Single chip high efficiency step-down converter, app note from ON Semiconductors. Link here (PDF)

The LV5980MC is a fixed 370 kHz, high−output−current, Non−synchronous PWM converter that integrates a low−resistance, high−side MOSFET and a Customer Chosen, External Diode for the rectification. The LV5980MC utilizes externally compensated current mode control to provide good transient response, ease of implementation, and excellent loop stability. It regulates input voltages from 4.5 V to 23 V down to an output voltage as low as 1.235 V and is able to supply up to 3.0 A of load current. The LV5980MC includes Power Save Feature to enhance efficiency during Light Load. In low consumption mode, the device show operating current of 63 A from VIN by shutting down unnecessary circuits.

App note: Designing a PSR Quasi-Resonant adaptor driven by the NCP1362

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ON Semiconductor’s app note featuring 12V 12W adaptor design using NCP1362 primary side regulation controller with valley lockout that hold its switching frequency at light loads. Link here (PDF)

Quasi−square wave resonant converters also known as Quasi−Resonant (QR) converters are widely used in the adaptor market. They help designing flyback Switched−Mode Power Supply (SMPS) with a reduced Electro−Magnetic Interference (EMI) signature and improved efficiency.

App note: PCB layout guidelines for high frequency signaling products

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High speed board design app note from ON Semiconductor. Link here (PDF)

There is an increase of devices and circuitry in usage of high speed, low consumption, small volume and lower interference. Hence PCB design is an important stage of electronic product design. It forms a connection between function and electronic components, and is also an important part of power circuit design. High frequency circuit has the higher integration and the higher layout density, making it necessary to know how to make layout more reliable. The use of multilayer board becomes a necessity and an effective means to reduce cross interference of signals, better grounding and lower parasitic inductance.

This application note looks at the different layout types, practices and guidelines, types of material and factors influencing the high frequency signal transfers.

App note: Design of a 100W active clamp forward DC-DC converter for telecom systems using the NCP1562

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Another DC-DC converter design using ON Semiconductor’s NCP1562 PWM Controller. Link here (PDF)

The NCP1562 PWM controller contains all the features and flexibility needed to implement an active clamp forward dc−dc converter. This IC operates from an input supply up to 150 V, thus covering the input voltages usually found in telecom, datacom and 42 V automotive systems. One can also note that the NCP1562 can be used in mains related applications (e.g. desktop, server, flat TVs) as it can be supplied by an auxiliary power supply