ISL81601FRZ-T

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ISL81601FRZ-T is an adjustable total harmonic distortion (THD)/Power Factor Correction (PFC) flyback converter standalone integrated circuit designed for high grade AC-DC power systems. It is ideal for desktop, notebook and server adapters, open frame applications and other low power requirements applications. This part can also be used for an isolated single output configuration up to 450 watts.

The ISL81601FRZ-T is a highly integrated, intelligent power factor correction (PFC) and DC/DC supply controller. It supports 2-stage or single stage PFC stages for high power factor design. The controller incorporates essential functions including input voltage feed forward, soft start, frequency dithering and dynamic protection. The integrated PFC MOSFET provides outstanding power density and efficiency.

The ISL81601FRZ-T is a digital control solution that can be used in various applications. It has digital control features like a programmable switching frequency, soft start, CurrentMode control, digital temperature compensation and also a programmable power up sequence. It has excellent line/load regulation together with good transient response and kickback immunity. It also features an adaptive VCC line draining protection.

The advantage of the digital control is that it can provide more flexibility in design and stability in the face of system variations. The controller can be used to realize a wide variety of flyback topology with simple minimal external components. It supports any type of power topology, from simple CCM flyback to complex MLCC resonant mode flyback. Other features include Smart Current Limit (SCL) and a programmable input undervoltage lockout (UVLO) threshold.

The working principle behind the ISL81601FRZ-T is that of a two-stage feedback loop. The control loop consists of the PFC loop, which is the outer loop responsible for controlling the system\'s power factor and AC impedance levels. The inner loop consists of power factor controller (PFC) and its associated components, which provides constant voltage output at the input of the main power stage. The inner loop works in conjunction with the outer loop to maintain the required load regulation and power factor.

The ISL81601FRZ-T is designed for applications that need high efficiency and high power quality. It is a suitable solution for AC to DC power conversion with power levels up to 450W. The part is ideal for desktop, notebook and server adapters, open frame applications and other low power requirements applications. The ISL81601FRZ-T is a preferred choice for applications where high power density, small size and high efficiency are of paramount importance.

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