PFS7534H

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PFC (Power Factor Correction) technology has become increasingly important for power conditioning in modern power supplies. One of the most popular and reliable PFC controllers available is the PFS7534H from ProTek Devices. The PFS7534H is a dedicated boost PFC controller specially designed to meet the latest ENERGY STAR requirements and offers various features in order to streamline design, reduce component count, and enhance system reliability. This article will discuss the application fields and working principles of the PFS7534H.

Application Field:

The PFS7534H is suitable for multiple application fields, including, but not limited to, computer, communication and consumer electronics, digital displays, home appliances, industrial equipment, and medical equipment.

For computer and communication applications, the PFS7534H is ideal for compliance with EMI requirements specified in EN55022. It offers a wide input voltage range of 90~264 VAC and current range of 3A and can provide timing, over-voltage, soft-start, and short-circuit protection for improved system reliability.

For digital displays, the PFS7534H is an excellent choice for power supply design as it requires a minimum number of external components, allowing for a space-saving printed circuit board (PCB) layout. Additionally, it supports various LCD types such as TN, STN and TFT with LED backlights, and can be used in applications such as LED TV, monitors, and projectors.

For home appliance applications, the PFS7534H incorporates multiple features to meet ENERGY STAR requirements. It offers power-good timing, OVP, soft start, and low-standby-power-consumption features to optimize system efficiency and power consumption.

For medical equipment applications, the PFS7534H has a wide input voltage range of 90~275 VAC, which provides reliability for worldwide applications. Additionally, it is suitable for applications such as medical imaging and patient care equipment, as it offers OVP, short-circuit, and thermal-overload protection for improved system safety.

Working Principle:

The PFS7534H is a high-performance integrated circuit designed to control the power factor correction (PFC) in boost converter applications. It combines a boost power switching stage, a low-frequency oscillator, and error amplifier, current sense amplifier, over-voltage protection, and other related functions. It also offers remote on/off control and standby operation.

At the switch node, the PFS7534H controls the power switch using a comparator to compare the reference voltage (RV) to the sawtooth signal (SAW), allowing it to maintain a constant switching frequency and duty-cycle control (DC) ratio. The RV is generated internally by dividing down the unregulated input bus voltage precisely. The sawtooth signal is generated by the low-frequency oscillator, which is internally fixed at 110 kHz.

The error amplifier compares the fast-feedback signal (FB) with a reference voltage (REF) and provides a signal to the pulse-width-modulator (PWM) to regulate the output voltage. The FB is compared with the REF to accurately control the boost inductor’s current to provide a constant output voltage despite input line or load variations.

The PFS7534H also features an advanced constant-on-time current-mode control architecture, allowing it to provide excel-lent line and load regulation. Additionally, the PFS7534H incorporates an over-voltage protection (OVP) circuit that protects the converter from output voltage overshoot caused by excessive input voltage, excessive capacitive load, or insufficient heat sink on the external power switch.

The PFS7534H also contains thermal-overload protection (TOP) circuitry that shuts down the converter when the junction temperature of the external power switch exceeds its operating temperature limit. Once TOP is triggered, the PWM is reset and the power switch will not be re-enabled until the input voltage falls below the OVP threshold.

Overall, the PFS7534H is an excellent choice for power factor correction and boost applications. With its wide input voltage range, advanced control architecture, built-in protection and integration features, the PFS7534H is capable of efficient and reliable power conditioning in multiple application fields.

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