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CXSU63306: high performance low power PFC controller enabling high efficiency power supply systemjAn嘉泰姆

In the field of display, communication equipment, server and industrial power supply, efficient power factor correction (PFC) circuit is the key to improve energy efficiency. As a continuous conduction mode active PFC controller designed for medium and high power switching power supplies, CXSU63306 is becoming an ideal choice for optimizing power supply design due to its ultra-low power consumption, high integration and multiple protection mechanisms.jAn嘉泰姆

Core Characteristics and Technological Innovation

1. Extreme low power designjAn嘉泰姆

a. Start-up current as low as 17 μA (typical), up to a maximum of 75 μA, supports high-resistance start-up resistors, significantly reducing standby losses.jAn嘉泰姆

B. The turn-off current is only 400 μA, which meets strict standby energy efficiency standards (such as EU CoC V5 Tier 2).jAn嘉泰姆

C. operating current typical value of 2.3mA(65kHz mode), reduce the peripheral capacitor capacity requirements, accelerate the system start-up.jAn嘉泰姆

2. Multi-frequency version flexible adaptationjAn嘉泰姆

Three switching frequency models are available, covering different application scenarios:jAn嘉泰姆

a.CXSU63306A：65kHz（58-72kHz）jAn嘉泰姆

b.CXSU63306B：133kHzjAn嘉泰姆

c.CXSU63306C：200kHzjAn嘉泰姆
The fixed frequency design simplifies EMI filtering and reduces system noise interference.jAn嘉泰姆

3. Industrial protection functionjAn嘉泰姆

a. Safety protection: ± 1.5A drive capability with cycle-by-cycle current limit to protect MOSFET;jAn嘉泰姆

B. Voltage monitoringInput power-down undervoltage protection (UVLO), output overvoltage protection (OVP ± 10%), open-loop protection;jAn嘉泰姆

c. Intelligent adjustment: Soft start reduces switching stress, over power limit (OPL) automatically adjusts the load;jAn嘉泰姆

d. Thermal protection: 150 ℃ shutdown, 120 ℃ recovery, to prevent overheating damage.jAn嘉泰姆

Analysis of Key Performance Parameters

Application Design Optimization Highlights

1. Simplify the peripheral circuitjAn嘉泰姆
SOP8 package integrates multipliers, dividers and THD optimization circuits, requiring only few external components, reducing BOM cost and PCB footprint. The typical application circuit (Figure 6-1) shows that basic configurations such as C1/C2 capacitors and voltage dividing resistors can realize stable PFC function.jAn嘉泰姆

2. Fast transient response mechanismjAn嘉泰姆
The original "low voltage detection acceleration" technology: when the output voltage is lower than 95% of the set value, the internal 200μA current source is activated, which greatly improves the loop response speed and avoids the risk of undervoltage caused by startup or load mutation.jAn嘉泰姆

3. Intelligent energy efficiency managementjAn嘉泰姆

a. Power-down detection(BO pin): monitor bus voltage (VBO_H = 1.3V/VBO_L = 0.7V), turn off PFC when input is abnormal;jAn嘉泰姆

B. Open-loop protection: Feedback disconnection automatically turns off to prevent out of control;jAn嘉泰姆

c. Adjustable shutdown: FB pin grounded for ultra-low power standby (400 μA).jAn嘉泰姆

Typical application scenarios

1. Flat panel TV/monitor power supply: 65kHz version optimizes EMI performance to meet Class B standards;jAn嘉泰姆

2. Server/communication power supply: 200kHz high frequency model reduces inductor volume and improves power density;jAn嘉泰姆

3. Desktop computer power supply: soft start over power limit to ensure multi-output stability;jAn嘉泰姆

4. Industrial off-line power supply:-45 ℃ ~ 125 ℃ wide temperature range supports harsh environment.jAn嘉泰姆

Electrical characteristicsjAn嘉泰姆

1. Working principlejAn嘉泰姆
The CXSU63306 is a fixed frequency, continuous conduction mode PFC driver designed for use. Fixed Frequency Operation Simplifies Electromagnetic Interference (EMI)jAn嘉泰姆
Conformance to standards and limits the radiated noise that may contaminate the surrounding system. In addition, the continuous conduction mode reduces the current change rate of the applicationjAn嘉泰姆
(dI/dt) and the resulting interference. In addition, the CXSU63306 has low cost, high reliability and high power factor, is the ideal choice for switching power supply systemjAn嘉泰姆
Choose. It integrates all the necessary features to build a compact and reliable PFC function.jAn嘉泰姆
2. Low power consumption and shutdown functionjAn嘉泰姆
CXSU63306 the typical starting current is only 17uA, a starting resistor with a large resistance value can be used, which can reduce the power consumption of the starting resistor.jAn嘉泰姆
The working current of the CXSU63306 is only 2.3mA, which can meet the small power supply capacitor of the chip and can be started quickly.jAn嘉泰姆
Through the feedback pin FB grounding, the shutdown function can be realized, and the power consumption at this time is very small, so as to meet the more stringent standby low power consumption regulations.jAn嘉泰姆
Fan.jAn嘉泰姆
3. Maximum current limitjAn嘉泰姆
When the inductor current is greater than the current limit value set by the CXSU63306, the CXSU63306 turns off the output to protect the power tube from overcurrent damage. SpecialjAn嘉泰姆
This scheme can effectively protect the PFC circuit when a large inrush current charges the output capacitor during the start-up phase.jAn嘉泰姆
This maximum current limiting feature is essential to protect the power switches and other components of the PFC stage from possible excessive current stress.jAn嘉泰姆
It can prevent the equipment from being damaged during the start-up phase or under high current conditions, thereby improving the reliability and service life of the equipment. This characteristic alsojAn嘉泰姆
This makes the CXSU63306 a robust and reliable PFC driver capable of protecting the system from overcurrent pressures under a wide variety of operating conditions.jAn嘉泰姆
4. Output undervoltage protection and shutdownjAn嘉泰姆
The circuit detects when the feedback voltage is less than about 8% of the set voltage. In this case, the circuit will shut down and its consumption will drop to an extremelyjAn嘉泰姆
low value. This feature protects the PFC circuit from starting to operate under low AC input conditions or feedback network faults.jAn嘉泰姆
This under-voltage protection function can prevent the device from starting under low voltage conditions, thereby avoiding possible device damage or failure. If the feedback electricityjAn嘉泰姆
When the pressure is lower than the set minimum limit, the circuit will automatically shut down, thereby reducing the energy consumption of the device. This feature can not only improve the reliability of the equipment,jAn嘉泰姆
It can also extend the service life of the equipment. In addition, this feature can also reduce the cost of repairing and replacing equipment, thereby reducing overall costs. ThisjAn嘉泰姆
These features make the CXSU63306 an extremely robust and reliable PFC driver.jAn嘉泰姆
5. Fast transient correspondingjAn嘉泰姆
Due to the low bandwidth of the loop price adjustment, the output voltage of the PFC circuit may be caused by sudden changes in the load or input voltage (for example, at startup).jAn嘉泰姆
And there is overcharge or undervoltage. If the output voltage is too far from the set voltage:jAn嘉泰姆
Overvoltage protection: Once the output voltage exceeds the OVP threshold (105% of the set voltage), the CXSU63306 will turn off the power switch. Therefore,jAn嘉泰姆
A cost-and size-effective low-voltage class of bulk capacitors suitable for this application,jAn嘉泰姆
Output voltage low voltage detection: when the output voltage is lower than 95% of its set voltage, the CXSU63306 through its internal 200μA enhanced current source polejAn嘉泰姆
The earth speeds up the regulating loop.jAn嘉泰姆
These features enable the CXSU63306 to respond quickly to changes in power and load conditions, providing stable and precise power regulation. Overvoltage protectionjAn嘉泰姆
Protection can prevent equipment damage that may be caused by high output voltage, while low output voltage detection can be used quickly when the output voltage is lower than the set threshold.jAn嘉泰姆
Adjust the power supply quickly to prevent unstable operation or failure of the equipment. These characteristics further enhance the robustness of the CXSU63306 as a PFC driver andjAn嘉泰姆
Reliability.jAn嘉泰姆
6. Power-down detectionjAn嘉泰姆
The circuit can detect a low AC input condition and disable the PFC circuit in this case. This protection is mainly to protect the power switch fromjAn嘉泰姆
Excessive pressure, because it may be damaged under such conditions.jAn嘉泰姆
When the power supply voltage is lower than the normal operating voltage, the power switch may be subjected to excessive current, which may cause overheating and possible damage.jAn嘉泰姆
Bad. The power-down detection function can automatically turn off the PFC stage when this situation is detected, thereby protecting the power switch from excessive pressure. This kind of workjAn嘉泰姆
It can improve the reliability of the equipment and extend its service life. In addition, it can also reduce the cost of maintenance and replacement of equipment, thereby reducing the total.jAn嘉泰姆
operating costs. These features make the CXSU63306 an extremely robust and reliable PFC driver.jAn嘉泰姆
7. over power limitjAn嘉泰姆
The maximum allowable input current is CXSU63306 calculated from the power-down detection input voltage. When the circuit detects over-power transfer, it resets the pulse width modulationjAn嘉泰姆
(PWM) latch, and pull down the whole block output until the calculated power drops to the normal range. This ability to self-adjust allows CXSU63306jAn嘉泰姆
It can maintain stable operation under various power conditions while preventing equipment damage.jAn嘉泰姆
8. Temperature protectionjAn嘉泰姆
When the chip operating temperature exceeds 150 ℃, the internal thermal protection circuit will turn off the PWM output. When the temperature drops below about 120 ℃, the chipjAn嘉泰姆
Resume normal operation.jAn嘉泰姆
9. Soft StartjAn嘉泰姆
When the CXSU63306 is turned off, VC is pulled low. At this time, the VCC voltage is lower than the undervoltage protection value and the output is turned off. The soft start function is enabledjAn嘉泰姆
This is done when disabling the "200μA enhanced current source. Therefore, only 20 μA is used to charge the VC external capacitor, and the VC voltage is slowly increased.jAn嘉泰姆
This is to obtain a slowly increasing duty cycle, thereby reducing the voltage and current stress on the external power MOSFET.jAn嘉泰姆
10. Gate DrivejAn嘉泰姆
The CXSU63306 has a built-in ± 1.5A gate driver that efficiently drives medium to high power MOSFETs.jAn嘉泰姆

ConclusionjAn嘉泰姆

CXSU63306 addresses the energy efficiency and reliability pain points of medium and high power supplies with an innovative low power architecture and full protection. Its multi-frequency options, SOP8 package and simplified design features provide engineers with cost-effective PFC solutions, especially for the development of next-generation power products that need to meet energy efficiency standards such as DoE/CoC.jAn嘉泰姆

Data source: CXSU63306 Technical Manual (version: CXSU63306.pdf)jAn嘉泰姆

If you need detailed PDF specifications, please scan WeChat and contact us. You can also get free samples and technical support.!jAn嘉泰姆
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