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CXAC85260: innovative high-performance PWM controller for high-power power supply design

In the field of LED display screen, battery charger and industrial power supply, efficient and reliable PWM controller is the core driving force.CXAC85260As a current mode PWM controller optimized for medium and high power forward/flyback power supply,38V wide voltage input,Excellent EMI performanceAndFull protection integrationFeatures, becoming the preferred solution for engineers.SBL嘉泰姆

I. Overview of core features

1. Wide voltage and efficient designSBL嘉泰姆

a. Support input voltage up to 38V to adapt to complex industrial environment.SBL嘉泰姆

B. Only few peripheral devices are needed, which significantly reduces the system cost and PCB space occupation.SBL嘉泰姆

Ultra-low starting current (6μa) and work Current (2.3mA) improve energy efficiency and accelerate start-up.SBL嘉泰姆

2.EMI optimization technologySBL嘉泰姆

a. Built-inFrequency jitter function, adjustable switching frequency (68-83kHz), through the formulaFosc(KHz)=4200/RI(KΩ)Flexible setting to effectively suppress electromagnetic interference.SBL嘉泰姆

B. CombinationCutting-edge blanking technology(80ns), eliminate the current detection spike when power tube is turned on, and avoid false triggering.SBL嘉泰姆

3. Multiple protection mechanismsSBL嘉泰姆

a. Input undervoltage protection (BO pin): automatically turn off when the detection voltage is lower than 0.95V to prevent low voltage damage.SBL嘉泰姆

B. NTC temperature protection (RT pin): external thermistor, 75μa constant flow source trigger threshold (1v shutdown/1.1V recovery).SBL嘉泰姆

c.VCC overvoltage/undervoltage protection: UVLO threshold (10.5V on/16V off), overvoltage clamp 42V(10mA).SBL嘉泰姆

d. Cycle-By-Cycle current limiting (CS pin): accurate detection of overcurrent (threshold 1v±8%), response delay is only 120ns.SBL嘉泰姆

II. Deep analysis of key functions

1. Intelligent Drive and Output Protection

a.OUT pinDrive capacity up to 20mA, built-in 18V voltage clamp to prevent VCC from breaking down the gate of the MOSFETs too high.SBL嘉泰姆

B .50% Maximum duty cycle design, suitable for forward/flyback topology, matchingCXBD3531The two-tube forward excitation scheme can be realized (Figure 6-1).SBL嘉泰姆

2. Frequency setting and TikTok technology

a.RT pinExternal Resistance (such as 56kΩ) sets the reference frequency, and ± 4% frequency range optimizes EMI conduction test.SBL嘉泰姆

B. Frequency jitter disperses harmonic energy to simplify filter circuit design.SBL嘉泰姆

3. Protection functions work together

a. Optocoupler open circuit protection Overload protection: The FB pin voltage exceeds 4.6V and triggers 55ns delayed shutdown.SBL嘉泰姆

B. VCC multiple protection: Triple Protection of undervoltage (UVLO), overvoltage (VOP 39V), and Zener clamp.SBL嘉泰姆

3. Typical application scenarios

1.LED display power: low ripple current control ensures display uniformity, and temperature protection meets the heat dissipation challenge in a closed environment.SBL嘉泰姆

2. Battery charging system: Lead-acid/lithium battery charger: wide voltage compatible with 12V/24V battery pack, Undervoltage protection to prevent deep discharge.SBL嘉泰姆

3. Industrial adapter and motor drive: The dual-tube forward architecture (Figure 6-2) supports 90-264vac input and is suitable for auxiliary power supply of frequency converter.SBL嘉泰姆

IV. Packaging and electrical specifications

1.SOP8 package: compact size (4.8 × 6.0mm), which meets the high-density layout requirements of industrial automation equipment.SBL嘉泰姆

2. Electrical limit parameters:SBL嘉泰姆

a. Operating Temperature:-45 ℃ ~ 125 ℃SBL嘉泰姆

B. VCC withstand voltage: 40V (transient)/clamp current 10mASBL嘉泰姆

c. Welding heat resistance: 300℃(10s)SBL嘉泰姆

Conclusion

Passed CXAC85260High integration protection,Flexible frequency configurationAndUltra-low power design, greatly improve the reliability of power system. Its SOP8 package and simplified peripheral circuit provide a cost-effective solution for LED drivers, Chargers and industrial power supplies, which is an ideal choice to replace traditional PWM controller.SBL嘉泰姆

For detailed PDF specifications, please scan WeChat and contact us. You can also get free samples and technical support.!SBL嘉泰姆

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   Product packaging diagramSBL嘉泰姆

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   Circuit Schematic diagramSBL嘉泰姆

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  Relevant chip selection guide More similar products.....SBL嘉泰姆

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