• [ CXAC85258 ]"

Ordering

CXAC85258: innovative half-bridge topology power supply design highly integrated controllerwtE嘉泰姆

    In the field of high-efficiency power supply design, CXAC85258 is the ideal solution for display power supplies, AC-DC adapters and industrial medical equipment with its 650V integrated half-bridge drive and 500kHz high-precision oscillator. This article will analyze its core features, design advantages and typical application scenarios in depth.wtE嘉泰姆

1. Breakthrough Technology FeatureswtE嘉泰姆

1. High integration architecturewtE嘉泰姆

a. Built-in 650V half-bridge driver to streamline peripheral circuitswtE嘉泰姆

B. Support series/parallel/LLC resonant topology, operating frequency up to 500kHzwtE嘉泰姆

c. Configurable dead time (100ns-2μs) to prevent straight-through of upper and lower tubeswtE嘉泰姆

2. Intelligent control functionwtE嘉泰姆

a, programmable soft-start mechanism to avoid inrush currentwtE嘉泰姆

B. Light load hiccup mode (Skip Mode) to achieve <300μA ultra-low standby power consumptionwtE嘉泰姆

c. Feedback voltage (FB) linear adjustment frequency (1.1V -5.5V corresponding to 50kHz-500kHz)wtE嘉泰姆

Multiple protection mechanismswtE嘉泰姆

a. Over-current self-recovery: Fault pin double threshold detection (1.05V/1.55V)wtE嘉泰姆

B. Input undervoltage lockout (BO pin):28μA hysteresis current precise monitoringwtE嘉泰姆

C. temperature protection (TSD):120 ℃ shutdown 30 ℃ hysteresiswtE嘉泰姆

2. Key Design GuidewtE嘉泰姆

1. Frequency configuration schemewtE嘉泰姆

2. Dead time optimizationwtE嘉泰姆

a. External resistor adjustment via DT pin (Pin7):wtE嘉泰姆

B .3kΩ & rarr; 100ns (minimum)wtE嘉泰姆

c.82kΩ & rarr; 2μs (max.)wtE嘉泰姆

3. Fault handling logicwtE嘉泰姆

a. Overcurrent protectionWhen Fault>1.05V, start the timer, and Ctimer capacitor is charged to 4V to turn off the outputwtE嘉泰姆

B. Automatic recovery: Soft start restart after capacitor discharge to 1VwtE嘉泰姆

c. Latch protection: BO pin> 4V trigger permanent latch, VCC<6.5V reset requiredwtE嘉泰姆

3. Typical Application Circuit DesignwtE嘉泰姆

1. Start timing controlwtE嘉泰姆

a. Auxiliary power supply scheme: LO is turned on before HO, and the bootstrap capacitor is pre-charged (Figure 8-1)wtE嘉泰姆

B. No auxiliary winding scheme: VCC rising slope is managed by starting resistor (Figure 8-2)wtE嘉泰姆

2. Optocoupler interface configurationwtE嘉泰姆

a.FB pin control: suitable for output voltage regulation (Figure 8-18)wtE嘉泰姆

B. Rt pin control: to achieve open-loop frequency adjustment (Figure 8-19/8-20)wtE嘉泰姆

3. Latch protection circuitwtE嘉泰姆

Vbulk → Rupper → BO引脚  
       └→ Rlower → GND  
       └→ NTC/光耦 → 触发Q1导通

Forced latching when BO>4V to ensure system safety under extreme faultswtE嘉泰姆

4. Electrical Performance HighlightswtE嘉泰姆

5. Application Scenario ExtensionwtE嘉泰姆

The flexible configuration of the CXAC85258 makes it widely applicable:wtE嘉泰姆

1. High density power supply: 500kHz high frequency switch reduces transformer volumewtE嘉泰姆

2. Fast charging adapter: Hiccup mode optimizes light load efficiencywtE嘉泰姆

3. Medical EquipmentROHS-Compliant Halogen-Free Design Full Protection MechanismwtE嘉泰姆

4. Communication power supply:-40 ℃ ~ 125 ℃ industrial temperature rangewtE嘉泰姆

ConclusionwtE嘉泰姆
As an innovator in resonant topology control, CXAC85258 dramatically simplifies the power supply design process through highly integrated and programmable features. Its 500kHz high-frequency capability, ns-level dead-band regulation, and multiple protection architecture provide engineers with a platform-level solution that combines performance and reliability.wtE嘉泰姆

Extended Design Support: Need CXAC85258 complete design kit or LLC transformer calculation tool? Please contact our technical team for a customized solution.wtE嘉泰姆

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

  wtE嘉泰姆

   Circuit schematicwtE嘉泰姆

wtE嘉泰姆

  Related Chip Selection GuideMore similar products.....wtE嘉泰姆

◀ Previous:CXAC85257 Resonant Half-Bridge Controller-50% Duty Cycle Variable Frequency Control | 650V Drive | Energy Saving Burst Mode

Back to top

Next▶:CXAC85 259 600V Half-Bridge Drive PWM Controller-High Efficiency Power Supply Scheme Design Guide