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CXAC85258: innovative half-bridge topology power supply design highly integrated controllerTG2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.TG2嘉泰姆

1. Breakthrough Technology FeaturesTG2嘉泰姆

1. High integration architectureTG2嘉泰姆

a. Built-in 650V half-bridge driver to streamline peripheral circuitsTG2嘉泰姆

B. Support series/parallel/LLC resonant topology, operating frequency up to 500kHzTG2嘉泰姆

c. Configurable dead time (100ns-2μs) to prevent straight-through of upper and lower tubesTG2嘉泰姆

2. Intelligent control functionTG2嘉泰姆

a, programmable soft-start mechanism to avoid inrush currentTG2嘉泰姆

B. Light load hiccup mode (Skip Mode) to achieve <300μA ultra-low standby power consumptionTG2嘉泰姆

c. Feedback voltage (FB) linear adjustment frequency (1.1V -5.5V corresponding to 50kHz-500kHz)TG2嘉泰姆

Multiple protection mechanismsTG2嘉泰姆

a. Over-current self-recovery: Fault pin double threshold detection (1.05V/1.55V)TG2嘉泰姆

B. Input undervoltage lockout (BO pin):28μA hysteresis current precise monitoringTG2嘉泰姆

C. temperature protection (TSD):120 ℃ shutdown 30 ℃ hysteresisTG2嘉泰姆

2. Key Design GuideTG2嘉泰姆

1. Frequency configuration schemeTG2嘉泰姆

2. Dead time optimizationTG2嘉泰姆

a. External resistor adjustment via DT pin (Pin7):TG2嘉泰姆

B .3kΩ & rarr; 100ns (minimum)TG2嘉泰姆

c.82kΩ & rarr; 2μs (max.)TG2嘉泰姆

3. Fault handling logicTG2嘉泰姆

a. Overcurrent protectionWhen Fault>1.05V, start the timer, and Ctimer capacitor is charged to 4V to turn off the outputTG2嘉泰姆

B. Automatic recovery: Soft start restart after capacitor discharge to 1VTG2嘉泰姆

c. Latch protection: BO pin> 4V trigger permanent latch, VCC<6.5V reset requiredTG2嘉泰姆

3. Typical Application Circuit DesignTG2嘉泰姆

1. Start timing controlTG2嘉泰姆

a. Auxiliary power supply scheme: LO is turned on before HO, and the bootstrap capacitor is pre-charged (Figure 8-1)TG2嘉泰姆

B. No auxiliary winding scheme: VCC rising slope is managed by starting resistor (Figure 8-2)TG2嘉泰姆

2. Optocoupler interface configurationTG2嘉泰姆

a.FB pin control: suitable for output voltage regulation (Figure 8-18)TG2嘉泰姆

B. Rt pin control: to achieve open-loop frequency adjustment (Figure 8-19/8-20)TG2嘉泰姆

3. Latch protection circuitTG2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 faultsTG2嘉泰姆

4. Electrical Performance HighlightsTG2嘉泰姆

5. Application Scenario ExtensionTG2嘉泰姆

The flexible configuration of the CXAC85258 makes it widely applicable:TG2嘉泰姆

1. High density power supply: 500kHz high frequency switch reduces transformer volumeTG2嘉泰姆

2. Fast charging adapter: Hiccup mode optimizes light load efficiencyTG2嘉泰姆

3. Medical EquipmentROHS-Compliant Halogen-Free Design Full Protection MechanismTG2嘉泰姆

4. Communication power supply:-40 ℃ ~ 125 ℃ industrial temperature rangeTG2嘉泰姆

ConclusionTG2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.TG2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.TG2嘉泰姆

If you need detailed PDF specifications, please scan WeChat and contact us. You can also get free samples and technical support.!TG2嘉泰姆
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   Product packaging diagramTG2嘉泰姆

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   Circuit schematicTG2嘉泰姆

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  Related Chip Selection GuideMore similar products.....TG2嘉泰姆

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