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CXAC85264: innovative 5v reference output reconstruction Charger power supply designoUj嘉泰姆

In the field of fast charging technology and industrial power supply, high precision control and system simplification have become the core demands. CXAC85264 current mode PWM controller provides revolutionary solutions for medium and high power flyback/forward power supply by integrating 5v reference voltage source and intelligent voltage clamp technology, significantly reducing BOM cost and improving system reliability.oUj嘉泰姆

I. Breakthrough technical characteristicsoUj嘉泰姆

CXAC85264 three major innovative designs directly hit the pain points of the industry:oUj嘉泰姆

1. Precision voltage referenceoUj嘉泰姆

a. Independent REF pin output 5V ± 5% reference voltage (4.9-5.5V)oUj嘉泰姆

B. Maximum 5mA drive capability replaces external TL431, saving 2 peripheral devicesoUj嘉泰姆

c. Temperature drift <± 1%(-45 ℃ ~ 125 ℃ full temperature zone)oUj嘉泰姆

2. Dynamic protection systemoUj嘉泰姆

| Protection mechanism | Trigger threshold | Response speed | Technical advantages |
| ---------------- | ---------------- | ------------ | ------------------------ |
| VCC overvoltage clamp | >20V automatic start | Nanoseconds | Clamp 17.5v anti-MOS breakdown |
| Frontier blanking | 250ns fixed duration | Takes effect every cycle | Eliminates current detection spikes |
| Hiccup mode | Light load 21kHz switching | 55ms latency | Standby power consumption <100MW |

3.EMI optimization architectureoUj嘉泰姆

a. Frequency range ± 4%(65kHz center frequency)oUj嘉泰姆

B. Built-in slope compensation eliminates subharmonic oscillationoUj嘉泰姆

II. Analysis of key performance parametersoUj嘉泰姆

1. Energy efficiency controloUj嘉泰姆

a. The lowest starting current in the world (3 times lower than that of competing products)oUj嘉泰姆

B .2.3mA ultra-low operating current (VCC = 18V)oUj嘉泰姆

c. Green mode conversion efficiency> 89%(10% load)oUj嘉泰姆

2. Precise controloUj嘉泰姆

a. Current limiting threshold 0.9V ± 5% (full temperature range)oUj嘉泰姆

B. PWM gain 2.8V/V ensures loop stabilityoUj嘉泰姆

3. Driving capabilityoUj嘉泰姆

III. Typical Application Design GuideoUj嘉泰姆

1. Three-stage lead-acid battery charger(Figure 6-2)oUj嘉泰姆

a. Use the REF pin to directly drive optocoupler, eliminating the reference ICoUj嘉泰姆

B .46% duty cycle optimized trickle charging stage efficiencyoUj嘉泰姆

2. Wide voltage lithium battery charger(Figure 6-3)oUj嘉泰姆

a.VCC clamp function to deal with 36V transient voltage shockoUj嘉泰姆

B .30ms overload delay protection against false triggeringoUj嘉泰姆

3. Motor drive power supplyoUj嘉泰姆

a. Slope compensation to suppress the risk of magnetic saturationoUj嘉泰姆

B. Cold start at-45℃ to ensure the reliability of industrial equipmentoUj嘉泰姆

IV. Deep optimization of electrical characteristicsoUj嘉泰姆

1. Safety protection systemoUj嘉泰姆

2. Precise frequency controloUj嘉泰姆

Formula: F_osc(kHz)=3640/RI(kΩ)oUj嘉泰姆
56 Kohm resistor achieves 65kHz switching frequencyoUj嘉泰姆

V. Packaging and thermal designoUj嘉泰姆

3. Selection comparison: CXAC85264 vs traditional solutionsoUj嘉泰姆

4. Key design tipsoUj嘉泰姆

a.REF pin needs to be connected with 0.1 ohm F decoupling capacitor (from chip <2mm)oUj嘉泰姆

B. RI resistance accuracy must be ± 1% (to ensure the effectiveness of frequency jitter)oUj嘉泰姆

c. Hiccup mode entry condition: FB voltage <1.5V lasts for 3 cyclesoUj嘉泰姆

Conclusion: redefine new standards for power integrationoUj嘉泰姆
CXAC85264 with the original 5v reference output and dynamic voltage clamp technology, the contradiction between accuracy and safety in charger design is solved. Its 6µa ultra-low starting current feature is especially suitable for intermittent power supply scenarios such as solar charging, while 65kHz ± 4% TikTok technology can easily pass EN55022 Class B certification. For engineers who develop cost-effective chargers and adapters, the chip can reduce peripheral devices by 40% and improve system reliability by 200%.oUj嘉泰姆

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

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   Product packaging diagramoUj嘉泰姆

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   Circuit Schematic diagram oUj嘉泰姆

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  Relevant chip selection guideMore similar products.....oUj嘉泰姆

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