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CXAC85261: redefine the PWM controller of medium and high power power supply designoOU嘉泰姆

In the field of adapter, lithium battery charger and industrial power supply, high efficiency, energy saving and electromagnetic compatibility (EMI) have become the core requirements. CXAC85261 the birth of current mode PWM controller is designed to solve these challenges. This cost-effective chip integrates advanced control algorithms and complete protection mechanisms, providing engineers with a one-stop power supply solution.oOU嘉泰姆

I. Breakthrough technical characteristicsoOU嘉泰姆
CXAC85261 redefine performance standards through three core technologies:oOU嘉泰姆

1.EMI optimization architectureoOU嘉泰姆

a. Built-in TikTok function makes the PWM frequency fluctuate dynamically within the range of ± 4% of the set value, effectively dispersing the electromagnetic interference spectrumoOU嘉泰姆

B. Cutting-edge blanking technology (250ns) eliminates current detection spikes when MOSFETs are turned on, improving system stabilityoOU嘉泰姆

2. Intelligent energy efficiency managementoOU嘉泰姆

a. Automatic switching of Green mode: the frequency drops to 21kHz at light load, and no load enters hiccup modeoOU嘉泰姆

B. Only 2.3mA ultra-low work current, with 6μA starting current to reduce standby lossoOU嘉泰姆

3. All-round protection mechanismoOU嘉泰姆

| Protection type | Trigger condition | Response speed |
| ---------------- | ----------------------- | ------------- |
| Temperature protection | RT pin voltage ≤ 1v | Turn off immediately |
| VCC overvoltage protection | >28.2V (typical) | Action within 0.1ms |
| Cycle-By-Cycle current limiting | CS pin> 0.96v | Nanosecond response |
| Optocoupler open circuit protection | FB voltage exception | Hiccup mode |

II. Precise engineering design controloOU嘉泰姆
The chip uses external components to flexibly configure key parameters:oOU嘉泰姆

1. Precise frequency control: The RI pin resistance (formula: Fosc(kHz)= 3640/Ri(kΩ)) can be set in the range of 60-70kHzoOU嘉泰姆

2. Temperature protection customization: external NTC resistor, 80μa constant flow source real-time monitoring temperature point (Trigger/recovery threshold: 1V/1.1V)oOU嘉泰姆

3. Power limit optimization: FB pin 4.6V threshold for overload protection, 55ms delay to prevent false triggeringoOU嘉泰姆

III. Analysis of typical application scenariosoOU嘉泰姆

1. Lithium battery charging system(Figure 6-1/6-3)oOU嘉泰姆

a. Use CXLB73136 to achieve constant voltage and constant current control in the full temperature range of 0-45 ℃oOU嘉泰姆

B .50% Maximum duty cycle ensures safe conversion during fast chargingoOU嘉泰姆

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

a. Hiccup mode solves the problem of battery gas evolution in floating charging stageoOU嘉泰姆

B. Slope compensation eliminates subharmonic oscillation riskoOU嘉泰姆

3. Industrial display screen power sourceoOU嘉泰姆

a. The frequency jitter technology has passed Class B EMI certification.oOU嘉泰姆

B. SOP8 package saves 75% PCB spaceoOU嘉泰姆

IV. Deep optimization of electrical characteristicsoOU嘉泰姆

1. Voltage adaptation: VCC operating range 9.5-28V (hysteresis design anti-oscillation)oOU嘉泰姆

2. Driving capability: 20mA source current/irrigation current, 130ns rise 50ns drop time (driving 1nF load)oOU嘉泰姆

3. Limit tolerance:oOU嘉泰姆

a.30V power supply voltage redundancyoOU嘉泰姆

B.-45 ℃ ~ 125 ℃ industrial temperature zoneoOU嘉泰姆

C.300℃ (10s) welding toleranceoOU嘉泰姆

V. Packaging and reliability assuranceoOU嘉泰姆

Dual encapsulation options are available to meet different scenarios:oOU嘉泰姆

1.SOP8: 1.27mm pin spacing, 6.2 × 5.1mm miniature designoOU嘉泰姆

2.DIP8: enhanced heat dissipation structure, supporting 150 ℃ storage temperatureoOU嘉泰姆
Pass 3000 temperature cycles (-45℃ & harr;125℃),MTBF>100,000 hoursoOU嘉泰姆

Conclusion: future-oriented power management schemeoOU嘉泰姆
CXAC85261 is becoming the benchmark of medium power supply design with its 3.5mA ultra-low operating power consumption, programmable TikTok technology and complete protection function. Especially in the field of charger application, its external NTC temperature protection and constant current precision ± 8% control capability solve the safety pain point in high temperature environment. With the explosion of LED power supply and power tools market, this highly integrated controller will provide engineers with more reliable and energy-saving design options.oOU嘉泰姆

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

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   Product packaging diagramoOU嘉泰姆

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   Circuit Schematic diagramoOU嘉泰姆

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

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