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CXAC85255: innovative high-voltage power supply design of the all-round half-bridge PWM control chipMVm嘉泰姆

In the field of electric vehicle charging, industrial power supply and high-power LED drive, efficient and stable high-voltage control chip is the core of the system. As a highly integrated 600V half-bridge PWM control chip, CXAC85255 is becoming the industry's preferred solution due to its excellent performance.MVm嘉泰姆

1. core characteristics analysisMVm嘉泰姆

1. High voltage drive capability:The integrated 600V half-bridge driver can directly drive the external MOS transistor, supporting up to 600V input voltage, greatly simplifying the design of high-voltage power supply.MVm嘉泰姆

2. Intelligent frequency control:The operating frequency of 20Hz-500kHz can be set by a single external capacitor (CP pin) to meet the needs of different application scenarios. Frequency calculation formula:MVm嘉泰姆
F = (11.8 × 10 ⁶)/CP(Cp in pF)MVm嘉泰姆

Multiple protection mechanismsMVm嘉泰姆

a. Intelligent undervoltage lockout (UVLO):VCC turn-on voltage 16V (typical)/turn-off voltage 8V(CXAC85255)MVm嘉泰姆

B. Cycle-by-cycle current limit protection: 180mV threshold current detection via SDHIN/SDLIN pinMVm嘉泰姆
C. road protection: VCC power off automatically turn off PWM, to avoid short power tube damageMVm嘉泰姆

4. High precision reference: Built-in 5V reference voltage (± 2% accuracy), load adjustment rate ≤ 50mV, providing a stable reference for the feedback circuit.MVm嘉泰姆

2. typical application scenariosMVm嘉泰姆

1. Electric vehicle charging systemMVm嘉泰姆

a. Support 72V/15A lead-acid battery charger solution (1300W):MVm嘉泰姆

B. Electric tricycle/motorcycle chargerMVm嘉泰姆

c. Battery isolation converterMVm嘉泰姆

2. Industrial power supplyMVm嘉泰姆

a. High-power high-frequency switching power supplyMVm嘉泰姆

B. UPS uninterruptible power supplyMVm嘉泰姆

c. Inverter power supplyMVm嘉泰姆

3. Lighting field: High-power LED drive power supply, support constant voltage and constant current control.MVm嘉泰姆

3. Key Design GuideMVm嘉泰姆

1. Power supply designMVm嘉泰姆

A. VCC pin needs to be equipped with 22μF energy storage capacitor, which affects the response time of short circuit protectionMVm嘉泰姆

B. REF5V pin is recommended to add 1μF ceramic capacitor to filter noiseMVm嘉泰姆

2. Frequency configurationExample: 100pF capacitance for 118kHz frequency (typical), voltage rejection ratio <± 5%MVm嘉泰姆

3. Peak current limit setting: through the MOS tube series resistance to achieve:Iₚₖ = 180mV / RsMVm嘉泰姆
(Rs for high and low end MOS tube detection resistance)MVm嘉泰姆

4. Dead zone control: Built-in 500ns minimum dead time, effectively preventing the bridge arm from passing through.MVm嘉泰姆

4. Innovation WorkflowMVm嘉泰姆

1. Soft start mechanism:SS pin external capacitor control start slope, avoid inrush current.MVm嘉泰姆

2. Intelligent short circuit protectionMVm嘉泰姆

a. ChartsMVm嘉泰姆

B. Code graph LR
A [output short circuit] --> B[VCC voltage drop]
B --> C{VCC<8V?}
C -->| Yes | D [PWM off]
D --> E [capacitor charging]
E --> F{VCC>16V?}
F -->| Yes | G [Restart PWM]
c. Driving ability: 2A pull current/2.5A sink current output, can quickly switch MOS tube.

5. encapsulation and parametersMVm嘉泰姆

1.SOP-16 PackageSize 10.0 × 4.0mm(MAX), compatible with automatic placementMVm嘉泰姆

2. Working temperature:-45 ℃ to 125 ℃MVm嘉泰姆

3. Energy efficiency characteristics：MVm嘉泰姆

a. Start-up current only 200 μA (typical)MVm嘉泰姆

B. PWM maximum duty cycle 47.5%MVm嘉泰姆

Summary of advantages of 6. schemeMVm嘉泰姆
CXAC85255 improves system reliability by integrating half-bridge drive, PWM control, and protection circuits on a single chip:MVm嘉泰姆

1. Reduce peripheral components by more than 30% and reduce BOM costMVm嘉泰姆

2.500ns leading edge blanking (LEB) technology effective anti-jammingMVm嘉泰姆

3. Support gap type short circuit protection mode, reduce the thermal stress of power tubeMVm嘉泰姆

4. Compatible with lead-acid/lithium battery charging management requirementsMVm嘉泰姆

The chip has been widely used in the design of 1300W high-power chargers. Its high integration and industrial temperature range (-45~125 ℃) make it an ideal choice for new energy transportation and industrial power supply. Engineers can quickly adapt to different power levels by adjusting the CP capacitance and current limiting resistor, significantly shortening the product development cycle.MVm嘉泰姆

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

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   Product packaging diagramMVm嘉泰姆

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   Circuit schematicMVm嘉泰姆

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  Related Chip Selection Guide                 More similar products..... MVm嘉泰姆

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