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CXAC85197S PWM Controllers: A Core Solution for High-Performance Power Management

In modern power electronic systems, efficient and stable PWM controller is the core driving force.CXAC85197SAs an integrated industrial-grade chip, with wide voltage input, precise reference source and flexible dead-time control, it has become an ideal choice for inverter power supply, high-power switching power supply and DC speed control system. This paper will analyze its key features, typical applications and design points in depth.hA6嘉泰姆

1. Core Features: Born for Complex Applications

1. Wide pressure input and high precision referencehA6嘉泰姆

a. Operating voltage range8V to 35VAdapt to industrial voltage fluctuations.hA6嘉泰姆

B. Built-in5.1V±2%The reference voltage source can directly provide reference for the error amplifier, reducing external components.hA6嘉泰姆

2. Oscillator and synchronization functionhA6嘉泰姆

a. Frequency range100Hz~500kHz, Adjusted by external resistance (RT) and capacitance (CT) (formula:f=1/(0.7Rt 3Rd)·Cr）。hA6嘉泰姆

B. SYNC pinSupport master-slave mode synchronization, multi-chip work together to avoid interference.hA6嘉泰姆

3. Key protection mechanismshA6嘉泰姆

a. Adjustable dead time: Connect a resistor (Rd) between CT (pin 5) and DISCHARGE (pin 7) to adjust the dead zone to prevent the power tube from passing through.hA6嘉泰姆

B. Undervoltage lockout (UVLO): When VCC<8V, the output is forcibly turned off to ensure system safety.hA6嘉泰姆

c. Soft start function: External capacitor to SOFT START (pin 8), charged by internal 50μA constant current source to realize smooth power-on.hA6嘉泰姆

3 Strong drive and shutdown controlhA6嘉泰姆

a. Dual channel push-pull output (OUTPUT A/B),Peak current 500mADirect drive MOSFET.hA6嘉泰姆

B. SHUTDOWN (pin 10): The high level immediately turns off the output and discharges the soft-start capacitor, which supports fast fault protection.hA6嘉泰姆

2. typical application scenarios

1. Inverter power supply(Figure 6-1)hA6嘉泰姆

CXAC85197S-driven half-bridge/full-bridge topology, AC output is controlled by adjusting the PWM duty cycle (typically 45% ~ 49%), suitable for UPS and solar inverters.hA6嘉泰姆
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2. High-power switching power supply(Figure 6-2)hA6嘉泰姆

a. Half-bridge architecture using complementary output (pin 11/14) drive power tube, supportHigh-frequency switching above 100kHz.hA6嘉泰姆

B. The error amplifier (pin 1/2) combines COMP (pin 9) with an external PI compensation network to improve voltage regulation accuracy.hA6嘉泰姆
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3.DC/DC converter and chargerhA6嘉泰姆

a. Wide input voltage compatible with 12V/24V system, built-in reference source to simplify the feedback design.hA6嘉泰姆

B. Soft start reduces inrush current and prolongs capacitor life.hA6嘉泰姆

Key Points of 3. Design

1. Oscillator ConfigurationhA6嘉泰姆

2. Protection function optimizationhA6嘉泰姆

a.SHUTDOWN pinIt is necessary to ground through resistance to avoid the introduction of noise in the air.hA6嘉泰姆

B. Short-time shutdown signal to achieve pulse current limit; long-time shutdown triggers soft-start reset.hA6嘉泰姆

3.PCB Layout RecommendationshA6嘉泰姆

a. Power ground (GND, pin 12) is separated from signal ground to reduce interference.hA6嘉泰姆

B. VCC (pin 15) with the nearest high frequency decoupling capacitor.hA6嘉泰姆

Summary of 4. performance parameters (@ Vcc = 15V, TA = 25 ℃)

ConclusionhA6嘉泰姆
The CXAC85197S provides a reliable core for industrial power supply design with high integration, strong drive and multiple protection functions. Its wide voltage input, flexible frequency adjustment and soft start characteristics, especially suitable for high reliability requirements of inverter and switching power supply system. The design should focus on the oscillator configuration and protection circuit optimization to give full play to the chip performance.hA6嘉泰姆

Extended applicationCombined with external MOSFET and transformer, it can be extended to wireless charging, motor drive and other high-frequency fields to meet diversified energy conversion needs.hA6嘉泰姆

If you need detailed PDF specifications, please scan WeChat and contact us. You can also get free samples and technical support.!hA6嘉泰姆
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   Product packaging diagramhA6嘉泰姆

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   Circuit schematichA6嘉泰姆

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  Related Chip Selection Guide             More similar products..... hA6嘉泰姆

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