产品概述 返回TOPnct嘉泰姆

     CXAC85249 is a high performance peak current mode PWM controller. CXAC85249employs Quasi-Resonantand frequency foldback technique to reduce EMI and improve average efficiency and meets the latest Level VI efficiency standard with enough margin. Its burst mode operation enables low standbypower with small output voltage ripple. And it achieves very low standby power, good dynamic response and accurate voltage regulation with an opto-coupler and the secondaryside control circuit. With build-in fast start process, CXAC85249can get output voltage very short rise time even with a big capacitive load.And a soft start circuit keeps output voltage no overshoot at power up. In full load conditions, CXAC85249can work in both CCM mode and DCM mode to meet different types of applications. Quasi-Resonant (QR) function works all the time in DCM modes. CXAC85249can be directly used for Quick-Charger Class A solution because of its 7-37V wide VCC operation voltage range. CXAC85249integrates comprehensive protection. In case of over temperature, input/output over voltage, winding short, current sense resistor short, open loop, output short, over load and over current conditions, it would enter into auto restart if recovering from fault mode. Cycle-by-Cycle current limiting ensuressafeoperationeven duringfault mode and recovering. CXAC85249is for applications up to 50 Watts. CXAC85249is in a tiny SOT23-6 package.CXAC85249一种高性能峰值电流模式PWM控制器。CXAC85249用准谐振和频率折返技术，以降低EMI和提高平均效率，并满足最新的VI级能效标准，而且具有足够的余量。通过光耦合器和次级侧控制电路实现了非常低的待机功率、良好的动态响应和精准的电压调整率。通过内置快速启动过程，CXAC85249使在电容性负载较大的情况下也能获得非常短的上升时间。软启动电路在上电时保持输出电压无过冲。在满负载条件下，CXAC85249以在CCM模式和DCM模式下工作，以满足不同类型的应用。准谐振( QR)谷底技术在DCM模式下始终工作。
  CXAC85249具有7 -37V宽VCC工作电压范围，可直接用于A类快速充电器解决方案。
  CXAC85249成了全面保护。当出现过温、输入/输出过压、绕组短路、电流检测电阻短路、开环、输出短路、过载、过流等情况时，检测到故障条件进入自动重启打嗝模式。当故障去除后自动恢复正常工作。逐周期限流确保即使在故障模式和恢复期间也能安全运行。
  CXAC85249用于50瓦以下的应用。
  CXAC85249用SOT 23 -6封装。

   产品特点 返回TOPnct嘉泰姆

 Quasi-Resonant and CCM Operation nct嘉泰姆

 7-37V VCC Widely Operation Voltage Range nct嘉泰姆

 Very Low Standby Power Consumption nct嘉泰姆

 OCP/OLP/OSP Protection nct嘉泰姆

 Current Sense Resistor Short Protection nct嘉泰姆

 Transformer Winding Short Protection nct嘉泰姆

 Integrates Comprehensive Protection nct嘉泰姆

 Built-in Soft-Start and Fast-Start Circuit nct嘉泰姆

 Gate Output Voltage Clamped at 12V nct嘉泰姆

 Built-inAdjustable SlopeCompensation nct嘉泰姆

 Complies with DOE VI and CEC V5 Average Efficiency Standards nct嘉泰姆

 Tiny SOT23-6 Packagenct嘉泰姆

   应用范围 返回TOPnct嘉泰姆

 Conventional Adapter nct嘉泰姆

 Quick-Charge Adapter nct嘉泰姆

 USB PD Adaptors nct嘉泰姆

 ReplacementsforlineartransformersandRCCSMPSnct嘉泰姆

   技术规格书（产品PDF) 返回TOP nct嘉泰姆

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