产品概述 返回TOPrMj嘉泰姆
CXAC85191是一种高度集成的电流型PWM控制芯片，对高性能、低待机功率和低成本的离线反激转换器应用程序进行了优化。</span>正常操作的PWM开关频率在外部可编程，并被调整到窄幅。在无负载或轻载状态下，芯片以扩展的“间歇振荡模式”运行，以减少开关损耗。从而实现了较低的待机功率和更高的转换效率。</span>VDD低启动电流和低工作电流在启动设计上</span>CXAC85191提供了可靠的电源。因此，可以在启动电路中使用一个比较大电阻来减小待机功率。</span>内部的斜波补偿提高了系统的大信号稳定性，降低了高PWM工作周期输出可能的二次谐波振荡。在电流检测输入端的前沿消隐消除了由于阻尼电路二极管反向恢复而产生的信号故障。这极大地减少了应用程序中的外部器件数量和系统成本。</span>rMj嘉泰姆
CXAC85191提供了完善的保护功能模块，自动恢复功能包括周期循环的过流保护(OCP)、过载保护(OLP)、超温保护(OTP)、VDD过电压保护(OVP)和低电压锁定(UVLO)。为了保护功率MOSFET，Gate驱动输出箝位在18V。</span>rMj嘉泰姆
在CXAC85191中，OCP阈值斜率在内部优化，达到了通用交流输入范围的恒定输出功率极限。</span>rMj嘉泰姆
优良的EMI特性是在图腾柱门驱动输出中实现抖频技术和软开关控制。</span>rMj嘉泰姆
在工作中20KHZ以下的音频能量最小化，因此音频噪声的性能得到了很大的提高。</span>rMj嘉泰姆
CXAC85191提供了SOP8和DIP8封装。</span>rMj嘉泰姆
CXAC85191 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VDD low startup current and low operating current contribute to a reliable power on startup design with CXAC85191. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves system large signal stability and reduces the possible sub-harmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch due to snubber circuit diode reverse recovery. This greatly helps to reduce the external component count and system cost in application. CXAC85191 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), VDD over voltage protection (OVP) and under voltage lockout (UVLO). The Gate-drive output is clamped at 18V to protect the power MOSFET. In CXAC85191, OCP threshold slope is internally optimized to reach constant output power limit over universal AC input range. Excellent EMI performance is achieved frequency shuffling technique together with soft switching control at the totem pole gate drive output. The tone energy at below 20KHZ is minimized in operation. Consequently, audio noise erformance is greatly improved. CXAC85191 is offered in both SOP-8 and DIP-8 packagesrMj嘉泰姆
产品特点 返回TOPrMj嘉泰姆
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增强式突发模式控制为提高效率和最小待机功率设计</span>；</span>rMj嘉泰姆
无噪声操作；rMj嘉泰姆
外置可调整的PWM开关频率；rMj嘉泰姆
内置同步斜率补偿；</span>rMj嘉泰姆
低VIN / VDD启动电流(6.5 ua)和低工作电流(2.3mA)；</span>rMj嘉泰姆
在电流检测输入上内置前沿消隐；</span>rMj嘉泰姆
完善的保护和自动恢复功能；</span>rMj嘉泰姆
外置可调整的过温保护(OTP)；</span>rMj嘉泰姆
内置OVP和</span>UVLO保护；</span>rMj嘉泰姆
Gate输出最大电压箝位（18V）；rMj嘉泰姆
内置周期循环的过流保护（OCP）；rMj嘉泰姆
内置过载保护（</span>OLP）；rMj嘉泰姆
采用SOP8和</span>DIP8封装。</span>rMj嘉泰姆
◆ Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design. rMj嘉泰姆
◆ Audio Noise Free Operation rMj嘉泰姆
◆ External Programmable PWM Switching Frequency rMj嘉泰姆
◆ Internal Synchronized Slope Compensation rMj嘉泰姆
◆ Low VIN/VDD Startup Current(6.5uA) and Low Operating Current (2.3mA) rMj嘉泰姆
◆ Leading Edge Blanking on Current Sense Input rMj嘉泰姆
◆ Complete Protection Coverage With Auto Self-Recovery rMj嘉泰姆
◆ External Programmable Over Temperature Protection (OTP) rMj嘉泰姆
◆ On-chip VDD OVP for System OVP Under Voltage Lockout with Hysteresis (UVLO) rMj嘉泰姆
◆ Gate Output Maximum Voltage Clamp (18V) rMj嘉泰姆
◆ Line Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Current Limiting Over Universal Input Voltage Range (OCP) rMj嘉泰姆
◆ Over Load Protection. (OLP) rMj嘉泰姆
应用范围 返回TOPrMj嘉泰姆
◆ Laptop Power Adaptor rMj嘉泰姆
◆ PC/TV/Set-Top Box Power rMj嘉泰姆
◆ Supplies Open-frame SMPS rMj嘉泰姆
◆ Battery ChargerMj嘉泰姆
技术规格书（产品PDF) 返回TOP rMj嘉泰姆
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