CXAC8513是一款高度集成的电流模式脉宽调制控制芯片，为高性能、低待机功率和经济高效的离线反激变换器应用而优化。正常工作时的PWM开关频率是外部可编程的，并调整到很窄的范围。在空载或轻载条件下，IC以扩展的“突发模式”工作，以最小化开关损耗。VDD低启动电流和低工作电流有助于CXAC8513的可靠开机设计。因此，在启动电路中可以使用一个大值电阻以最小化备用功率。内斜率补偿提高了系统的大信号稳定性，降低了高PWM占空比输出时可能出现的次谐波振荡。电流检测输入的前沿消隐消除了缓冲电路二极管反向恢复引起的信号故障，从而大大减少了设计中的外部元件数量和系统成本。JCXAC8513提供完整的保护范围，具有自动自恢复功能，包括逐周限流（OCP）、过载保护（OLP）、VDD过电压钳位和欠电压锁定（UVLO）。栅极驱动输出钳制在16V以保护功率MOSFET。在JCXAC8513OCP中，对阈值斜率进行了内部优化，以在通用交流输入范围内达到恒定的输出功率极限。在图腾磁极栅极驱动输出端采用频率混叠技术和软开关控制，可获得优异的电磁干扰性能。在设计中，将低于20KHZ的音频能量降至最低，并在操作过程中消除音频噪声。
●扩展突发模式控制，提高效率和最小备用功率设计
●音频无噪音操作
●外部可编程脉宽调制开关频率
●内部同步坡度补偿
●低VDD启动电流（3μA）和低工作电流（1.8mA）
★外部可编程超温保护（OTP）
带或不带用于系统OVP的片上VDD OVP
带滞后的欠压闭锁（UVLO）
输出最大电压钳位（16V）
线路输入补偿循环过流阈值设置，用于在通用输入电压范围（OCP）内恒定输出电流限制。
★过载保护（OLP）
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[ CXAC8513 ]"
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产品概述 返回TOP
CXAC8513 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 CXAC8513. 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 subharmonic 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 and thus greatly reduces the external component count and system cost in the design. CXAC8513offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD over voltage clamp and under voltage lockout (UVLO). The Gate-drive output is clamped at 16V to protect the power MOSFET. In JCXAC8513OCP threshold slope is internally optimized to reach constant output power limit over universal AC input range. Excellent EMI performance is achieved with frequency shuffling technique together with soft switching control at the totem pole gate drive output. Tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.
产品特点 返回TOP
●Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design
●Audio Noise Free Operation
●External Programmable PWM Switching Frequency
●Internal Synchronized Slope Compensation
●Low VDD Startup Current (3μA) and Low Operating Current (1.8mA)
★External programmable over temperature protection (OTP)
★With or without On-chip VDD OVP for system OVP
★Under Voltage Lockout with Hysteresis (UVLO)
★Gate Output Maximum Voltage Clamp (16V)
★ Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting
For Constant Output current Limiting Over Universal Input Voltage Range(OCP).
★Over load Protection (OLP)
● Available in SOP8 and DIP8 package
应用范围 返回TOP
Offline AC/DC flyback converter for
Battery Charger
PC/TV/Set-Top Box Power Supplies
Laptop Power Adaptor
Open-frame SMPS
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产品封装图 返回TOP
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| Medium Power Controller(中等功率控制芯片) | |||||||||
| Part Number | Power | Standby | MODE | Freq | Accu | Freq Shuffling | OTP | OVP | Package |
| (80-265V) | (mW) | (Flyback) | (KHz) | ||||||
| CXAC85123 | 30W | ≤200 | PWM | 50-100/ADJ | ±1% | Y | A | A | SOT23-6 |
| CXAC8513 | 90W | ≤300 | PWM | 50-100/ADJ | ±1% | Y | A | A | SOP8 |
| CXAC8514 | 45W | ≤100 | PWM | 65 | ±1% | Y | L | L | SOT23-6 |
| CXAC8514A | 45W | ≤100 | PWM | 65 | ±1% | Y | A | A | SOT23-6 |
| CXAC8516 | 90W | ≤100 | QR | 90 | ±1% | N | A | A | SOP8 |
| CXAC8515 | 45W | ≤100 | PWM | 65 | ±1% | Y | A | A | SOT23-6 |
| L:Latch; A:Auto-recovery | |||||||||
