CXAC8514 CXAC8514A是一款高度集成的电流模式PWM控制芯片，针对40W～60W范围内的高性能、低待机功率（<100mW）和经济高效的离线反激变换器应用进行了优化。CXAC8514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）、CS短路保护、过载保护（OLP）、VDD欠压锁定（UVLO）和闩锁功能，包括过温保护（OTP）、过电压保护（固定或可调）。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。
●开机软启动降低MOSFET VDS应力
●EMI频率洗牌
●音频无噪音操作
●扩展突发模式控制，提高效率和最小备用功率设计
●内部同步坡度补偿
固定65KHz开关频率（CXAC8514、CXAC8514B）
固定100KHz开关频率（CXAC8514C）
●具有自动恢复功能的良好保护范围
＊带滞后的VDD欠压闭锁（UVLO）
＊带闩锁关闭（8204）或自动恢复（CXAC8514B、CXAC8514C）的过热保护（OTP）
＊通用输入电压范围内恒输出功率限制的逐周过电流阈值设置
＊带自动恢复的过载保护（OLP）
＊带闩锁关闭（8204）或自动恢复（CXAC8514B.CXAC8514C）的VDD过压保护（OVP）
[ CXAC8514 ]
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产品概述 返回TOP
CXAC8514 CXAC8514A is a highly integrated current mode PWM control IC optimized for high performance, low standby power (<100mW) and cost effective offline flyback converter applications in 40W～60W range. CXAC8514 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), CS short protection, over load protection (OLP), and VDD under voltage lockout (UVLO) and latch feature including over temperature protection (OTP), over voltage (fixed or adjustable) protection(OVP). 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
●Power on Soft Start Reducing MOSFET VDS Stress
●Frequency shuffling for EMI
●Audio Noise Free Operation
●Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design
●Internal Synchronized Slope Compensation
●Fixed 65KHz Switching Frequency (CXAC8514, CXAC8514B)
●Fixed 100KHz Switching Frequency (CXAC8514C)
●Good protection coverage with auto self-recovery
﹡ VDD Under Voltage Lockout with Hysteresis (UVLO)
﹡Over Temperature Protection (OTP) with latch shut down(8204) or auto-recovery(CXAC8514B,CXAC8514C)
﹡Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range
﹡Overload Protection (OLP) with auto-recovery
﹡VDD Over voltage Protection(OVP) with latch shut down(8204) or auto-recovery(CXAC8514B.CXAC8514C)
﹡Adjustable OVP through external Zener
﹡CS floating protection with auto-recovery
﹡CS short protection with auto-recovery
应用范围 返回TOP
Offline AC/DC flyback converter for
z AC/DC adapter
z PDA power supplies
z Digital cameras and camcorder adapter
z VCR,SVR, STB, DVD&DVCD player SMPS
z Set-top box power
z Auxiliary power supply for PC and server
z Open-frame SMPS
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Medium Power Controller(中等功率控制芯片) |
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Part Number |
Power |
Standby |
MODE |
Freq |
Accu |
Freq Shuffling |
OTP |
OVP |
Package |
|
(80-265V) |
(mW) |
(Flyback) |
(KHz) |
||||||
|
30W |
≤200 |
PWM |
50-100/ADJ |
±1% |
Y |
A |
A |
SOT23-6 |
|
|
90W |
≤300 |
PWM |
50-100/ADJ |
±1% |
Y |
A |
A |
SOP8 |
|
|
45W |
≤100 |
PWM |
65 |
±1% |
Y |
L |
L |
SOT23-6 |
|
|
45W |
≤100 |
PWM |
65 |
±1% |
Y |
A |
A |
SOT23-6 |
|
|
90W |
≤100 |
QR |
90 |
±1% |
N |
A |
A |
SOP8 |
|
|
45W |
≤100 |
PWM |
65 |
±1% |
Y |
A |
A |
SOT23-6 |
|
|
L:Latch; A:Auto-recovery |
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