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关键字：采用Lnk304pn的LED 220V照明灯
采用Lnk304pn的LED 220V照明灯
LNK304特别用来替代输出电流小于360mA的所有线性及电容降压式非隔离电源。其系统成本与所替代的电源相等，但性能更好、效率更高。
LNK304在一片IC上面集成了一个700 V的功率MOSFET、振荡器、简单的开/关控制电路、高压开关电流源、频率调制、逐周期的电流限制及过温保护电路。器件在启动及工作期间的功率消耗直接由漏极引脚的电压来提供，因此在BUCK及反激式转换器中可节省偏置供电的相关电路。在LNK304器件中完全集成的自动重启动电路在短路、开环的故障情况下，安全地限制了输出功率，减少了元器件的数目，降低了在系统级用于负载保护电路的成本。如有必要，IC的自供电操作允许使用没有安规要求的光耦器作为电平转换，以改善输入电压调整率及负载调整率。
替代线性及电容降压式电源的低成本解决方案
成本最低、元件数目最少的降压型(BUCK)转换器方案
完全集成的自动重启动功能，用于短路及开环故障保护
节省了外围元件的成本
具有精确的限流点且工作在66 kHz
可使用普通的1 mH 电感达到120 mA的输出电流
严格的参数公差与微小的可以忽略不计的温度漂移
高达700 V的击穿电压提供了良好的抵抗输入浪涌的能力
频率调制技术极大地降低了EMI(～10 dB)
降低了EMI滤波器的成本
很高的过温关断保护点(最小+135℃)
与分立元件的降压型或无源元件电源方案相比
具备更好的特性
支持降压(Buck)、降压－升压(Buck－Boost)及反激拓扑结构
提供系统级的过热、输出短路及控制环开路保护
既使采用典型的电路结构也可达到优秀的输入及负载调整率
高带宽提供了无过冲的快速启动
限流工作方式抑制了线电压的纹波
输入电压范围(85 VAC至265 VAC)
内置的限流点及具备迟滞特性的过热保护
与无源元件电源方案相比效率更高
相对于电容降压式方案其功率因数更高
可以完全实现电源的SMD生产
LNK304基本参数
输出电压 12V
频率范围 62～70kHz
工作温度 -40℃～150℃
隔离输出 —
LNK304电流输出
230 VAC ±15% MDCM 120mA
CCM 170mA
85-265 VAC MDCM 120mA
CCM 170mA
LNK304封装类型
P(DIP-8B)
G(SMD-8B)
D(SO-8C)
LNK304 应用
· 用于非隔离降压或升降压转换器,对线性/无源解决方案进行替换
· LED驱动及工业控制
· 大型和小型家用设备
· 电表﹑定时器
· 恒流发光二极管照明设备
google translate
LNK304 particular output current less than 360mA to replace all linear and non-isolated power supply capacitor buck. Replaced the system cost and power are equal, but better performance and higher efficiency.
LNK304 above in an IC integrates a 700 V power MOSFET, oscillator, simple on / off control circuit, high voltage switched current source, frequency modulation, by-cycle current limiting and over temperature protection circuit. Devices during the startup and power consumption directly from the drain pin of the voltage to provide, so BUCK and flyback converters can save the relevant circuit bias supply. In LNK304 devices fully integrated auto-restart circuit in short circuit, open loop fault conditions, the safety limits the output power, reducing the number of components, reduces system level cost for the load protection circuit. If necessary, IC self-powered operation allows the use of no safety and regulatory requirements of the coupler device as a level change, in order to improve voltage regulation and load regulation.
Alternative Capacitor Buck linear and low-cost solution
The lowest cost, lowest component count buck (BUCK) converter program
The fully integrated auto-restart function, for short circuit and open loop fault protection
Saves the cost of external components
Limit point with precision and work in the 66 kHz
Can use ordinary 1 mH inductor to 120 mA of output current
The strict parameters of tolerance and negligible small temperature drift
Up to 700 V breakdown voltage provides a good ability to resist input surge
Frequency modulation technology significantly reduces EMI (~ 10 dB)
Reduces EMI filter costs
High point of over-temperature shutdown protection (minimum +135 ℃)
With discrete components or passive components buck compared to the power program
With better features
Support the step-down (Buck), buck - boost (Buck-Boost) and flyback topologies
Provide system-level thermal, output short circuit protection and control open loop
Even the structure of a typical circuit can achieve excellent input and load regulation
Provide high-bandwidth fast overshoot-free start
Work limit line voltage ripple suppressed
Input voltage range (85 VAC to 265 VAC)
Built-in current limit point and thermal protection with hysteresis characteristics
Compared with the passive components more efficient power supply options
Relative to the capacitive power factor buck program higher
SMD power supply can be fully realized production
LNK304 basic parameters
Output voltage 12V
Frequency range of 62 ~ 70kHz
Operating temperature -40 ℃ ~ 150 ℃
Isolated Output -
LNK304 current output
230 VAC ± 15% MDCM 120mA
CCM 170mA
85-265 VAC MDCM 120mA
CCM 170mA
LNK304 Package Type
P (DIP-8B)
G (SMD-8B)
D (SO-8C)
LNK304 Applications
* For non-isolated step-down or buck converter, the linear / passive solution replacement
· LED drivers and industrial control
* Large and small home appliances
* ﹑ Timer meter
* Constant current LED lighting
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